CompTIAAssociate levelN10-009

N10-009 exam dumps: 329 free CompTIA Network+ practice questions

Free N10-009 practice questions for the Network+ exam, with the correct answer and a full explanation for every option. Read the first 10 below, browse all 329 by number, or take a timed practice exam.

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Free N10-009 practice questions

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N10-009 Question 1

Single answer1.1 Explain concepts related to the Open Systems Interconnection (OSI) reference model.

A network administrator is troubleshooting a problem in a small office after replacing an unmanaged switch with a managed switch. Users report that they can access printers and file shares within the local VLAN, but they cannot reach websites by name. When the administrator tests from a workstation, pinging the default gateway by IP address succeeds, and pinging a public IP address also succeeds. However, pinging a website FQDN fails. Based on the OSI model, at which layer is the problem most likely occurring?

  1. A

    Layer 3 - Network

  2. B

    Layer 4 - Transport

  3. C

    Layer 7 - Application

  4. D

    Layer 1 - Physical

Show answer and explanation

Correct answer: C

Explanation

This scenario is a classic example of using the OSI model to isolate a fault domain. Because the client can reach the default gateway and a public IP address, Layers 1 through 3 are demonstrably operational. The inability to reach a website by fully qualified domain name points to DNS resolution, which Network+ commonly associates with the Application layer (Layer 7) when mapping services to the OSI model. In practice, DNS uses UDP port 53 and sometimes TCP port 53, but exam objectives typically emphasize the service role rather than only the transport protocol. This layered troubleshooting approach aligns with standard networking best practices: verify physical connectivity first, then local IP configuration, then routed connectivity, and finally higher-layer services such as DNS.

  • A. Incorrect.

    Incorrect. Layer 3 is responsible for logical addressing and routing, such as IP and default gateway communication. Because the workstation can successfully ping both its default gateway and a public IP address, Layer 3 connectivity is functioning. A candidate might choose this option because routing issues are common after switch changes, but the successful IP-based tests indicate the network layer is not the primary problem.

  • B. Incorrect.

    Incorrect. Layer 4 handles end-to-end transport services such as TCP and UDP. While DNS commonly uses UDP and sometimes TCP, the scenario specifically points to successful connectivity by IP address but failure when using hostnames. That indicates name resolution rather than a general transport-layer failure. Someone might select this because DNS traffic uses transport-layer protocols, but the service issue itself is typically classified higher in the OSI model on Network+ exams.

  • C. Correct.

    Correct. Layer 7 includes application services such as DNS, which translates hostnames to IP addresses. The workstation can communicate locally and externally by IP, so basic physical, data link, network, and likely transport connectivity are working. The failure only occurs when using an FQDN, which strongly indicates a DNS/name-resolution issue at the application layer.

  • D. Incorrect.

    Incorrect. Layer 1 involves the physical medium, signaling, cabling, and link lights. If Layer 1 were the issue, the workstation would not be expected to reach the default gateway or a public IP address successfully. A user might pick this option because the problem started after a hardware replacement, but the evidence shows physical connectivity is intact.

N10-009 Question 2

Single answer1.1 Explain concepts related to the Open Systems Interconnection (OSI) reference model.

A network administrator is troubleshooting a problem in a warehouse. Several handheld devices can join the corporate Wi-Fi network and receive valid IP addresses from DHCP, but they cannot open the inventory application hosted on a remote server. The administrator successfully pings the default gateway from a handheld device, but a TCP connection test to the application server on port 443 fails. Based on the OSI model, which layer should the administrator investigate first?

  1. A

    Layer 2, because successful Wi-Fi association confirms the issue is with framing and MAC addressing

  2. B

    Layer 3, because DHCP and gateway reachability indicate IP addressing is the only remaining problem

  3. C

    Layer 4, because IP connectivity exists but the session to the application's TCP port cannot be established

  4. D

    Layer 7, because the inventory application is not opening, so the problem must be with the application itself

Show answer and explanation

Correct answer: C

Explanation

This scenario follows a practical OSI-based troubleshooting approach: start with the evidence and identify the highest confirmed working layer. The devices associate to Wi-Fi and obtain DHCP addresses, showing Layers 1 through 3 are at least partially operational. The administrator can also ping the default gateway, further supporting local IP connectivity. However, the failure to establish a TCP connection to port 443 points most directly to Layer 4, where TCP handles connection setup and port-based communication. In real environments, this commonly leads administrators to check host firewalls, network firewalls, ACLs, load balancers, or whether the server process is listening on the expected port. This aligns with standard troubleshooting practices described in CompTIA Network+ objectives and common vendor documentation from Cisco and Microsoft, which emphasize isolating faults by OSI layer and using protocol-specific tests such as ping for Layer 3 reachability and TCP port tests for Layer 4 validation.

  • A. Incorrect.

    Incorrect. Layer 2 covers local link functions such as framing, MAC addressing, and wireless association. In this scenario, the devices are already joining Wi-Fi and obtaining network access, which suggests Layer 2 is functioning sufficiently for communication on the local segment. A candidate might choose this if they associate Wi-Fi problems with Layer 2 by default, but the evidence points higher in the stack.

  • B. Incorrect.

    Incorrect. Layer 3 is responsible for logical addressing and routing. The handheld device receives a valid IP address via DHCP and can ping the default gateway, which indicates basic Layer 3 connectivity on the local network is working. While Layer 3 issues beyond the gateway could still exist in some cases, the failed TCP connection to port 443 more directly points to transport-level troubleshooting first.

  • C. Correct.

    Correct. Layer 4, the Transport layer, is responsible for end-to-end communications using protocols such as TCP and UDP, including port numbers and connection establishment. Because the device has basic network connectivity but cannot establish a TCP connection to the server's HTTPS port, the administrator should first investigate Layer 4 issues such as blocked ports, ACLs, firewall rules, or a service not listening on the expected port.

  • D. Incorrect.

    Incorrect. Layer 7 involves application services and interfaces, and an application fault is possible in some outages. However, the failed TCP connection test to port 443 indicates the problem occurs before normal application-layer communication can even begin. A candidate might select this because users report that the app will not open, but the test results narrow the issue to transport connectivity first.

N10-009 Question 3

Single answerLayer 1 - Physical

A technician is asked to extend network connectivity from a switch in one building to a small office in another building approximately 180 meters (590 feet) away. The path between the buildings runs alongside a parking lot with large electric motors and lighting equipment, and the area is prone to thunderstorms. The office needs a reliable 1 Gbps connection. Which of the following is the BEST Layer 1 solution?

  1. A

    Install Cat 6 UTP between the buildings because 1 Gbps Ethernet is supported on copper

  2. B

    Install single-mode or multimode fiber between the buildings with appropriate transceivers

  3. C

    Install Cat 5e STP between the buildings and bond the shielding at both ends

  4. D

    Install a copper Ethernet run with a PoE injector to overcome the distance limitation

Show answer and explanation

Correct answer: B

Explanation

For Network+ physical-layer scenarios, the best practice for interbuilding cabling is typically fiber optic cable rather than copper, especially when the distance exceeds 100 meters or when there is significant electromagnetic interference, lightning risk, or possible ground potential differences between buildings. TIA/EIA structured cabling guidance and Ethernet standards support the 100-meter maximum for twisted-pair Ethernet channels, while fiber is commonly recommended for campus and building-to-building backbone links. In this scenario, fiber meets the 1 Gbps requirement, avoids EMI from nearby electrical equipment, and provides electrical isolation that copper cannot.

  • A. Incorrect.

    This is incorrect. Although 1000BASE-T can run at 1 Gbps over copper, standard twisted-pair Ethernet has a maximum horizontal channel length of 100 meters. A 180-meter run exceeds Ethernet copper specifications. In addition, copper between buildings is vulnerable to electromagnetic interference and electrical potential differences, especially in areas with lightning exposure.

  • B. Correct.

    This is correct. Fiber optic cabling is the best physical-layer solution for an interbuilding link at 180 meters requiring 1 Gbps. Fiber easily supports this distance, is immune to electromagnetic interference from motors and lighting equipment, and does not conduct electricity, which helps protect against lightning-related surges and grounding issues between buildings. Either multimode or single-mode fiber could support 1 Gbps at this distance, depending on the chosen optics and design standards.

  • C. Incorrect.

    This is incorrect. Shielded twisted pair can reduce the effects of electromagnetic interference, but it does not solve the 100-meter Ethernet distance limit for copper. It also remains a conductive medium, so it is still a poor choice for building-to-building runs where lightning and grounding differences are concerns. Some candidates choose this because STP sounds like the right answer for EMI, but the distance and surge risk make it unsuitable here.

  • D. Incorrect.

    This is incorrect. PoE injectors provide power over Ethernet; they do not extend standard Ethernet data distance beyond the physical-layer limit for twisted-pair cabling. Copper would still exceed the supported length at 180 meters and would still be susceptible to interference and electrical hazards in this environment.

N10-009 Question 4

Single answerLayer 2 - Data link

A network administrator is troubleshooting intermittent connectivity between two departments connected through managed switches. Users in both departments can reach servers on their own VLANs, but devices in VLAN 20 on one switch cannot consistently communicate with devices in VLAN 20 on another switch. Devices in VLAN 10 work normally across the same uplink. The administrator confirms that routing is functioning and that the uplink between switches is physically up. Which of the following is the MOST likely cause?

  1. A

    The trunk link between the switches is not permitting VLAN 20

  2. B

    The default gateway for VLAN 20 is configured with the wrong subnet mask

  3. C

    A DNS server for VLAN 20 is unreachable

  4. D

    The switches are using different STP bridge priorities

Show answer and explanation

Correct answer: A

Explanation

This scenario focuses on a Layer 2 data link issue involving VLAN tagging and trunking between switches. When one VLAN works across a switch uplink and another does not, the best first suspicion is trunk misconfiguration, especially the allowed VLAN list or VLAN tagging mismatch. On IEEE 802.1Q trunks, each VLAN must be permitted across the trunk for its frames to traverse the link. Because VLAN 10 is functioning, the physical link and basic trunk operation are likely intact. Because routing is confirmed to be working, Layer 3 causes are less likely. Network+ candidates should recognize this as a practical troubleshooting pattern: isolate whether the problem is physical, Layer 2, or Layer 3, then compare working and non-working VLANs. Best practices from enterprise switch documentation commonly recommend verifying trunk status, native VLAN settings, and allowed VLAN lists when troubleshooting inter-switch VLAN communication.

  • A. Correct.

    Correct. This is a classic Layer 2 trunking issue. If VLAN 10 traffic passes across the inter-switch uplink but VLAN 20 traffic does not, the most likely explanation is that VLAN 20 is missing from the allowed VLAN list on the trunk or the trunk is otherwise not carrying that VLAN. This would prevent frames tagged for VLAN 20 from traversing the uplink while allowing other VLANs, such as VLAN 10, to work normally.

  • B. Incorrect.

    Incorrect. A wrong subnet mask on the default gateway is a Layer 3 configuration problem. The scenario specifically indicates that routing has already been verified and that the issue affects communication for the same VLAN across switches, which points more directly to a Layer 2 transport problem than to IP gateway configuration.

  • C. Incorrect.

    Incorrect. DNS resolution problems affect name-to-IP lookups, not whether devices on the same VLAN can communicate at Layer 2 across a trunk. Even if DNS were unavailable, direct communication by IP would still be possible if the VLAN were correctly carried between switches.

  • D. Incorrect.

    Incorrect. Spanning Tree Protocol bridge priority differences are normal in switched environments and are used to influence root bridge selection. Different priorities by themselves would not specifically prevent only VLAN 20 from traversing the uplink while VLAN 10 continues to function. If STP were blocking the only path, the impact would more likely be broader or tied to topology changes rather than one missing VLAN.

N10-009 Question 5

Single answerLayer 2 - Data link

A network administrator is replacing an unmanaged switch with a managed switch in a small office. After the cutover, users in the Finance department report they can no longer reach their accounting server, but users in other departments remain connected to their own resources. The accounting server is connected to switch port 12 and Finance users are connected to ports 1-8. The administrator verifies link lights are on and all devices have valid IP addresses. On the old switch, all ports were effectively in the same broadcast domain. On the new switch, ports 1-8 are assigned to VLAN 20, but port 12 is still in the default VLAN. Which action would MOST likely restore connectivity?

  1. A

    Assign port 12 to VLAN 20 so the server and Finance user ports are in the same Layer 2 broadcast domain

  2. B

    Configure port 12 with a static IP address in the same subnet as the Finance users

  3. C

    Enable STP PortFast on ports 1-8 and port 12 to reduce forwarding delays

  4. D

    Replace the patch cable connected to port 12 because VLAN mismatches commonly indicate a physical layer fault

Show answer and explanation

Correct answer: A

Explanation

This question tests practical Layer 2 switching knowledge, specifically VLAN behavior on managed switches. A VLAN creates a separate broadcast domain, so devices in different VLANs cannot communicate directly at Layer 2 without a Layer 3 device performing inter-VLAN routing. In this scenario, Finance clients were moved to VLAN 20, while the accounting server remained in the default VLAN, isolating it from those users. The proper fix is to assign the server's access port to VLAN 20 if the design intends for the server to be in the same Layer 2 segment as Finance. This aligns with standard Ethernet switching behavior and common vendor documentation for access port VLAN configuration on managed switches.

  • A. Correct.

    Correct. VLANs are a Layer 2 segmentation mechanism that create separate broadcast domains on a switch. If Finance user ports are in VLAN 20 but the accounting server's port remains in the default VLAN, frames from the users will not reach the server at Layer 2 unless inter-VLAN routing is configured. Placing port 12 in VLAN 20 restores same-VLAN communication and is the most direct fix for this scenario.

  • B. Incorrect.

    Incorrect. End devices such as servers receive IP addresses on their NICs, not on switch ports. Also, the scenario points to a Layer 2 VLAN membership issue, not an IP addressing problem. Even if the server has a valid IP address in the correct subnet, a VLAN mismatch can still prevent communication because the devices are isolated in different Layer 2 domains.

  • C. Incorrect.

    Incorrect. PortFast helps access ports transition to forwarding state more quickly when connecting end devices, but it does not solve traffic isolation caused by different VLAN assignments. The symptoms described are persistent for one department and one server, which aligns with a VLAN configuration issue rather than STP convergence delay.

  • D. Incorrect.

    Incorrect. A bad cable could cause loss of link or intermittent physical connectivity, but the administrator already confirmed link lights are on. A VLAN mismatch is a logical Layer 2 configuration issue, not a cabling fault. Replacing the cable would be a plausible troubleshooting step in some cases, but it is not the most likely solution here.

N10-009 Question 6

Single answerLayer 3 - Network

A company has two IPv4 subnets connected by a router: 192.168.10.0/24 for the accounting department and 192.168.20.0/24 for the warehouse. Users in accounting can reach hosts in their own subnet and can ping the router interface at 192.168.10.1, but they cannot reach any devices in the warehouse subnet. A technician verifies that the router interface for the warehouse network is up and configured as 192.168.20.1/24. On an accounting PC, the IP configuration is 192.168.10.50/24 with a default gateway of 192.168.10.254. Which action is the BEST way to restore connectivity between the two subnets?

  1. A

    Change the accounting PC default gateway to 192.168.10.1

  2. B

    Change the accounting PC subnet mask to 255.255.0.0

  3. C

    Assign the warehouse router interface an address in the 192.168.10.0/24 subnet

  4. D

    Enable NAT on the router for traffic between the two internal subnets

Show answer and explanation

Correct answer: A

Explanation

This scenario tests practical Layer 3 troubleshooting. A host uses its subnet mask to determine whether a destination is local or remote. If the destination is remote, the host forwards the packet to its configured default gateway, which must be a router interface on the same local subnet. Here, the accounting PC is on 192.168.10.0/24, and the known router interface on that subnet is 192.168.10.1. Because the PC is configured with 192.168.10.254 instead, traffic for 192.168.20.0/24 is sent to the wrong gateway and cannot be routed correctly. Best practice for IPv4 inter-subnet communication is to configure each host with the correct local IP, subnet mask, and default gateway that points to the local router interface. This aligns with standard TCP/IP host routing behavior described in common networking references and vendor documentation such as Cisco and Microsoft TCP/IP configuration guidance.

  • A. Correct.

    Correct. For hosts to reach remote Layer 3 networks, their default gateway must be the IP address of the local router interface on the same subnet. The accounting PC is in 192.168.10.0/24, and the reachable router interface on that subnet is 192.168.10.1. Using 192.168.10.254 as the gateway would prevent proper forwarding unless a router interface actually existed at that address. Since the user can already ping 192.168.10.1, updating the default gateway to that address is the appropriate fix.

  • B. Incorrect.

    Incorrect. Changing the mask to 255.255.0.0 would make the host believe that 192.168.20.0 is part of the local network range, causing it to attempt direct Layer 2 delivery instead of sending traffic to a router. Because the warehouse hosts are actually on a different subnet and likely a different broadcast domain, this would not solve the routing problem and would create addressing issues.

  • C. Incorrect.

    Incorrect. Router interfaces that connect different networks must be in the correct subnet for each connected segment. The warehouse-side interface should remain in 192.168.20.0/24 so it can serve as the gateway for that subnet. Moving it into 192.168.10.0/24 would break the Layer 3 boundary and create an invalid design with overlapping interface addressing for separate segments.

  • D. Incorrect.

    Incorrect. NAT is not required for routing between two internal private subnets directly connected to the same router. NAT is typically used when translating between private and public addresses or between overlapping address spaces. The issue here is basic host gateway configuration, not address translation.

N10-009 Question 7

Single answerLayer 3 - Network

A network administrator is troubleshooting connectivity between two IPv4 subnets in a small branch office. Hosts on VLAN 10 (192.168.10.0/24) can reach their default gateway at 192.168.10.1, and hosts on VLAN 20 (192.168.20.0/24) can reach their default gateway at 192.168.20.1. However, users on VLAN 10 cannot access a file server at 192.168.20.50, and users on VLAN 20 cannot reach any devices on VLAN 10. The Layer 3 switch has SVIs configured for both VLANs, and the administrator confirms both interfaces are up/up. Which of the following is the MOST likely cause of the problem?

  1. A

    IP routing is disabled on the Layer 3 switch

  2. B

    The file server is using the wrong DNS server address

  3. C

    A duplex mismatch exists between the switch and the file server

  4. D

    The hosts in VLAN 10 need a default gateway in a different subnet

Show answer and explanation

Correct answer: A

Explanation

This question tests practical Layer 3 troubleshooting in an inter-VLAN routing scenario. When each VLAN can reach its own SVI but cannot communicate with other VLANs, one of the first checks is whether Layer 3 routing is actually enabled on the multilayer switch. Best practice when troubleshooting is to verify: 1) host IP configuration and subnet mask, 2) default gateway reachability, 3) SVI status, and 4) routing functionality between directly connected networks. Vendor documentation for multilayer switches commonly notes that creating VLAN interfaces alone does not automatically enable IPv4 routing between them; the device must be operating with Layer 3 forwarding enabled. This aligns with standard Network+ expectations for diagnosing Layer 3 connectivity issues.

  • A. Correct.

    Correct. On a multilayer switch, having SVIs configured and operational is not enough by itself to route traffic between VLANs. Inter-VLAN communication requires Layer 3 forwarding to be enabled, typically with an 'ip routing' command or equivalent platform feature. If hosts can reach their own default gateway but cannot reach devices in the other subnet, disabled IP routing is a very plausible root cause.

  • B. Incorrect.

    Incorrect. DNS configuration affects name resolution, not basic Layer 3 reachability by IP address. In this scenario, users cannot reach devices across subnets even when the destination is identified by its IPv4 address (192.168.20.50), so DNS is not the likely cause.

  • C. Incorrect.

    Incorrect. A duplex mismatch can cause poor performance, late collisions, frame errors, and intermittent connectivity on a specific link, but it would not typically prevent all hosts in one VLAN from reaching all devices in another subnet through otherwise healthy SVIs. The issue described is broader and points to a routing problem rather than a single access-port performance issue.

  • D. Incorrect.

    Incorrect. Hosts in VLAN 10 should use a default gateway within their own subnet, such as 192.168.10.1. A default gateway in a different subnet would be invalid for normal host configuration unless special mechanisms are in place. Since the hosts can already reach 192.168.10.1, their gateway placement appears correct.

N10-009 Question 8

Single answerLayer 4 - Transport

A company has deployed a voice-over-IP (VoIP) softphone application to remote users. After a firewall policy change, users can still log in to the VoIP service, but during calls they experience choppy audio and frequent dropouts. Packet captures show the signaling session establishes successfully, but the voice stream suffers when the network is congested. Which transport-layer change would MOST likely improve call quality while keeping the application behavior appropriate for real-time voice traffic?

  1. A

    Configure the voice media stream to use UDP instead of TCP

  2. B

    Force the softphone signaling and media traffic to use only TCP port 443

  3. C

    Enable larger TCP receive windows for the voice media stream

  4. D

    Require the voice application to retransmit lost audio packets until acknowledged

Show answer and explanation

Correct answer: A

Explanation

This question tests practical understanding of Layer 4 transport behavior. For real-time applications such as VoIP, the transport protocol choice directly affects latency, jitter, and packet recovery behavior. UDP is commonly used for voice media because it is connectionless and does not provide retransmission, sequencing enforcement, or acknowledgments like TCP. That makes it better suited for time-sensitive traffic where delayed packets degrade user experience. TCP is more appropriate for applications that require reliable, ordered delivery, such as file transfers or web content. In common VoIP designs, signaling may use TCP or UDP depending on the protocol and implementation, but the media path is typically carried over UDP. This aligns with IETF real-time media practices, including RTP running over UDP, and with Network+ best-practice distinctions between reliable transport and low-latency transport.

  • A. Correct.

    Correct. Real-time voice media is typically carried over UDP because UDP has lower overhead and does not wait for acknowledgments or retransmissions. For voice traffic, late packets are often as useless as lost packets, so avoiding TCP-style recovery behavior helps reduce latency and jitter. This is the transport-layer choice most aligned with maintaining call quality during congestion.

  • B. Incorrect.

    Incorrect. Although tunneling traffic over TCP 443 may help with firewall traversal, using TCP for real-time voice media can worsen performance because retransmissions, in-order delivery requirements, and congestion recovery can increase delay and jitter. The scenario already indicates signaling works; the issue is media quality under congestion.

  • C. Incorrect.

    Incorrect. TCP receive window tuning is relevant to TCP flow control, but it does not solve the core issue for real-time audio. Larger windows can improve throughput for bulk transfers, not interactive media that is sensitive to delay variation. Voice streams generally prioritize timely delivery over reliable retransmission.

  • D. Incorrect.

    Incorrect. Requiring retransmission and acknowledgment of lost audio packets introduces additional delay, which is harmful to conversational voice. This reflects a common misconception that reliability is always preferable. At the transport layer, real-time applications usually accept some packet loss rather than incur the latency caused by recovery mechanisms.

N10-009 Question 9

Single answerLayer 4 - Transport

A company is rolling out a cloud-based voice and video collaboration platform to several branch offices. Users report that during busy periods, calls connect successfully but audio becomes choppy and video freezes for a few seconds at a time. Network monitoring shows occasional packet loss and variable latency on the WAN links. The application team confirms the platform uses both TCP and UDP at the transport layer. Which protocol should the real-time media streams use to provide the best user experience under these conditions?

  1. A

    TCP, because retransmissions ensure missing voice and video packets are delivered in order

  2. B

    UDP, because low-latency delivery is typically preferred over retransmission delays for real-time traffic

  3. C

    TCP, because connection-oriented sessions automatically eliminate jitter on congested links

  4. D

    UDP, because it guarantees packet delivery while using less bandwidth than TCP

Show answer and explanation

Correct answer: B

Explanation

The best answer is UDP because real-time applications such as voice and video typically prioritize low latency over guaranteed delivery. At Layer 4, TCP and UDP serve different purposes: TCP provides reliable, ordered delivery with acknowledgments and retransmissions, while UDP provides connectionless, low-overhead transport without delivery guarantees. For interactive media, delayed packets are often useless by the time they arrive, so retransmission behavior can reduce quality rather than improve it. This is why technologies such as VoIP and many video conferencing platforms commonly use UDP for media streams, even if TCP may still be used elsewhere in the application stack for signaling, authentication, or session management. This approach is consistent with standard networking best practices and with the transport-layer behavior described in common references such as RFC 768 for UDP and RFC 9293 for TCP.

  • A. Incorrect.

    Incorrect. TCP provides reliability through sequencing, acknowledgments, flow control, and retransmissions, which is valuable for applications such as file transfers and web traffic. However, for real-time voice and video, waiting for lost packets to be retransmitted often introduces additional delay that degrades call quality more than simply losing a small amount of media traffic. This is a common misconception when people equate reliable delivery with better application performance in all cases.

  • B. Correct.

    Correct. UDP is commonly used for real-time media streams because it has lower overhead and does not wait for acknowledgments or retransmissions. In voice and video communications, timely delivery is usually more important than perfect delivery. Small amounts of packet loss are often preferable to the extra latency introduced by TCP recovery mechanisms. This aligns with common design practices for VoIP and video conferencing, where transport-layer efficiency supports acceptable quality under variable network conditions.

  • C. Incorrect.

    Incorrect. TCP is connection-oriented, but that does not mean it eliminates jitter. Jitter is variation in packet arrival times caused by network conditions such as congestion, queuing, and path changes. TCP may even worsen perceived performance for real-time applications because retransmissions and congestion control can add delay. Someone might choose this option by confusing session establishment and reliability with quality-of-service improvements.

  • D. Incorrect.

    Incorrect. UDP does not guarantee packet delivery, packet order, or error recovery. It is a connectionless transport protocol with minimal overhead. While UDP often uses less overhead than TCP, the statement is wrong because it incorrectly claims guaranteed delivery. This distractor targets the common misunderstanding that a lighter protocol can still provide the same reliability guarantees as TCP.

N10-009 Question 10

Single answerLayer 5 - Session

A company uses a terminal server environment where remote employees connect to an internal Windows application through Microsoft Remote Desktop Services. Users report that after brief WAN interruptions, their screens freeze and they must sign in again, losing unsaved work. Network monitoring shows that IP connectivity is usually restored within seconds, but the user session is not being resumed. Which action would best address this issue from an OSI Layer 5 perspective?

  1. A

    Configure session persistence and reconnection settings on the Remote Desktop Services host

  2. B

    Replace the access switches with models that support a larger MAC address table

  3. C

    Disable TCP window scaling on client devices

  4. D

    Change the cabling between the core switch and firewall from Cat 6 to fiber

Show answer and explanation

Correct answer: A

Explanation

This question focuses on the OSI Session layer's role in maintaining dialog state between applications. In real environments, technologies such as Microsoft Remote Desktop Services rely on session management features to let users reconnect to an existing session after transient network loss. When users must sign in again and lose unsaved work even though connectivity returns quickly, the most appropriate fix is to review session timeout, disconnection, and reconnection settings rather than changing switching hardware, cabling, or TCP tuning. This aligns with common vendor guidance for remote application delivery platforms, where preserving user context across short interruptions is handled through session management and reconnection policies rather than lower-layer network changes.

  • A. Correct.

    Correct. OSI Layer 5, the Session layer, is responsible for establishing, managing, and terminating communication sessions between applications. In a Remote Desktop Services environment, configuring disconnected session limits, session persistence, and reconnection behavior directly addresses the problem of users needing to reauthenticate and losing application state after a brief interruption. This is the option that most closely maps to session management rather than lower-layer connectivity changes.

  • B. Incorrect.

    Incorrect. A larger MAC address table is a Layer 2 switching consideration and would be relevant for issues such as MAC flooding or address learning limits. It does not address the application session being dropped after a temporary WAN interruption.

  • C. Incorrect.

    Incorrect. TCP window scaling is a transport-layer performance feature related to throughput and receive window size. While transport issues can affect responsiveness, disabling window scaling would not be the best solution for preserving and resuming authenticated user sessions after a short disconnect.

  • D. Incorrect.

    Incorrect. Changing copper cabling to fiber between infrastructure devices affects the Physical layer and possibly bandwidth or distance limitations. The scenario already states that IP connectivity returns quickly, so the primary issue is session continuity, not the medium used for the uplink.

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What the N10-009 exam covers

Official Network+ exam domains and weightings.

  • Networking Fundamentals

    24% of exam

  • Network Implementations

    19% of exam

  • Network Operations

    16% of exam

  • Network Security

    19% of exam

  • Network Troubleshooting

    22% of exam

All 329 N10-009 practice questions

Every question has a page with the answer and explanation. Numbers are stable, so you can bookmark or share them.

  1. 1.A network administrator is troubleshooting a problem in a small office after replacing an unmanaged switch...
  2. 2.A network administrator is troubleshooting a problem in a warehouse. Several handheld devices can join the...
  3. 3.A technician is asked to extend network connectivity from a switch in one building to a small office in...
  4. 4.A network administrator is troubleshooting intermittent connectivity between two departments connected...
  5. 5.A network administrator is replacing an unmanaged switch with a managed switch in a small office. After the...
  6. 6.A company has two IPv4 subnets connected by a router: 192.168.10.0/24 for the accounting department and...
  7. 7.A network administrator is troubleshooting connectivity between two IPv4 subnets in a small branch office....
  8. 8.A company has deployed a voice-over-IP (VoIP) softphone application to remote users. After a firewall policy...
  9. 9.A company is rolling out a cloud-based voice and video collaboration platform to several branch offices....
  10. 10.A company uses a terminal server environment where remote employees connect to an internal Windows...
  11. 11.A company uses a remote application server that employees access through a terminal services client. Users...
  12. 12.A company has migrated a customer-facing web application to a new platform. Users can establish HTTPS...
  13. 13.A company has deployed a new web application over HTTPS. Users can reach the server and complete the TCP...
  14. 14.A company hosts an internal web application for employee expense reporting. Users can reach the site by IP...
  15. 15.A company hosts an internal web application for inventory management. Users report that they can reach the...
  16. 16.A company hosts a customer-facing web application in its data center. During seasonal sales, traffic...
  17. 17.A company hosts a public e-commerce website in its data center. During seasonal sales, the web application...
  18. 18.A company is moving a customer-facing web application from a single physical server to multiple virtual web...
  19. 19.A company hosts a customer-facing web application on four identical virtual servers in its data center....
  20. 20.A company launches a new product and sees a sudden spike in traffic to its public website from users around...
  21. 21.An e-commerce company is preparing for a nationwide product launch and expects a sharp increase in web...
  22. 22.A company has deployed a site-to-site VPN between its headquarters and a branch office so employees can use a...
  23. 23.A company has deployed a site-to-site VPN between its headquarters and a branch office so employees can use a...
  24. 24.A company has deployed 35 lightweight wireless access points across three floors of an office. The APs are...
  25. 25.A company has deployed 35 wireless access points across three floors of an office building. Users report that...
  26. 26.A company is migrating a latency-sensitive inventory application from its on-premises data center to a public...
  27. 27.A company is moving a payroll application to a public cloud provider but must keep its on-premises HR...
  28. 28.A company is opening several small branch offices and wants to reduce the cost and delay of shipping...
  29. 29.A company is opening several small branch offices and wants to reduce the cost and time required to deploy...
  30. 30.A company deploys a new payroll application in a virtual private cloud (VPC). The web servers are placed in a...
  31. 31.A company has moved a web application into a virtual private cloud (VPC). The application uses two subnets: a...
  32. 32.A company hosts a three-tier application in a cloud environment. The web servers are in a public subnet, the...
  33. 33.A company hosts a web application in a cloud environment. The web server VM is associated with a network...
  34. 34.A network administrator is hardening a perimeter router that connects the internal 10.20.30.0/24 subnet to...
  35. 35.A network administrator is hardening traffic between subnets by applying an IPv4 ACL on the router interface...
  36. 36.A company deploys a new cloud-based application in a virtual private network. The web servers are placed in a...
  37. 37.A company deploys a three-tier application in a public cloud. Web servers are placed in a public subnet, and...
  38. 38.A company is migrating a latency-sensitive financial application to a public cloud provider. The application...
  39. 39.A company is migrating a latency-sensitive ERP system to a public cloud provider. The system transfers large...
  40. 40.A company is launching a customer portal and wants to minimize the time its network team spends maintaining...
  41. 41.A company is moving a customer-facing web application to the cloud. The development team wants the cloud...
  42. 42.A company is migrating its customer portal to a public cloud provider. During monthly billing cycles, portal...
  43. 43.A company is migrating its customer-facing web application from an on-premises data center to a public cloud...
  44. 44.A mid-sized healthcare company wants to modernize its infrastructure. Patient records and imaging systems...
  45. 45.A healthcare company wants to modernize its infrastructure. Patient records and imaging systems must remain...
  46. 46.A systems administrator is deploying a secure email solution for remote users. The company requires users to...
  47. 47.A network administrator is migrating a branch office from an on-premises email server to a cloud-based...
  48. 48.A systems administrator has moved a branch office file transfer process from legacy FTP to a more secure...
  49. 49.A company migrates its email security gateway to a new cloud service. After the cutover, internal users can...
  50. 50.A network administrator deploys a new firewall in front of an internal FTP server. Remote users report that...
  51. 51.A network administrator deploys a new perimeter firewall and soon receives complaints that users can connect...
  52. 52.A network administrator is migrating a vendor file exchange process from FTP to a more secure method. The...
  53. 53.A systems administrator must allow a third-party vendor to securely upload nightly billing files to a Linux...
  54. 54.A network administrator is troubleshooting a legacy managed switch that only supports remote administration...
  55. 55.A network administrator is troubleshooting remote access to a legacy router in a lab environment. The...
  56. 56.A company hosts its own email server in a small data center. Internal users can send messages to each other,...
  57. 57.A company hosts its own email server in the data center and recently changed its edge firewall rules. After...
  58. 58.A company migrated several internal applications to new servers over the weekend. On Monday, users report...
  59. 59.A company recently migrated its public website to a new hosting provider. Users report that they can reach...
  60. 60.A network administrator installs a new DHCP server for a small branch office. After the change, users report...
  61. 61.A network administrator deploys a new DHCP server for a branch office. After the change, users on the local...
  62. 62.A network administrator is deploying several new IP phones that must download their boot configuration from a...
  63. 63.A network administrator is staging several new switches in a lab and wants them to download a boot image from...
  64. 64.A help desk team reports that users on the internal network can successfully browse secure websites, but they...
  65. 65.A help desk technician reports that users on the internal network cannot load the company intranet site by...
  66. 66.A systems administrator notices that Kerberos authentication is intermittently failing for remote users after...
  67. 67.A network administrator notices that domain member workstations at a branch office are showing certificate...
  68. 68.A network administrator deploys a monitoring server to collect interface utilization and device health...
  69. 69.A network administrator deploys a monitoring server to collect interface statistics and receive immediate...
  70. 70.A systems administrator deploys a new internal web application that authenticates users against the company's...
  71. 71.A network administrator is troubleshooting a new internal web application that authenticates users against...
  72. 72.A company hosts a customer portal on a web server in its DMZ. Users report they can browse the portal...
  73. 73.A company hosts a customer portal on a web server in a DMZ. Users report that they can reach the site with...
  74. 74.A systems administrator reports that users at a branch office cannot open shared folders on a file server at...
  75. 75.A systems administrator has migrated a department's shared files from an old server to a new Windows file...
  76. 76.A network administrator has configured several switches and firewalls to send logs to a centralized logging...
  77. 77.A network administrator deploys a centralized log server to collect messages from routers, switches, and...
  78. 78.A company is migrating users from an older email configuration to a more secure submission method for sending...
  79. 79.A company has migrated users to a new cloud email provider. After the change, users can receive email but...
  80. 80.A systems administrator is integrating a new HR application with the company's Active Directory for user...
  81. 81.A systems administrator is configuring a new identity-aware application to authenticate users against the...
  82. 82.A company migrates its customer database to a new Microsoft SQL Server hosted in a secure data center. After...
  83. 83.A company migrates its Microsoft SQL Server database to a new subnet behind an internal firewall. After the...
  84. 84.A systems administrator needs to remotely manage a Windows server at a branch office using Remote Desktop...
  85. 85.A systems administrator is trying to remotely manage a Windows server at a branch office from the corporate...
  86. 86.A company migrates its VoIP system to a new SIP provider. After the change, users can place calls internally,...
  87. 87.A company is migrating from a legacy VoIP deployment to a new hosted IP telephony service. After the cutover,...
  88. 88.A network administrator is deploying a site-to-site VPN between two branch offices using IPsec. The routers...
  89. 89.A network administrator is deploying a site-to-site VPN between two branch offices. The routers already...
  90. 90.A company is deploying a live video stream from a training server to 120 employees on the same campus...
  91. 91.A company is deploying a live training platform to 300 employees on the same campus network. During testing,...
  92. 92.A network administrator must connect a new switch in a warehouse to the main distribution switch in an office...
  93. 93.A company is expanding into a warehouse located 450 meters from the main office. The path between buildings...
  94. 94.A construction company is opening a temporary field office at a remote job site. The site has no wired ISP...
  95. 95.A construction company is deploying temporary network connectivity for a project site in a remote desert...
  96. 96.A network administrator is upgrading a data center row by adding a new top-of-rack switch. The switch must...
  97. 97.A network administrator is upgrading links in a data center. The new top-of-rack switch has several SFP+...
  98. 98.A company is expanding its data center and needs to connect two separate systems: a new 10 GbE top-of-rack...
  99. 99.A storage administrator is connecting a new Fibre Channel SAN switch to a server equipped with a dual-port...
  100. 100.A network administrator is upgrading the uplinks between a top-of-rack switch and a distribution switch in a...
  101. 101.A network administrator is upgrading the uplinks between a top-of-rack switch and the data center core. The...
  102. 102.A network technician is upgrading a data center link from several individual duplex fiber patch cables to a...
  103. 103.A network administrator is upgrading a data center link between two 40GbE switches. The new transceivers use...
  104. 104.A manufacturing company is renovating a large warehouse and needs to add network connectivity for handheld...
  105. 105.A manufacturing company is opening a temporary remote job site for 40 engineers and contractors. The site has...
  106. 106.A company is building a new virtualized data center for an internal private cloud. The environment will host...
  107. 107.A company is building a new virtualized data center to host hundreds of east-west traffic flows between...
  108. 108.A company is redesigning its campus network for a three-story office building using the three-tier...
  109. 109.A company is redesigning its campus network for three office floors. Users on each floor connect to local...
  110. 110.A company is moving into a new three-story office with about 120 employees. The network administrator wants a...
  111. 111.A company is moving into a new three-floor office with about 120 employees. The network administrator wants a...
  112. 112.A company hosts several application servers and database servers in its on-premises data center. Users from...
  113. 113.A company hosts a customer-facing web application in its data center. Users on the internet connect to a...
  114. 114.A network administrator is redesigning the addressing scheme for a branch office. The office has 5...
  115. 115.A network administrator is configuring a new IPv4 subnet for a branch office. The office has 50 employee...
  116. 116.A technician is troubleshooting a user workstation that cannot access internal file shares or the internet....
  117. 117.A technician is troubleshooting a user's Windows laptop that cannot access the company intranet or the...
  118. 118.A network administrator is redesigning addressing for a small campus using the 192.168.50.0/24 network. The...
  119. 119.A network administrator is assigned the CIDR block 10.20.40.0/24 for a new branch office. The office has...
  120. 120.A network administrator is reviewing firewall logs and notices traffic being sent to 239.1.1.1 during a video...
  121. 121.A network technician is reviewing firewall logs for a training lab after several students reported unusual...
  122. 122.A retail company is redesigning its network for a new group of small pop-up stores. Each site has only a...
  123. 123.A manufacturing company is deploying hundreds of wireless temperature and vibration sensors across a...
  124. 124.A retail company is replacing traditional branch routers with an SD-WAN solution across 60 stores. Each store...
  125. 125.A retail company is replacing traditional branch routers with an SD-WAN solution at 60 small stores. Each...
  126. 126.A company is connecting two data centers over an IP-based data center interconnect (DCI). Several legacy...
  127. 127.A company is expanding a private cloud across two data centers and must move several virtual machines between...
  128. 128.A company is replacing its traditional VPN with a zero trust architecture (ZTA) solution for internal web...
  129. 129.A company is replacing its legacy VPN with a zero trust architecture (ZTA) solution for internal web...
  130. 130.A company has moved most of its applications to SaaS platforms and now has a largely remote workforce. Users...
  131. 131.A company has moved most of its applications to SaaS platforms and now supports a large remote workforce....
  132. 132.A network operations team uses infrastructure as code to manage configurations on hundreds of branch routers...
  133. 133.A network team manages switch and router configurations across multiple branch offices using infrastructure...
  134. 134.A network operations team stores firewall policies, switch configurations, and router templates in a...
  135. 135.A network operations team stores router and firewall configuration templates in a Git-based central...
  136. 136.A company has exhausted its public IPv4 address space and is rolling out IPv6 across its internal network....
  137. 137.A company has run out of available IPv4 addresses for new client devices. The network team enables IPv6 on...
  138. 138.A company is merging two branch offices into its WAN. The network team wants routing to adapt automatically...
  139. 139.A company has a headquarters location and 18 branch offices connected over WAN links. The network team wants...
  140. 140.A small branch office has a single router connected to the headquarters router over a point-to-point WAN...
  141. 141.A network administrator connects a small branch office to headquarters using a single WAN router. The branch...
  142. 142.A midsize company has two internet connections: one to ISP-A and one to ISP-B. The company also runs OSPF...
  143. 143.A company is merging with another organization and needs to exchange route information between the two...
  144. 144.A branch office router has two paths to reach the 10.50.20.0/24 network. One path is a static route pointing...
  145. 145.A network administrator is troubleshooting why traffic from a branch office to the 10.50.20.0/24 server...
  146. 146.A small company has 45 employee workstations on a private IPv4 network using addresses in the 192.168.50.0/24...
  147. 147.A small company has 120 internal workstations using private IPv4 addresses. The ISP has provided only one...
  148. 148.A network administrator is configuring gateway redundancy for a user VLAN with two Layer 3 switches. Hosts on...
  149. 149.A network administrator is configuring two Layer 3 switches to provide gateway redundancy for users on VLAN...
  150. 150.A network administrator is troubleshooting connectivity between VLAN 10 and a remote branch office. The...
  151. 151.A network administrator is troubleshooting traffic from the 10.20.30.0/24 VLAN, which reaches other internal...
  152. 152.A network administrator is replacing an unmanaged switch in a small office with a managed Layer 2 switch. The...
  153. 153.A network administrator is replacing an unmanaged switch with a managed Layer 2 switch in a small office. The...
  154. 154.A network administrator creates VLAN 20 for the accounting department on a Layer 2 switch and assigns several...
  155. 155.A network administrator is deploying a new VLAN for the accounting department on a Layer 3 switch. Users in...
  156. 156.A network administrator is deploying new IP phones with built-in two-port switches so that each user's PC...
  157. 157.A network administrator is deploying IP phones with built-in PC pass-through ports on an access switch. Users...
  158. 158.A network administrator is upgrading wireless coverage in a crowded office that occupies one floor of a...
  159. 159.A healthcare clinic is expanding into a newly renovated wing where staff will use wireless tablets for access...
  160. 160.A network administrator is redesigning Wi-Fi in a European office that uses several 5 GHz access points....
  161. 161.A network administrator is troubleshooting poor Wi-Fi performance in a European office. The 2.4 GHz WLAN uses...
  162. 162.A network administrator is upgrading wireless access in a modern office. The environment includes older...
  163. 163.A company upgrades its office wireless network with new tri-band access points that support 2.4GHz, 5GHz, and...
  164. 164.A network administrator is troubleshooting Wi-Fi roaming issues in a warehouse. Three access points are...
  165. 165.A network administrator is troubleshooting roaming issues in a corporate office with three wireless access...
  166. 166.A construction company is deploying temporary network connectivity at a remote job site. There is no existing...
  167. 167.A construction company is deploying temporary network connectivity at a large outdoor job site. There is no...
  168. 168.A company is replacing its wireless infrastructure in a mixed-device environment. The security team wants the...
  169. 169.A company is upgrading its wireless network in a shared office building. The security team wants to reduce...
  170. 170.A hotel deploys a guest Wi-Fi SSID that uses a captive portal to require users to accept terms of service...
  171. 171.A hotel provides a guest Wi-Fi SSID that uses a captive portal to display the acceptable use policy and...
  172. 172.A company is replacing its single wireless password on the corporate SSID after discovering that several...
  173. 173.A company with 250 employees is replacing its office Wi-Fi. Management wants each employee to sign in with...
  174. 174.A network technician is asked to extend wireless connectivity from the main office building to a warehouse...
  175. 175.A network technician is asked to extend Wi-Fi from the main office to a detached warehouse located 250 meters...
  176. 176.A company is opening a temporary training facility with six wireless access points. The site has a small IT...
  177. 177.A company is moving from a single office with three standalone wireless access points to a new campus with 40...
  178. 178.A network technician is installing copper Ethernet cabling for several wall-mounted wireless access points in...
  179. 179.A network technician is installing copper Ethernet cabling for several desktop workstations in a...
  180. 180.A network administrator is upgrading a three-floor office building. The ISP demarcation point, edge router,...
  181. 181.A network administrator is upgrading access-layer switching in a three-story office building. The building...
  182. 182.A hospital is upgrading a wiring closet that contains copper terminations for office drops and fiber uplinks...
  183. 183.A hospital is renovating an IDF that serves several patient-care areas. The network administrator must reduce...
  184. 184.A network administrator is installing a new rack of equipment in a small server room. The rack will contain a...
  185. 185.A network administrator is adding two new PoE access switches to a small server room. The rack already...
  186. 186.A company has experienced two environmental incidents in its small server room over the last year. During the...
  187. 187.A company is converting a small office storage room into a network closet for switches, patch panels, and a...
  188. 188.A network administrator needs to upgrade firmware on several core switches during a planned maintenance...
  189. 189.A network administrator needs to replace a failed core switch in the middle of the business day. The...
  190. 190.A network administrator is troubleshooting a connectivity issue after a branch office move. Users can reach...
  191. 191.A network administrator is preparing for a weekend change window to replace a failed access switch in a...
  192. 192.A network administrator is preparing for a scheduled replacement of several aging access switches at a branch...
  193. 193.A network administrator is preparing for a planned replacement of several aging access switches across three...
  194. 194.A company is opening a new floor in its office and plans to support VoIP handsets, laptops, and barcode...
  195. 195.A company is opening a new floor in its office and has committed in a customer-facing SLA to provide at least...
  196. 196.A company is preparing for a security audit and discovers that several branch-office routers are still in...
  197. 197.A company is replacing several branch-office routers after the vendor announced the hardware is end-of-life...
  198. 198.A network administrator receives a request from the facilities team to activate two unused switch ports for...
  199. 199.A network administrator receives an email from the facilities manager asking for two new Ethernet drops to be...
  200. 200.A network administrator applied a security hardening update to a core switch late at night. The next morning,...
  201. 201.A network administrator is preparing to replace a failed access switch at a remote branch office. The...
  202. 202.A network administrator is troubleshooting intermittent slowness reported by users in a branch office. The...
  203. 203.A network administrator is troubleshooting intermittent slowness reported by users in a branch office. The...
  204. 204.A network administrator is deploying centralized monitoring for branch-office routers across an untrusted...
  205. 205.A network administrator is deploying a new monitoring platform to manage core switches across multiple sites....
  206. 206.A network administrator is investigating intermittent voice quality problems on a campus network. Users...
  207. 207.A network administrator is troubleshooting recurring complaints that a business-critical application becomes...
  208. 208.A network administrator is troubleshooting reports that users experience slow performance every weekday...
  209. 209.A network administrator enables anomaly-based alerting on a monitoring platform to detect unusual outbound...
  210. 210.A network administrator receives hundreds of security emails overnight from the organization's monitoring...
  211. 211.A network administrator is deploying centralized logging for routers, switches, Linux servers, and a...
  212. 212.A network administrator is deploying centralized logging for several routers, switches, and Linux servers....
  213. 213.A network administrator is integrating a cloud-based security monitoring platform with the company's...
  214. 214.A network administrator is integrating a cloud-based monitoring platform with an on-premises IDS. The...
  215. 215.A regional medical clinic is updating its disaster recovery plan for the network that supports electronic...
  216. 216.A regional medical clinic relies on a centralized scheduling application hosted in its primary data center....
  217. 217.A healthcare clinic is reviewing its disaster recovery plan for a patient scheduling application. Management...
  218. 218.A healthcare clinic is reviewing its disaster recovery plan for a patient scheduling system. Management...
  219. 219.A regional healthcare provider is updating its disaster recovery plan after a prolonged power failure shut...
  220. 220.A regional insurance company is updating its disaster recovery plan after a flood previously took its primary...
  221. 221.A company is deploying two edge firewalls to improve Internet availability for a customer portal. Management...
  222. 222.A company runs a customer-facing web application behind two load balancers in an active-active design. During...
  223. 223.A network administrator is helping prepare the organization for a possible ransomware incident that could...
  224. 224.A network administrator is helping prepare the company for a disaster recovery audit. Management wants to...
  225. 225.A company is migrating a branch office to IPv6 while keeping IPv4 available for legacy applications. The...
  226. 226.A company has enabled IPv6 on a new branch office LAN, but hosts are still receiving only link-local IPv6...
  227. 227.A company has centralized its DHCP service on a server in the data center. A new branch office subnet,...
  228. 228.A company has a centralized DHCP server in the data center for all branch offices. At one branch, users on...
  229. 229.A network administrator manages branch-office laptops that use the company firewall as their DNS resolver....
  230. 230.A network administrator is securing client DNS traffic for remote employees who often use untrusted public...
  231. 231.A company is moving its public-facing website to a new cloud platform. The DNS administrator wants users to...
  232. 232.A company is moving its public website from an on-premises server to a cloud-hosted platform. The DNS...
  233. 233.A company is migrating a public web application to a new IP address. During testing, users on the internal...
  234. 234.A network administrator is troubleshooting name resolution for an internal application server named...
  235. 235.A financial trading company is upgrading the timing design for two different environments. The first...
  236. 236.A manufacturing company is deploying high-speed robotics and industrial cameras on a converged Ethernet...
  237. 237.A network administrator needs to remotely manage branch office routers and switches across an untrusted WAN...
  238. 238.A network administrator needs to remotely manage branch-office routers and switches across an untrusted WAN....
  239. 239.A company has a headquarters office and a branch office that need constant encrypted connectivity between...
  240. 240.A company has a headquarters office and a branch office that both need постоянный, encrypted connectivity...
  241. 241.A network administrator is troubleshooting a core switch after a bad ACL change cut off remote access from...
  242. 242.A network administrator is deploying a new branch router at a site with no on-site IT staff. After a...
  243. 243.A company allows employees to connect personal smartphones and tablets to the corporate wireless network. The...
  244. 244.A company allows employees to connect personal smartphones and tablets to the corporate Wi-Fi for email and...
  245. 245.A company is deploying a new internal web application that stores employee tax documents on a file server....
  246. 246.A company is rolling out a new internal web application that employees will access from laptops on the...
  247. 247.A company is deploying centralized authentication for administrators who manage routers and switches from...
  248. 248.A company wants employees to use their existing corporate credentials to access a new cloud-based HR...
  249. 249.A company has technicians in the United States, Canada, and Europe who remotely administer branch-office...
  250. 250.A company allows employees to access an internal inventory application through a VPN. The network...
  251. 251.A network administrator discovers that an unlocked wiring closet in a shared office building contains patch...
  252. 252.A network administrator discovers that several employees have been entering the network closet without...
  253. 253.A security administrator wants to study how attackers probe the company's public-facing services without...
  254. 254.A security administrator wants to study how external attackers move laterally after gaining initial access,...
  255. 255.A hospital's IT team discovers that several internet-facing file transfer servers are still using an outdated...
  256. 256.A hospital's IT team discovers that a public-facing patient portal is running an outdated web application...
  257. 257.A retail company based in Germany is migrating its e-commerce platform to a public cloud provider. The...
  258. 258.A retail company based in Germany is migrating its e-commerce platform to a cloud provider. The environment...
  259. 259.A manufacturing company is modernizing its plant network. The environment includes SCADA servers, PLCs on an...
  260. 260.A manufacturing company is modernizing its network. The plant floor contains SCADA servers, PLCs, and other...
  261. 261.A network administrator notices that several internal users are being redirected to a fake payroll website...
  262. 262.A network administrator notices that several internal users are being redirected to a fake payroll website...
  263. 263.A company hosts a public e-commerce website in its on-premises data center. During a flash sale, users report...
  264. 264.A company hosts a public e-commerce website in its on-premises data center. During a flash sale, users begin...
  265. 265.A network administrator is investigating reports that users are intermittently redirected to a fake internal...
  266. 266.A network administrator is investigating reports that users can initially reach the company payroll website...
  267. 267.Users in a branch office report intermittent connectivity problems after a visitor was seen working in a...
  268. 268.Users in a branch office report that they can connect to a wireless network named CorpWiFi, but after...
  269. 269.A network administrator notices several unusual events in one week: a visitor followed an employee through a...
  270. 270.A network administrator notices that printed visitor logs, old network diagrams, and help desk notes with...
  271. 271.A network administrator notices that several user workstations are making repeated outbound DNS requests to...
  272. 272.A network administrator notices that several workstations are generating a high volume of outbound...
  273. 273.A company allows employees to connect their own laptops to unused wall ports in conference rooms. After a...
  274. 274.A company has deployed a guest Wi-Fi network in the lobby for visitors. The network team discovers that...
  275. 275.A company is tightening security in a conference room where employees, contractors, and visitors often...
  276. 276.A company is preparing for a security audit after discovering that an unauthorized laptop was plugged into an...
  277. 277.A company uses WPA2-Enterprise for employee laptops and phones, but the guest wireless network still uses...
  278. 278.A network administrator is deploying WPA3-Enterprise for a new corporate wireless network. The company wants...
  279. 279.A company allows its marketing team to access social media sites for business purposes, but the rest of the...
  280. 280.A company's security team must reduce web-based risk for office users without blocking general internet...
  281. 281.A company hosts its public web server and external DNS server on a separate network segment between the...
  282. 282.A company hosts a public web application and an external DNS server for customers. The security team wants to...
  283. 283.A network technician receives a report that users in one department cannot reach an internal file server. The...
  284. 284.A network technician is assigned to investigate intermittent connectivity complaints from users in one office...
  285. 285.Users in one department report that they intermittently lose access to a file server, while users in other...
  286. 286.A network technician is told that users in the accounting department cannot access a shared application...
  287. 287.Users in one office report that they can open websites by IP address, but they cannot reach any internal...
  288. 288.Users in one office report that they cannot access a newly deployed internal web application by URL from...
  289. 289.A network technician is troubleshooting reports that users in one office suite cannot reach a file server in...
  290. 290.A network technician is troubleshooting a report that users on the third floor cannot reach a newly installed...
  291. 291.A network administrator has confirmed that users in a remote branch office are intermittently losing access...
  292. 292.A network administrator confirms that users in a remote office lose access to internal applications several...
  293. 293.A network technician is troubleshooting intermittent connectivity for users in a small branch office. After...
  294. 294.A network technician is troubleshooting a small branch office that cannot reach a newly deployed cloud-based...
  295. 295.A network administrator replaced a failed access switch in a small branch office after hours. The new switch...
  296. 296.A network technician replaced a failed access switch in a small branch office after hours. The new switch has...
  297. 297.A network administrator resolves an intermittent connectivity issue affecting several users in a branch...
  298. 298.A network administrator resolves an intermittent VoIP quality issue affecting one branch office by...
  299. 299.A technician installs a new Cat 6 drop for a user's workstation. After connecting the PC to a switch port,...
  300. 300.A network technician installs a new Cat 6 horizontal cable run from a patch panel in the IDF to a user's wall...
  301. 301.A technician installs a new copper Ethernet run between a switch in a manufacturing area and a workstation 85...
  302. 302.A technician installs a new 10GBASE-T link between a core switch and a virtualization host in a manufacturing...
  303. 303.A network technician is troubleshooting poor performance on a file server connected to a switch access port....
  304. 304.A network administrator is troubleshooting poor application performance for users connected to a floor...
  305. 305.A network technician is troubleshooting user connectivity after replacing a desk phone and reconnecting the...
  306. 306.A network administrator replaces several office phones with new color-display VoIP phones and also adds two...
  307. 307.A network administrator replaces several office phones with new video-enabled VoIP phones and also installs...
  308. 308.Users in a branch office report that they can access internal file shares by IP address, but they cannot open...
  309. 309.Users in a branch office report that they can browse the internet by website name, but they cannot access the...
  310. 310.A technician adds a new access switch to an office network and connects it to two existing distribution...
  311. 311.A network administrator adds a new access switch to an office network. Shortly after installation, users on...
  312. 312.A network administrator is troubleshooting why a branch office file server at 10.20.30.50 cannot reach a...
  313. 313.A network administrator is troubleshooting why a workstation on 192.168.10.0/24 cannot reach an external SaaS...
  314. 314.A network technician is troubleshooting connectivity issues for users in a small office. All PCs should...
  315. 315.A network administrator receives several reports after deploying a new DHCP scope for the 192.168.50.0/24...
  316. 316.A network administrator receives complaints that users in one office suite experience very slow file...
  317. 317.A network administrator receives complaints that users in one office experience very slow file transfers to a...
  318. 318.A company has a 200 Mbps internet circuit shared by office users and a cloud-based call center. Every day at...
  319. 319.A company recently moved its customer support team to a cloud-based VoIP platform. During the afternoon,...
  320. 320.A network administrator is troubleshooting wireless issues on a corporate office floor with several access...
  321. 321.A company has deployed multiple wireless access points throughout a two-floor office to support VoIP handsets...
  322. 322.A network administrator receives reports that users in a branch office can reach internal resources by IP...
  323. 323.A network administrator is troubleshooting reports that users can reach internal web applications but cannot...
  324. 324.A network administrator is troubleshooting reports that users in a branch office can reach internet websites...
  325. 325.A systems administrator is troubleshooting why users on a Linux server cannot reach an internal web...
  326. 326.A network technician is troubleshooting a newly installed multimode fiber link between a wiring closet and a...
  327. 327.A network technician is troubleshooting a newly installed multimode fiber run between an access switch in a...
  328. 328.A technician is troubleshooting a report that a newly installed IP phone is not powering on when connected to...
  329. 329.A network technician is troubleshooting why a newly installed PoE security camera is not coming online after...

N10-009 exam dumps FAQ

Are these N10-009 dumps real exam questions?

No. These are original practice questions written to the Network+ exam objectives, not questions copied from a live exam. Memorising leaked questions violates CompTIA's candidate agreement and stops working the moment the question pool rotates. Use this bank to check your understanding of each domain and to find the topics you still need to study.

How many N10-009 practice questions are there?

329 questions, each with the correct answer, an explanation of the answer, and a note on why every other option is wrong. The first 10 are on this page and every question has its own page linked below.

Are the N10-009 exam dumps free?

Yes. Every question, answer and explanation on this page and the linked question pages is free to read without an account. A free HydraNode account adds timed practice exams, scoring and progress tracking across attempts.

How do I take a timed N10-009 practice test?

Sign in and start the Network+ exam on HydraNode. A session gives you 90 questions drawn from this bank in 90 minutes, then a score report with a per-question review.

What topics does the N10-009 exam cover?

The official exam domains are: Networking Fundamentals; Network Implementations; Network Operations; Network Security; Network Troubleshooting.

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