network+ practice test Practice Exam 2025: Latest Questions

A network technician is asked to ensure that a workstation automatically uses the correct default gateway, DNS servers, and IP address when connected to the corporate LAN. Which service should the technician verify is available on the network?

A technician must connect a new access switch to the distribution switch and ensure multiple VLANs can traverse the uplink. Which configuration is required on the uplink ports?

A security analyst wants to reduce the chance of unauthorized devices gaining access to a wired network by requiring a user/device authentication step before the switch grants network access. Which solution best meets this requirement?

Users report they can access internal resources by hostname, but external websites fail to resolve. Pinging a public IP address (for example, a known public DNS server) works. Which issue is the MOST likely cause?

A company has a single public IP address from its ISP but needs dozens of internal hosts to access the Internet simultaneously. Which technology should be implemented on the edge device?

A network engineer wants to provide dynamic routing between an on-premises site and a cloud environment over an encrypted tunnel. The engineer also wants the routing to automatically adjust if subnets are added later. Which approach BEST meets these requirements?

A NOC receives alerts that a core switch CPU is spiking intermittently. An engineer suspects a Layer 2 loop is occurring on an access segment. Which switch feature is MOST directly used to prevent loops from causing broadcast storms?

A wireless network uses a shared passphrase, and the security team wants to reduce risk if the passphrase is disclosed. They want each user to authenticate with unique credentials and centrally revoke access without changing the SSID password. Which solution is BEST?

A company uses OSPF internally. After a maintenance window, routes to a remote subnet are flapping between two paths, causing intermittent application timeouts. The engineer discovers two routers on the same link disagree about the OSPF network type and are not forming a stable adjacency. Which symptom MOST directly supports this diagnosis?

An organization is segmenting a data center network. The design requires (1) east-west micro-segmentation between workloads, (2) visibility into application-layer traffic for policy decisions, and (3) minimal reliance on IP addressing changes. Which technology BEST fits these requirements?

A technician needs to ensure a switch port will accept only a single, known device and automatically disable the port if a different MAC address is detected. Which feature should be configured?

A network engineer is asked to segment traffic for the Accounting department on an existing Layer 2 switch while using the same physical infrastructure as other departments. Which implementation best meets this requirement?

A junior administrator wants to view the hop-by-hop path and latency to a remote host to help isolate where delays are occurring. Which tool is the best choice?

A company is deploying wireless in a high-density auditorium. Users report frequent disconnects and poor performance during events. Which configuration change is most likely to improve performance in this scenario?

After a power outage, several access switches come online with a different configuration than expected. The team wants a centralized way to track configuration changes and quickly restore known-good configs. What is the BEST operational solution?

A company wants all DNS queries from branch users to be filtered to block known malicious domains, without installing software on endpoints. Which solution BEST meets this requirement?

A user reports they can ping hosts by IP address but cannot access internal resources by hostname. Other users are unaffected. Which is the MOST likely cause on the user's workstation?

A company needs redundancy between two switches connected by multiple physical links. They also want to prevent Layer 2 loops while using the combined bandwidth of the links. Which technology should be implemented?

A security analyst suspects an on-path attacker is intercepting traffic between clients and the default gateway on a local subnet. Users intermittently reach a fake login page. Which Layer 2 attack is MOST consistent with these symptoms?

A company runs a critical VoIP system. During peak usage, voice quality degrades even though overall link utilization is below 60%. The engineer suspects microbursts are causing queue drops on an uplink. Which troubleshooting approach is MOST appropriate to confirm this?

A network administrator wants to limit broadcast traffic on a flat Layer 2 network without adding new routers. Which change will accomplish this goal?

A help desk ticket reports that users can access internal resources by IP address but cannot access them by hostname. Which service is MOST likely causing the issue?

A company is deploying 802.1X on its wired network. Which component is responsible for validating user/device credentials and making the accept/deny decision?

A network engineer needs to ensure that voice traffic is prioritized over bulk data transfers on an access switch. Which QoS marking should be applied to voice payload traffic as a best practice?

A company enables LACP on a pair of switches to increase bandwidth between them. After the change, the bundled link is up but throughput is lower than expected when copying a single large file between two hosts. Which explanation BEST describes this behavior?