CCNA Practice Test: Test Your Knowledge 2025

A network administrator needs to segment a network into multiple broadcast domains to reduce network congestion. Which device should be implemented to achieve this requirement?

An engineer is troubleshooting connectivity issues and executes the command 'show ip interface brief' on a Cisco router. The output shows an interface status of 'up' for Layer 1 and 'down' for Layer 2. What is the most likely cause of this issue?

A company has been assigned the network address 192.168.100.0/24 and needs to create 6 subnets with at least 25 hosts per subnet. Which subnet mask should be used?

Which TCP/IP model layer is responsible for ensuring reliable, end-to-end communication and includes protocols such as TCP and UDP?

A network administrator configures a trunk port between two switches but VLANs are not passing traffic correctly. Which command should be used to verify the VLANs allowed on the trunk?

An organization wants to implement port security on access switches to prevent unauthorized devices from connecting. The requirement is to allow only two MAC addresses per port and shut down the port if violated. Which configuration achieves this?

What is the primary purpose of the Spanning Tree Protocol (STP) in a switched network?

A switch receives a frame with a destination MAC address that is not in its MAC address table. What action will the switch take?

A company has two sites connected via a WAN link. Site A uses network 10.1.0.0/16 and Site B uses 10.2.0.0/16. The router at Site A has been configured with a static route: 'ip route 10.2.0.0 255.255.0.0 Serial0/0/0'. Traffic is not reaching Site B. The local serial interface is up/up. What is the most likely issue?

An engineer needs to configure OSPF on a router with multiple interfaces. The requirement is to prevent OSPF from sending hello packets on the interface connected to the user network (Gi0/0) while still advertising that network. Which command accomplishes this?

A network has multiple equal-cost paths to a destination network. By default, how many equal-cost paths will a Cisco router use for load balancing when running OSPF?

What is the administrative distance of a directly connected network on a Cisco router?

A network administrator is implementing IPv6 and needs to configure an address that is unique globally but derived from the interface's MAC address. Which IPv6 address configuration method should be used?

A company's DHCP server is located on a different subnet than the client devices. Which feature must be configured on the router interface to allow clients to obtain IP addresses from the remote DHCP server?

An organization needs to synchronize time across all network devices for accurate logging and troubleshooting. Which protocol should be implemented and what is the recommended stratum level for internal time sources?

A network administrator needs to restrict Telnet access to a router so that only hosts from the 192.168.10.0/24 network can connect. Which configuration should be applied?

What is the primary difference between SSH and Telnet for remote device management?

An enterprise network requires wireless authentication that validates users against a central database and provides individual user credentials. Which combination of technologies should be implemented?

A network engineer needs to retrieve configuration data from multiple Cisco devices programmatically. Which model-driven programmability protocol uses YANG data models and can use SSH, NETCONF, or RESTCONF as transport?

Which data format is most commonly used with RESTful APIs for network automation and is human-readable, supports complex data structures, and is language-independent?