Cisco Certified Network Associate (CCNA) Practice Exam

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Which command is used to view the current routing protocols on a router?

show ip route
show ip protocols
show running-config
show interface INTERFACE NUMBER

The correct answer is: show ip protocols

The command used to view the current routing protocols on a router is 'show ip protocols'. This command provides key information about the routing protocols that are actively running, including details on any dynamic routing protocols that have been configured, such as RIP, EIGRP, or OSPF. It displays the parameters and settings associated with those protocols, as well as information about the routing updates that are being exchanged. In contrast, other commands serve different purposes. The 'show ip route' command is used to display the routing table, showing how packets are forwarded based on the existing routes rather than focusing on the protocols themselves. The 'show running-config' command reveals the current running configuration of the router, which includes all configurations but does not specifically concentrate on routing protocols alone. Lastly, the 'show interface INTERFACE NUMBER' command gives detailed information about a specific interface’s status, performance, and configuration, rather than routing protocols. Using 'show ip protocols' is essential for troubleshooting and verifying the configurations of dynamic routing protocols, making it a targeted and effective command for understanding the current routing setup on the device.