Cisco Certified Network Associate (CCNA) Practice Exam

To check for EIGRP feasible successors, which command would you use?

1. #show eigrp topology

2. #show ip protocols

3. #show ip eigrp neighbors

4. #debug eigrp notifications

The correct answer is: #show eigrp topology

The correct command to check for EIGRP feasible successors is the command to display the EIGRP topology table. This command provides a detailed view of all the routes that EIGRP has, including both the primary successors and any feasible successors that may be used if the primary route fails. Feasible successors are essential for EIGRP’s rapid convergence because they are backup routes that meet the feasibility condition, which involves ensuring that the reported distance from a neighbor is less than the feasible distance of the route being considered. By using the command to show the EIGRP topology, the network administrator can inspect the topology table to identify these potential backup routes. It offers insights into the paths that EIGRP has computed and verifies whether feasible successors exist for each route, ensuring redundancy in routing decisions. In contrast, the other options serve different purposes: the command to show IP protocols provides a summary of routing protocols running on the router, while the command to show IP EIGRP neighbors lists the neighboring devices with which EIGRP has established a relationship. The command for debugging EIGRP notifications is primarily used for troubleshooting rather than monitoring the topology or finding feasible successors. Each of these commands provides valuable information, but the topology command specifically addresses the inquiry about feasible