Cisco Certified Network Associate (CCNA) Practice Exam

What information does the Interface field provide in the #show eigrp neighbors output?

1. The routing protocol in use

2. The local router's IP address

3. The interface via which the neighbor is reachable

4. The metrics for the routes to the neighbors

The correct answer is: The interface via which the neighbor is reachable

The Interface field in the #show eigrp neighbors output provides the specific interface through which the EIGRP neighbor is reachable. This information is crucial for network administrators as it reveals which local interface is directly connected to the neighbor, allowing them to understand the topology of their network and identify potential issues related to connectivity. Knowing the interface helps in troubleshooting neighbor relationship problems that may arise due to configurations or physical connectivity issues. The other options present different types of information but do not directly describe the content of the Interface field. For instance, the routing protocol in use is indicated elsewhere in EIGRP configurations, while the local router’s IP address is reflected in different parts of the command output. Metrics for routes to neighbors, such as bandwidth or delay, relate to the paths EIGRP calculates but are not represented by the Interface field.