Cisco Certified Network Associate (CCNA) Practice Exam

Which command would you use to display detailed information about an interface's status?

1. show ip interface

2. show interface status

3. show interfaces

4. show ip route

The correct answer is: show interfaces

The command "show interfaces" is used to display detailed information about a specific interface's status on a networking device. When executed, it provides a wealth of information, including the interface's operational status (up or down), its protocol status, bandwidth, MTU (Maximum Transmission Unit) size, and statistics on packets transmitted and received. This command allows network administrators to diagnose problems with the interface and assess its performance effectively. While other commands, such as "show ip interface," also provide information about interfaces, they typically focus more on IP-level configurations and statistics rather than the overall detailed status of all aspects of the interfaces. Other options, like "show interface status," might provide a summary view of interfaces, including whether they are up or down, but lack the rich detail found in "show interfaces." The command "show ip route" focuses specifically on the routing table and does not provide any information regarding interface status. Thus, "show interfaces" is the most comprehensive and informative command for assessing interface status.