Cisco Certified Network Associate (CCNA) Practice Exam

Which command displays information about neighboring devices?

1. show cdp neighbors

2. show ip route

3. show interfaces

4. show version

The correct answer is: show cdp neighbors

The command that displays information about neighboring devices is "show cdp neighbors." This command is used in Cisco devices to show details about directly connected devices that are also using the Cisco Discovery Protocol (CDP). CDP is a proprietary protocol designed to help network devices learn information about each other, including device IDs, local interfaces, capabilities, and the platform of neighboring devices. When this command is executed, it provides a list of neighboring devices along with their respective details, making it easier for network administrators to map the topology of a network. This visibility is crucial for troubleshooting network issues, managing network changes, and ensuring that the network is operating efficiently. The other commands, while useful for different purposes, do not provide specific information about neighboring devices. "Show ip route" focuses on the routing table of the device, "show interfaces" provides details about the interfaces on the device such as status and statistics, and "show version" gives information about the device's hardware and software configurations. Each of these commands serves a distinct role in network management but does not directly report on neighboring device status or configuration.