CompTIA Network+ Practice Test

What information can be obtained from the command 'show interface'?

1. Only the connected devices

2. Status, configuration, and error information

3. The routing information

4. Events related to power supply

The correct answer is: Status, configuration, and error information

The command 'show interface' is a commonly used command on network devices, particularly routers and switches, to display vital information about the interfaces present on the device. When this command is executed, it provides a comprehensive overview that includes the status of each interface (whether it is up or down), detailed configuration settings, and statistics about data transmission errors and drop counts. This information is critical for network administrators as it helps in diagnosing connectivity issues, evaluating performance, and monitoring overall interface health. For instance, if an interface is experiencing a high number of errors, the network administrator can investigate further to uncover potential hardware issues or configuration problems. The other options provided do not capture the full scope of information offered by the 'show interface' command. While connected devices primarily relate to insights gained from commands like 'show mac address-table,' routing information is typically displayed through commands such as 'show route' or 'show ip route.' Lastly, events concerning power supply would be viewed through different commands related to system status or hardware conditions, rather than interface-level commands. Thus, understanding the breadth of data provided by 'show interface' highlights its importance in network management.