Cisco Certified Network Associate (CCNA) Practice Exam

Which command shows information about trunking interfaces on a switch?

1. #show interfaces detail

2. #show interfaces trunk

3. #display trunk status

4. #show trunks all

The correct answer is: #show interfaces trunk

The command that provides information about trunking interfaces on a switch is the one that specifically references trunking. When executed, this command delivers detailed data on trunk interfaces, including their statuses, encapsulation types, and the VLANs that are allowed on each trunk interface. This is particularly useful for network administrators to verify the configuration and operation of trunking on their switches, ensuring that data flows correctly between VLANs. The other commands do not provide the specific information about trunking interfaces. For instance, while the command to show interfaces detail might offer a broad overview of all interfaces, it does not focus specifically on trunk configurations. Similarly, commands like display trunk status and show trunks all are not standard Cisco IOS commands; they might be relevant in other systems or variations but do not apply in the context of Cisco switches.