Cisco Certified Network Associate (CCNA) Practice Exam

Which commands can be used to troubleshoot and verify trunk configurations on an interface?

1. #show interfaces trunk

2. #show running-config

3. #show interfaces INTERFACE switchport

4. All of the above

The correct answer is: All of the above

All three commands are valuable tools for troubleshooting and verifying trunk configurations on an interface in a Cisco network. The command that displays information specifically about trunking on interfaces is very useful for understanding how trunking is configured on your switch. It provides details such as the status of trunking, allowed VLANs, and encapsulation type, which are essential for ensuring that the trunk is set up correctly. The second command offers a broader view by showing the running configuration of the switch. This can help verify the interface settings, including trunk configurations and other related parameters, ensuring that everything is set up as intended. The third command focuses on a specific interface, providing detailed information about its switchport configuration. This includes whether the interface is in trunk mode, what VLANs are allowed, and other switchport parameters, which are crucial for troubleshooting issues related to VLANs and trunking. Using all these commands together gives a comprehensive understanding of the trunk configuration on a network device, which is crucial for effective troubleshooting and verification. Therefore, choosing the option that includes all these commands reflects a thorough approach to confirming trunk settings.