How do you verify trunking status on a Cisco switch? Learn why the “show interfaces trunk” command is essential for checking trunk configuration and troubleshooting switch-to-switch connectivity—key knowledge for the Cisco Certified Field Technician (CCT) exam.
Table of Contents
Question
A technician is troubleshooting a Cisco switch that is unable to establish a trunk connection with another switch. Which command should be used to verify the trunking status of an interface?
A. show ip interface brief
B. show interfaces trunk
C. show vlan brief
D. show spanning-tree
E. show port-security
Answer
B. show interfaces trunk
Explanation
This command displays which interfaces are configured as trunks, their allowed VLANs, and their operational status.
The command used to verify the trunking status of an interface on a Cisco switch is show interfaces trunk.
- The show interfaces trunk command displays all interfaces configured as trunk ports, their operational status, trunk encapsulation type (such as 802.1Q or ISL), native VLAN, and the list of VLANs allowed and active on each trunk.
- This command is essential for troubleshooting trunk connections because it quickly identifies whether a port is operating as a trunk, which VLANs are permitted, and if there are any mismatches or configuration errors between switches.
- It also helps confirm that both ends of the trunk are set up correctly and using compatible encapsulation protocols.
show interfaces trunk provides a comprehensive view of trunk ports, their status, encapsulation, and VLAN configuration, making it the primary troubleshooting tool for trunking issues on Cisco switches.
Cisco Certified Field Technician (CCT) certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco Certified Field Technician (CCT) exam and earn Cisco Certified Field Technician (CCT) certification.