200-301 Question 173
Single answerYou are configuring VLANs spanning multiple switches in a network. Switch1 is connected to Switch2 via a trunk link. VLAN 10 and VLAN 20 are configured on Switch1. After verifying the configuration, you notice that devices in VLAN 10 on Switch2 cannot communicate with devices in VLAN 10 on Switch1. What could be the issue?
- A
The trunk link between Switch1 and Switch2 is not configured.
- B
VLAN 10 is not created on Switch2.
- C
The native VLAN is mismatched on the trunk ports between Switch1 and Switch2.
- D
The trunk link is administratively shut down on Switch2.
Show answer and explanation
Correct answer: B
Explanation
For VLANs to span multiple switches, they must be created on all switches involved, and the trunk link must allow the VLAN traffic. In this scenario, the trunk link is functional, but VLAN 10 is not created on Switch2, preventing communication between devices in VLAN 10 across the switches.
- A. Incorrect.
If the trunk link was not configured, no VLAN traffic would pass between Switch1 and Switch2. However, the issue in this scenario is specific to VLAN 10, so this is not the correct answer.
- B. Correct.
For VLAN traffic to traverse multiple switches, the VLAN must exist on all switches involved. If VLAN 10 is not created on Switch2, devices in VLAN 10 on Switch2 will not be able to communicate with devices in VLAN 10 on Switch1.
- C. Incorrect.
While a native VLAN mismatch can cause issues, it would not prevent devices in VLAN 10 from communicating unless VLAN 10 traffic was being treated as native VLAN traffic. This is not the correct answer for this scenario.
- D. Incorrect.
If the trunk link is administratively shut down, no traffic at all would pass between the switches. However, the issue described is specific to VLAN 10, not the trunk link overall, so this is not the correct answer.