200-301 Question 192
Select 3A network administrator is configuring a trunk link between two switches to allow multiple VLANs to communicate across the link. What configurations must be applied to ensure proper trunk operation?
- A
Both sides of the link must use the same trunking protocol (e.g., IEEE 802.1Q).
- B
The native VLAN must be the same on both ends of the trunk link.
- C
The trunk port must be configured to allow all VLANs by default.
- D
The trunk port must be explicitly set to access mode to enable VLAN tagging.
- E
The trunk port must have a consistent duplex mode on both ends.
Show answer and explanation
Correct answers: A, B, E
Explanation
To ensure proper trunk operation between two switches, both ends of the trunk link must use the same trunking protocol (e.g., IEEE 802.1Q), the native VLAN must match to prevent mismatches, and duplex settings must be consistent to avoid link errors. These configurations ensure smooth communication of VLAN-tagged traffic across the trunk link.
- A. Correct.
Correct. Both ends of the trunk link must use the same trunking protocol (e.g., 802.1Q) to ensure proper communication of VLAN-tagged frames.
- B. Correct.
Correct. The native VLAN on both ends of the trunk link must match to avoid VLAN mismatch issues and potential traffic loss.
- C. Incorrect.
Incorrect. By default, trunk ports allow all VLANs to pass traffic, but this is not a configuration requirement to ensure proper trunk operation.
- D. Incorrect.
Incorrect. Configuring the trunk port to access mode will disable trunking and prevent VLAN-tagged traffic from being sent or received.
- E. Correct.
Correct. Duplex mode must match on both ends to avoid collisions or degraded link performance.