Multiple choice

Refer to the exhibit. The exhibited configurations do not allow the switches to form a trunk. What is the most likely cause of this problem?

  1. Cisco switches only support the ISL trunking protocol.

  2. The trunk cannot be negotiated with both ends set to auto.

  3. By default, Switch1 will only allow VLAN 5 across the link.

  4. A common native VLAN should have been configured on the switches.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When both switch ends are set to auto mode for trunk negotiation, no trunk will form because neither side actively initiates the negotiation. At least one end must be set to desirable or trunk mode for successful trunk establishment. Option A is incorrect because Cisco switches support both ISL and 802.1Q trunking protocols. Option C is incorrect because VLAN 5 would not block trunk formation. Option D is incorrect because mismatched native VLANs cause problems but don't prevent trunk formation itself.

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