Exam 300-420 topic 1 question 72 discussion

Actual exam question from Cisco's 300-420

Question #: 72
Topic #: 1

Refer to the exhibit. The connection between SW2 and SW3 is fiber and occasionally experiences unidirectional link failure. An architect must optimize the network to reduce the change of Layer 2 forwarding loops when the link fails. Which solution should the architect include?

A. Utilize BPDU filter on SW3.
B. Utilize root guard on SW1.
C. Utilize BPDU guard on SW1.
D. Utilize loop guard on SW2.

Show Suggested Answer

Suggested Answer: D 🗳️

by SpicyMochi at April 28, 2023, 7:16 p.m.

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StandAIone

8 months ago

Selected Answer: D

Reduce layer 2 forwarding loops -> loop guard

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SpicyMochi

1 year, 7 months ago

Selected Answer: D

The correct solution in this scenario is D. The architect should utilize loop guard on SW2. Loop guard is a Layer 2 protocol that is designed to prevent forwarding loops caused by unidirectional links or other issues that can result in a break in the Layer 2 topology. When a port is designated as a root or alternate port, it is expected to receive BPDUs from the designated bridge, and it sends its own BPDUs out that port. If the port stops receiving BPDUs, it is considered a possible loop condition. Loop guard places the root port into a loop-inconsistent state to avoid forwarding loops, which prevents the forwarding of data frames until the issue is resolved.

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