Q36Advanced Addressing and Routing Solutions
Refer to the exhibit. The link between SW2 and SW3 uses fiber and periodically experiences a unidirectional link failure. An architect must optimize the network to reduce the possibility of Layer 2 forwarding loops when this link fails. Which solution should the architect include?
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D 2
Selected Answer: D
The right solution in this case is D. The architect should use loop guard on SW2.
Loop guard is a Layer 2 protocol that is meant to prevent forwarding loops caused by unidirectional links or other problems that can lead to a break in the Layer 2 topology. When a port is set 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 treated as a possible loop condition. Loop guard puts the root port into a loop-inconsistent state to prevent forwarding loops, which stops data frames from being forwarded until the issue is fixed.
D 1
Selected Answer: D
Reduce layer 2 forwarding loops -> loop guard