Cisco
300-420 · Question #409
A network engineer discovers that an alternate or root port on a Cisco Layer 2 switch intermittently becomes the designated port, which causes an STP loop. What must be configured to resolve the…
The correct answer is C. STP loop guard. STP loop guard prevents alternate or root ports from becoming designated ports when they stop receiving BPDUs, which protects against STP loops caused by unidirectional or intermittent link
Advanced Enterprise Campus Networks
Question
A network engineer discovers that an alternate or root port on a Cisco Layer 2 switch intermittently becomes the designated port, which causes an STP loop. What must be configured to resolve the issue?
Options
- ASTP root guard
- BPortFast BPDU guard
- CSTP loop guard
- DUDLD
How the community answered
(55 responses)- A15% (8)
- B9% (5)
- C73% (40)
- D4% (2)
Explanation
STP loop guard prevents alternate or root ports from becoming designated ports when they stop receiving BPDUs, which protects against STP loops caused by unidirectional or intermittent link
Topics
#STP Loop Guard#Spanning Tree Protocol#Layer 2 Switching#STP Protection Mechanisms
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