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300-410 Practice Question: An engineer configures RSPAN on a switch stack to…
An engineer configures RSPAN on a switch stack to monitor traffic from a VLAN. The RSPAN destination port is on a different stack member. The mirrored traffic works intermittently, with gaps during stack master re-election. What is the most likely explanation?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
RSPAN traffic traverses the stack ring, which is disrupted during master re-election.
In a switch stack, RSPAN traffic is forwarded across the stack ring. During master re-election, the stack ring may briefly go down or reconverge, causing loss of RSPAN traffic. Additionally, if the RSPAN VLAN is not configured consistently across all stack members, traffic may be dropped.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
RSPAN traffic traverses the stack ring, which is disrupted during master re-election.
Why this is correct
The stack ring is used for inter-member communication; a master change can cause temporary disruption.
- ✗
The RSPAN VLAN is pruned on the stack ring due to VTP pruning.
Why it's wrong here
VTP pruning is not typically enabled on stack rings, and the issue is intermittent.
- ✗
The RSPAN session is configured on the master only, and does not survive failover.
Why it's wrong here
RSPAN sessions are replicated to all stack members; they persist across failover.
- ✗
The destination port is on a different VLAN than the source, causing a mismatch.
Why it's wrong here
RSPAN uses a dedicated VLAN; the destination port is in that VLAN, not the source VLAN.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.