This 350-401 practice question tests your understanding of span and rspan. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command on Switch SW3:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
This switch receives mirrored traffic from the RSPAN VLAN and sends it to Gi1/0/15.
The session type is Remote Destination Session, which is the destination switch in an RSPAN setup. The source is an RSPAN VLAN (100), and the destination port Gi1/0/15 is used to monitor traffic from that VLAN. The destination port has Native encapsulation and ingress disabled, meaning it only sends out the mirrored traffic from the RSPAN VLAN.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
This switch receives mirrored traffic from the RSPAN VLAN and sends it to Gi1/0/15.
Why this is correct
The type 'Remote Destination Session' and source RSPAN VLAN indicate this.
Related concept
Access ports place end devices into a single VLAN.
✗
This is a local SPAN session with source VLAN 100.
Why it's wrong here
The type is Remote Destination, not Local.
✗
The RSPAN VLAN 100 is used to send traffic to a remote switch.
Why it's wrong here
This switch is the destination, so it receives from the RSPAN VLAN.
✗
Ingress traffic on Gi1/0/15 is forwarded to the RSPAN VLAN.
Why it's wrong here
Ingress is disabled, so no forwarding occurs.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
→Use show vlan brief to verify access VLANs.
→Use show interfaces trunk to verify trunk state and allowed VLANs.
→Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
SPAN and RSPAN — This question tests SPAN and RSPAN — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: This switch receives mirrored traffic from the RSPAN VLAN and sends it to Gi1/0/15. — The session type is Remote Destination Session, which is the destination switch in an RSPAN setup. The source is an RSPAN VLAN (100), and the destination port Gi1/0/15 is used to monitor traffic from that VLAN. The destination port has Native encapsulation and ingress disabled, meaning it only sends out the mirrored traffic from the RSPAN VLAN.
What should I do if I get this 350-401 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 350-401 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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