This 300-410 practice question tests your understanding of span, rspan, and erspan. 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:
SW3# show monitor session 3
Session 3
---------
Type : Remote Destination Session
Source Ports :
RX Only : Gi0/6
Destination Ports : Gi0/7
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The session is an RSPAN destination session, and traffic from the RSPAN VLAN is received on Gi0/6 and sent to Gi0/7.
This is an RSPAN destination session. It receives mirrored traffic from the RSPAN VLAN via source port Gi0/6 (RX only) and sends it to destination port Gi0/7 for analysis. The source port is typically a trunk port carrying 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.
✓
The session is an RSPAN destination session, and traffic from the RSPAN VLAN is received on Gi0/6 and sent to Gi0/7.
Why this is correct
The type 'Remote Destination Session' confirms RSPAN destination, with Gi0/6 as source and Gi0/7 as destination.
Related concept
Access ports place end devices into a single VLAN.
✗
The session is an ERSPAN destination session because it uses RX only.
Why it's wrong here
ERSPAN uses IP encapsulation, not VLAN-based. This is RSPAN.
✗
The session is a local SPAN session with source port Gi0/6.
Why it's wrong here
The type is 'Remote Destination Session', not local.
✗
The session is misconfigured because the destination port has ingress disabled.
Why it's wrong here
Ingress disabled is normal for SPAN destination ports to prevent forwarding.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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 300-410 questions on switching, trunking, and access-port configuration.
SPAN, RSPAN, and ERSPAN — This question tests SPAN, RSPAN, and ERSPAN — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: The session is an RSPAN destination session, and traffic from the RSPAN VLAN is received on Gi0/6 and sent to Gi0/7. — This is an RSPAN destination session. It receives mirrored traffic from the RSPAN VLAN via source port Gi0/6 (RX only) and sends it to destination port Gi0/7 for analysis. The source port is typically a trunk port carrying the RSPAN VLAN.
What should I do if I get this 300-410 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 300-410 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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