The answer is that the session is correctly configured as an RSPAN source session. This output indicates a valid Remote SPAN (RSPAN) source configuration because it shows a "Remote Source Session" type, with source port Gi0/0 capturing traffic in both directions, and the destination is an RSPAN VLAN (100) rather than a physical interface. In RSPAN, the source switch sends mirrored traffic over a dedicated VLAN to a remote destination switch, so seeing "Destination RSPAN VLAN" confirms the session is set to forward packets onto that VLAN for transport. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to differentiate between local SPAN, RSPAN source, and RSPAN destination sessions—a common trap is confusing the source-side output (which shows a VLAN as the destination) with a destination-side session, which would list source RSPAN VLAN and an actual monitor port. Remember the key: if the output says "Destination RSPAN VLAN," you are on the source switch; if it says "Source RSPAN VLAN," you are on the destination switch.
300-410 SPAN, RSPAN, and ERSPAN Practice Question
This 300-410 practice question tests your understanding of span, rspan, and erspan. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 to troubleshoot an RSPAN issue:
R1# show monitor session 2 detail
Session 2
---------
Type : Remote Source Session
Source Ports :
Both : Gi0/0
Destination RSPAN VLAN : 100
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 correctly configured as an RSPAN source session.
The output shows an RSPAN source session with source port Gi0/0 and destination RSPAN VLAN 100. This is the source side of an RSPAN configuration.
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 correctly configured as an RSPAN source session.
Why this is correct
The output confirms an RSPAN source session with a specified RSPAN VLAN.
Related concept
Access ports place end devices into a single VLAN.
✗
The session is misconfigured because the destination must be a port, not a VLAN.
Why it's wrong here
RSPAN uses a VLAN as the destination for remote monitoring.
✗
The session is misconfigured because the source port must be a VLAN.
Why it's wrong here
Source ports can be physical interfaces in RSPAN.
✗
The session is misconfigured because the RSPAN VLAN must be configured as a remote-span VLAN.
Why it's wrong here
The RSPAN VLAN must be configured as remote-span, but this output does not indicate a misconfiguration.
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.
Trap categories for this question
Command / output trap
The RSPAN VLAN must be configured as remote-span, but this output does not indicate a misconfiguration.
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 correctly configured as an RSPAN source session. — The output shows an RSPAN source session with source port Gi0/0 and destination RSPAN VLAN 100. This is the source side of an RSPAN configuration.
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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