The answer is that the remote-span command designates VLAN 100 as an RSPAN VLAN, preventing it from being used for user data traffic. This is correct because the command marks the VLAN as a dedicated transport medium for mirrored traffic, ensuring that switches in the path treat it as a special-purpose VLAN that does not participate in normal data forwarding or spanning-tree operations. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how RSPAN isolates monitoring traffic from production traffic, often appearing in configuration or troubleshooting scenarios where a candidate might mistakenly assign user ports to the RSPAN VLAN. A common trap is assuming any VLAN can carry mirrored traffic without the remote-span keyword, which would cause data leaks or STP issues. For a memory tip, think of “remote-span” as “restrict-span”: it restricts the VLAN to only carry spanned traffic, keeping user data out.
300-410 SPAN, RSPAN, and ERSPAN Practice Question
This 300-410 practice question tests your understanding of span, rspan, and erspan. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Examine the RSPAN configuration:
vlan 100
name RSPAN_VLAN
remote-span
!
monitor session 1 source interface GigabitEthernet1/0/1 both
monitor session 1 destination remote vlan 100
What is the purpose of the 'remote-span' command under VLAN 100?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It allows VLAN 100 to be used for RSPAN traffic across multiple switches.
The 'remote-span' command designates VLAN 100 as an RSPAN VLAN, allowing it to carry mirrored traffic across switches without being used for normal data traffic.
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.
✓
It allows VLAN 100 to be used for RSPAN traffic across multiple switches.
Why this is correct
This is the standard function of remote-span.
Related concept
Access ports place end devices into a single VLAN.
✗
It enables spanning tree on VLAN 100.
Why it's wrong here
Remote-span does not affect spanning tree.
✓
It prevents VLAN 100 from being used for user data traffic.
Why this is correct
Correct, but the primary purpose is to enable RSPAN transport.
Related concept
Access ports place end devices into a single VLAN.
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: It allows VLAN 100 to be used for RSPAN traffic across multiple switches. — The 'remote-span' command designates VLAN 100 as an RSPAN VLAN, allowing it to carry mirrored traffic across switches without being used for normal data traffic.
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.
About these practice questions
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Variation 1. What is missing from this RSPAN configuration on a switch?
monitor session 1 source interface GigabitEthernet1/0/1 both
monitor session 1 destination remote vlan 100
Assume VLAN 100 exists but is not configured as an RSPAN VLAN.
medium
✓ A.The 'remote-span' command under VLAN 100.
B.An IP address on the destination interface.
C.A destination interface on the source switch.
D.The 'no shutdown' command on VLAN 100.
Why A: For RSPAN to work, the VLAN used as the destination remote VLAN must be configured with the 'remote-span' command. Without it, the session will not function correctly.
Last reviewed: Jun 19, 2026
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