- A
The RSPAN VLAN 100 must be created on all switches in the network that participate in RSPAN.
For RSPAN to work, the RSPAN VLAN must exist on all switches that forward the mirrored traffic.
- B
The destination remote vlan 100 command is incorrect; it should be 'destination remote vlan 100 encapsulation replicate'.
Why wrong: The 'encapsulation replicate' keyword is optional and not required for the command to be valid.
- C
This configuration copies traffic from VLAN 10 to the local switch only.
Why wrong: RSPAN uses a remote VLAN to transport mirrored traffic across the network, not just locally.
- D
The RSPAN VLAN 100 must be tagged on all trunk ports between switches.
Why wrong: The RSPAN VLAN must be allowed on trunk ports, but it does not require tagging; it can be native or tagged depending on configuration.
350-401 SPAN and RSPAN Practice Question
This 350-401 practice question tests your understanding of span and rspan. 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 following RSPAN configuration on a Cisco Catalyst switch:
vlan 100
name RSPAN_VLAN remote-span
monitor session 1 source vlan 10 both monitor session 1 destination remote vlan 100
Which statement about this configuration is true?
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
The RSPAN VLAN 100 must be created on all switches in the network that participate in RSPAN.
This configures an RSPAN session where traffic from VLAN 10 is sent to the RSPAN VLAN 100, which is then transported across the network to other switches.
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 RSPAN VLAN 100 must be created on all switches in the network that participate in RSPAN.
- ✗
The destination remote vlan 100 command is incorrect; it should be 'destination remote vlan 100 encapsulation replicate'.
Why it's wrong here
The 'encapsulation replicate' keyword is optional and not required for the command to be valid.
- ✗
This configuration copies traffic from VLAN 10 to the local switch only.
Why it's wrong here
RSPAN uses a remote VLAN to transport mirrored traffic across the network, not just locally.
- ✗
The RSPAN VLAN 100 must be tagged on all trunk ports between switches.
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
Keyword trap
The 'encapsulation replicate' keyword is optional and not required for the command to be valid.
Command / output trap
The 'encapsulation replicate' keyword is optional and not required for the command to be valid.
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.
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FAQ
Questions learners often ask
What does this 350-401 question test?
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: The RSPAN VLAN 100 must be created on all switches in the network that participate in RSPAN. — This configures an RSPAN session where traffic from VLAN 10 is sent to the RSPAN VLAN 100, which is then transported across the network to other switches.
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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Last reviewed: Jun 18, 2026
This 350-401 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 350-401 exam.
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