Question 435 of 2,152

SPAN, RSPAN, and ERSPAN →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to verify that the RSPAN VLAN is configured with the remote-span command on both switches. This command is mandatory because it marks the VLAN as a dedicated RSPAN VLAN, preventing it from being treated as a standard user-data VLAN and ensuring that mirrored traffic is correctly flooded across the trunk to the destination switch. Without remote-span, the VLAN may drop or misdirect the monitored frames, which is why the destination port on Switch B remains inactive. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of the RSPAN remote-span configuration prerequisite, often appearing as a common trap where candidates assume simply allowing the VLAN on a trunk is sufficient. Remember the memory tip: if you want to span remotely, the VLAN must be marked remotely—think of remote-span as the “green light” that tells the switch, “This VLAN is for monitoring only, not for normal traffic.”

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.

A network engineer configures an RSPAN session on Switch A to monitor traffic from interface GigabitEthernet0/1 and sends it to Switch B. The engineer creates RSPAN VLAN 50 on both switches and configures the trunk between them to allow VLAN 50. On Switch B, the engineer configures the destination port as GigabitEthernet0/2 in VLAN 50. The engineer notices that the destination port is not forwarding any traffic. What should the engineer check first?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

Question 1hardmultiple choice

Open the full VLAN trunking answer →

A
Verify that the RSPAN VLAN is configured with the 'remote-span' command on both switches.
Correct because the 'remote-span' command is essential to designate the VLAN as an RSPAN VLAN; without it, the VLAN behaves as a normal VLAN.
B
Check that the destination port is not in a shutdown state.
Why wrong: Incorrect because the port is likely up; the issue is more specific to RSPAN configuration.
C
Ensure that the source interface is not configured with 'no monitor session'.
Why wrong: Incorrect because the session is configured; the problem is on the RSPAN VLAN itself.
D
Confirm that the trunk between switches is configured as a dot1q trunk.
Why wrong: Incorrect because the trunk is already configured to allow VLAN 50; the missing 'remote-span' is the likely cause.

Full breakdown with real-world context →

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

✓

Verify that the RSPAN VLAN is configured with the 'remote-span' command on both switches.

RSPAN requires that the RSPAN VLAN be configured with the 'remote-span' command on all switches that participate. Without this, the VLAN may not be treated as an RSPAN VLAN and traffic may not be forwarded correctly.

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.

✓
Verify that the RSPAN VLAN is configured with the 'remote-span' command on both switches.
Why this is correct
Correct because the 'remote-span' command is essential to designate the VLAN as an RSPAN VLAN; without it, the VLAN behaves as a normal VLAN.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
✗
Check that the destination port is not in a shutdown state.
Why it's wrong here
Incorrect because the port is likely up; the issue is more specific to RSPAN configuration.
✗
Ensure that the source interface is not configured with 'no monitor session'.
Why it's wrong here
Incorrect because the session is configured; the problem is on the RSPAN VLAN itself.
✗
Confirm that the trunk between switches is configured as a dot1q trunk.
Why it's wrong here
Incorrect because the trunk is already configured to allow VLAN 50; the missing 'remote-span' is the likely cause.

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 300-410 questions on switching, trunking, and access-port configuration.

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FAQ

Questions learners often ask

What does this 300-410 question test?

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: Verify that the RSPAN VLAN is configured with the 'remote-span' command on both switches. — RSPAN requires that the RSPAN VLAN be configured with the 'remote-span' command on all switches that participate. Without this, the VLAN may not be treated as an RSPAN VLAN and traffic may not be forwarded correctly.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Access ports place end devices into a single VLAN.

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