Question 431 of 2,152

SPAN, RSPAN, and ERSPAN →mediumMultiple ChoiceObjective-mapped

RSPAN Remote-Span Command Purpose

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. A key principle to apply: rSPAN. 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?

A
It allows VLAN 100 to be used for RSPAN traffic across multiple switches.
Correct. The 'remote-span' command marks VLAN 100 as an RSPAN VLAN, enabling it to carry mirrored traffic across switches in the network.
B
It enables spanning tree on VLAN 100.
Why wrong: Incorrect. The 'remote-span' command does not affect spanning tree; it is unrelated to spanning tree operations.
C
It prevents VLAN 100 from being used for user data traffic.
Why wrong: While it is true that RSPAN VLANs are not used for user data, the primary purpose of the command is to enable the VLAN for RSPAN traffic; preventing user data is a consequence, not the intended purpose.
D
It configures VLAN 100 as a native VLAN.
Why wrong: Incorrect. The 'remote-span' command does not configure a native VLAN; native VLAN is a different concept in trunking.

Full breakdown with real-world context →

Quick Answer

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.

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

✓

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. This is its primary purpose. While it also prevents user data traffic, that is a secondary effect, not the main purpose.

Key principle: RSPAN

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
Correct. The 'remote-span' command marks VLAN 100 as an RSPAN VLAN, enabling it to carry mirrored traffic across switches in the network.
Related concept
RSPAN
✗
It enables spanning tree on VLAN 100.
Why it's wrong here
Incorrect. The 'remote-span' command does not affect spanning tree; it is unrelated to spanning tree operations.
✗
It prevents VLAN 100 from being used for user data traffic.
Why it's wrong here
While it is true that RSPAN VLANs are not used for user data, the primary purpose of the command is to enable the VLAN for RSPAN traffic; preventing user data is a consequence, not the intended purpose.
✗
It configures VLAN 100 as a native VLAN.
Why it's wrong here
Incorrect. The 'remote-span' command does not configure a native VLAN; native VLAN is a different concept in trunking.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

Command / output trap
Incorrect. The 'remote-span' command does not affect spanning tree; it is unrelated to spanning tree operations.

Detailed technical explanation

How to think about this question

Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.

KKey Concepts to Remember

RSPAN
remote-span

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

RSPAN

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Review rSPAN, then practise related 300-410 questions on the same topic to reinforce the concept.

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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 — RSPAN.

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. This is its primary purpose. While it also prevents user data traffic, that is a secondary effect, not the main purpose.

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

Review rSPAN, then practise related 300-410 questions on the same topic to reinforce the concept.

What is the key concept behind this question?

RSPAN

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Same concept, more angles

1 more ways this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

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.

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