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SPAN and RSPAN →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to configure 'monitor session 1 type erspan-source' followed by 'source vlan 100' and 'destination ip 192.168.1.100'. This is correct because ERSPAN (Encapsulated Remote SPAN) encapsulates mirrored traffic in a GRE tunnel to transport it across a routed Layer 3 network, unlike local SPAN which requires the destination to be on the same switch, or RSPAN which relies on a dedicated VLAN. On the ENCOR 350-401 exam, this question tests your ability to distinguish between SPAN, RSPAN, and ERSPAN configurations, with the common trap being to confuse the 'erspan-source' session type with the 'erspan-destination' type on the remote switch. A key memory tip is to think of ERSPAN as "SPAN over IP"—if the monitoring station is on a different subnet, you must use the 'erspan-source' session and specify the destination IP address, not a VLAN or interface.

CCNP 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.

A network engineer needs to monitor traffic from a specific VLAN (VLAN 100) on a Cisco Catalyst 9300 switch and send the mirrored traffic to a monitoring station on a different switch across a routed network. The engineer decides to use ERSPAN. Which configuration is required on the source switch?

Question 1hardmultiple choice
Open the full VLAN trunking answer →

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

✓

Configure 'monitor session 1 type erspan-source' and then 'source vlan 100' and 'destination ip 192.168.1.100'.

ERSPAN encapsulates mirrored traffic in GRE and sends it over IP. On the source switch, the engineer must configure an ERSPAN source session that specifies the source VLAN and the destination IP address of the monitoring station or the destination switch. The correct answer is to configure 'monitor session 1 type erspan-source' and then specify the source VLAN and the destination IP. Option B is incorrect because that is for local SPAN. Option C is incorrect because that is for RSPAN. Option D is incorrect because that is for local SPAN with a VLAN source.

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.

  • ✓

    Configure 'monitor session 1 type erspan-source' and then 'source vlan 100' and 'destination ip 192.168.1.100'.

    Why this is correct

    Correct; ERSPAN source session requires the type erspan-source, source VLAN, and destination IP address.

    Related concept

    Access ports place end devices into a single VLAN.

  • ✗

    Configure 'monitor session 1 source vlan 100' and 'monitor session 1 destination interface Gi1/0/24'.

    Why it's wrong here

    Incorrect; this is local SPAN, not ERSPAN.

  • ✗

    Configure 'monitor session 1 source vlan 100' and 'monitor session 1 destination remote vlan 999'.

    Why it's wrong here

    Incorrect; this is RSPAN, which requires a Layer 2 path, not a routed network.

  • ✗

    Configure 'monitor session 1 source vlan 100' and 'monitor session 1 destination interface Gi1/0/24' and then 'monitor session 1 encapsulation replicate'.

    Why it's wrong here

    Incorrect; this is still local SPAN with encapsulation, not ERSPAN.

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 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: Configure 'monitor session 1 type erspan-source' and then 'source vlan 100' and 'destination ip 192.168.1.100'. — ERSPAN encapsulates mirrored traffic in GRE and sends it over IP. On the source switch, the engineer must configure an ERSPAN source session that specifies the source VLAN and the destination IP address of the monitoring station or the destination switch. The correct answer is to configure 'monitor session 1 type erspan-source' and then specify the source VLAN and the destination IP. Option B is incorrect because that is for local SPAN. Option C is incorrect because that is for RSPAN. Option D is incorrect because that is for local SPAN with a VLAN source.

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

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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.