- A
Configure 'monitor session 1 type erspan-source' and then 'source vlan 100' and 'destination ip 192.168.1.100'.
Correct; ERSPAN source session requires the type erspan-source, source VLAN, and destination IP address.
- B
Configure 'monitor session 1 source vlan 100' and 'monitor session 1 destination interface Gi1/0/24'.
Why wrong: Incorrect; this is local SPAN, not ERSPAN.
- C
Configure 'monitor session 1 source vlan 100' and 'monitor session 1 destination remote vlan 999'.
Why wrong: Incorrect; this is RSPAN, which requires a Layer 2 path, not a routed network.
- D
Configure 'monitor session 1 source vlan 100' and 'monitor session 1 destination interface Gi1/0/24' and then 'monitor session 1 encapsulation replicate'.
Why wrong: Incorrect; this is still local SPAN with encapsulation, not ERSPAN.
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.
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.
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?
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'.
- ✗
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.
- →
SPAN and RSPAN — study guide chapter
Learn the concepts, then practise the questions
- →
SPAN and RSPAN practice questions
Targeted practice on this topic area only
- →
All 350-401 questions
2,015 questions across all exam domains
- →
ENCOR 350-401 study guide
Full concept coverage aligned to exam objectives
- →
350-401 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 350-401 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Architecture practice questions
Practise 350-401 questions linked to Architecture.
Enterprise Network Design practice questions
Practise 350-401 questions linked to Enterprise Network Design.
SD-Access Architecture practice questions
Practise 350-401 questions linked to SD-Access Architecture.
SD-WAN Architecture practice questions
Practise 350-401 questions linked to SD-WAN Architecture.
QoS Architecture practice questions
Practise 350-401 questions linked to QoS Architecture.
Virtualization practice questions
Practise 350-401 questions linked to Virtualization.
Network Function Virtualization practice questions
Practise 350-401 questions linked to Network Function Virtualization.
Virtual Machines and Hypervisors practice questions
Practise 350-401 questions linked to Virtual Machines and Hypervisors.
VRF and Path Isolation practice questions
Practise 350-401 questions linked to VRF and Path Isolation.
Infrastructure practice questions
Practise 350-401 questions linked to Infrastructure.
OSPF practice questions
Practise 350-401 questions linked to OSPF.
BGP practice questions
Practise 350-401 questions linked to BGP.
Practice this exam
Start a free 350-401 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More 350-401 practice questions
- Drag and drop the steps to configure an extended access control list (ACL) on a Cisco router in the correct order.
- Drag and drop the steps to configure a site-to-site IPsec VPN on a Cisco router in the correct order.
- Drag and drop the steps to configure VLAN Trunking Protocol (VTP) on a Cisco switch in the correct order.
- Drag and drop the steps to configure a static route on a Cisco IOS router into the correct order.
- Drag and drop the steps to configure port security on a Cisco switch in the correct order.
- Drag and drop the steps for the Spanning Tree Protocol (STP) convergence process in the correct order.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.