- A
The command 'show monitor session all' displays a summary of all configured SPAN, RSPAN, and ERSPAN sessions.
Correct. 'show monitor session all' lists all sessions with their status, source, and destination.
- B
The command 'show monitor session <session> detail' displays the operational status and any errors for that session.
Correct. The detail keyword shows additional information such as whether the session is up, the number of packets mirrored, and any errors.
- C
The command 'show monitor session <session> type erspan-source' is used to verify ERSPAN source sessions.
Why wrong: Incorrect. The correct syntax is 'show monitor session <session>' or 'show monitor session <session> detail'; the 'type erspan-source' is not a valid verification command (it is used in configuration).
- D
The command 'show spanning-tree vlan <rspan-vlan>' can confirm that the RSPAN VLAN is correctly configured and forwarding.
Why wrong: Incorrect. While 'show spanning-tree' can show the RSPAN VLAN, it is not a primary verification tool for RSPAN operation; 'show monitor' is more relevant.
- E
The command 'show monitor session <session> statistics' provides packet counts for mirrored traffic.
Why wrong: Incorrect. There is no 'statistics' keyword for 'show monitor session'; packet counts are shown in 'show monitor session <session> detail'.
300-410 SPAN, RSPAN, and ERSPAN Practice Question
This 300-410 practice question tests your understanding of span, rspan, and erspan. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Which TWO statements about verifying SPAN, RSPAN, and ERSPAN sessions are correct? (Choose TWO.)
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 command 'show monitor session all' displays a summary of all configured SPAN, RSPAN, and ERSPAN sessions.
Verification commands include 'show monitor session <session>' for detailed status, 'show monitor' for a summary, and 'show monitor session <session> detail' for more granular info. For ERSPAN, 'show monitor session <session> type erspan-source' can be used. The 'show spanning-tree' command is unrelated.
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 command 'show monitor session all' displays a summary of all configured SPAN, RSPAN, and ERSPAN sessions.
Why this is correct
Correct. 'show monitor session all' lists all sessions with their status, source, and destination.
Related concept
Access ports place end devices into a single VLAN.
- ✓
The command 'show monitor session <session> detail' displays the operational status and any errors for that session.
Why this is correct
Correct. The detail keyword shows additional information such as whether the session is up, the number of packets mirrored, and any errors.
Related concept
Access ports place end devices into a single VLAN.
- ✗
The command 'show monitor session <session> type erspan-source' is used to verify ERSPAN source sessions.
Why it's wrong here
Incorrect. The correct syntax is 'show monitor session <session>' or 'show monitor session <session> detail'; the 'type erspan-source' is not a valid verification command (it is used in configuration).
- ✗
The command 'show spanning-tree vlan <rspan-vlan>' can confirm that the RSPAN VLAN is correctly configured and forwarding.
Why it's wrong here
Incorrect. While 'show spanning-tree' can show the RSPAN VLAN, it is not a primary verification tool for RSPAN operation; 'show monitor' is more relevant.
- ✗
The command 'show monitor session <session> statistics' provides packet counts for mirrored traffic.
Why it's wrong here
Incorrect. There is no 'statistics' keyword for 'show monitor session'; packet counts are shown in 'show monitor session <session> detail'.
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
Incorrect. There is no 'statistics' keyword for 'show monitor session'; packet counts are shown in 'show monitor session <session> detail'.
Command / output trap
Incorrect. The correct syntax is 'show monitor session <session>' or 'show monitor session <session> detail'; the 'type erspan-source' is not a valid verification command (it is used in configuration).
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: The command 'show monitor session all' displays a summary of all configured SPAN, RSPAN, and ERSPAN sessions. — Verification commands include 'show monitor session <session>' for detailed status, 'show monitor' for a summary, and 'show monitor session <session> detail' for more granular info. For ERSPAN, 'show monitor session <session> type erspan-source' can be used. The 'show spanning-tree' command is unrelated.
What should I do if I get this 300-410 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 300-410 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 19, 2026
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