This 300-410 practice question tests your understanding of span, rspan, and erspan. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 statement about RSPAN source session is correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The RSPAN source session must specify a destination RSPAN VLAN.
An RSPAN source session mirrors traffic from source ports to an RSPAN VLAN. The source session can monitor a single VLAN or a set of ports, but not both in the same session. The destination is always the RSPAN VLAN.
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 RSPAN source session can send mirrored traffic to multiple RSPAN VLANs simultaneously.
Why it's wrong here
Each source session can only have one destination RSPAN VLAN.
✗
The RSPAN source session can monitor both a VLAN and individual ports at the same time.
Why it's wrong here
A single session can monitor either a VLAN or a set of ports, not both.
✓
The RSPAN source session must specify a destination RSPAN VLAN.
Why this is correct
The destination for an RSPAN source session is always an RSPAN VLAN, which must be configured with 'remote-span'.
Related concept
Access ports place end devices into a single VLAN.
✗
The RSPAN source session can use a physical interface as a destination instead of a VLAN.
Why it's wrong here
RSPAN uses VLANs to transport mirrored traffic; the destination is always a VLAN, not a physical interface.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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.
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 RSPAN source session must specify a destination RSPAN VLAN. — An RSPAN source session mirrors traffic from source ports to an RSPAN VLAN. The source session can monitor a single VLAN or a set of ports, but not both in the same session. The destination is always the RSPAN VLAN.
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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