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. 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.
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.
The 'remote-span' command under VLAN 100.
This is required to designate the VLAN as an RSPAN VLAN.
An IP address on the destination interface.
Why wrong: RSPAN does not require IP addresses on the VLAN.
A destination interface on the source switch.
Why wrong: RSPAN uses a VLAN, not a local interface.
The 'no shutdown' command on VLAN 100.
Why wrong: VLANs are typically enabled by default.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The 'remote-span' command under VLAN 100.
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.
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
For each option: why learners choose it and why it is or isn't the right answer here.
The 'remote-span' command under VLAN 100.
An IP address on the destination interface.
Why it's wrong here
RSPAN does not require IP addresses on the VLAN.
A destination interface on the source switch.
Why it's wrong here
RSPAN uses a VLAN, not a local interface.
The 'no shutdown' command on VLAN 100.
Why it's wrong here
VLANs are typically enabled by default.
Common exam traps
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
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.
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
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
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 — study guide chapter
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FAQ
SPAN, RSPAN, and ERSPAN — This question tests SPAN, RSPAN, and ERSPAN — Access ports place end devices into a single VLAN..
The correct answer is: The 'remote-span' command under VLAN 100. — 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.
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.
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 19, 2026
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