- A
The SPAN session is monitoring traffic on Gi0/1 and Gi0/2 and sending it to Gi0/3.
The output clearly shows source ports Gi0/1 and Gi0/2, destination port Gi0/3, and type Local Session, confirming this.
- B
The SPAN session is monitoring traffic on Gi0/3 and sending it to Gi0/1 and Gi0/2.
Why wrong: Source and destination are reversed; Gi0/1 and Gi0/2 are sources, Gi0/3 is destination.
- C
The SPAN session is using RSPAN because the destination port has ingress disabled.
Why wrong: RSPAN uses a VLAN as the destination, not a port. Ingress disabled is typical for local SPAN destination ports.
- D
The SPAN session is not active because the destination port is not in forwarding state.
Why wrong: The output does not indicate any error; the session is active and configured.
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.
A network engineer runs the following command on switch SW1:
SW1# show monitor session 1
Session 1 --------- Type : Local Session Source Ports : Both : Gi0/1, Gi0/2 Destination Ports : Gi0/3
Encapsulation : Native
Ingress : Disabled
Based on this output, which statement is correct?
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 SPAN session is monitoring traffic on Gi0/1 and Gi0/2 and sending it to Gi0/3.
The output shows a local SPAN session with source ports Gi0/1 and Gi0/2, and destination port Gi0/3. The destination port is configured with native encapsulation and ingress is disabled, meaning traffic received on the destination port is not forwarded. The session is active and correctly configured.
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 SPAN session is monitoring traffic on Gi0/1 and Gi0/2 and sending it to Gi0/3.
Why this is correct
The output clearly shows source ports Gi0/1 and Gi0/2, destination port Gi0/3, and type Local Session, confirming this.
Related concept
Access ports place end devices into a single VLAN.
- ✗
The SPAN session is monitoring traffic on Gi0/3 and sending it to Gi0/1 and Gi0/2.
Why it's wrong here
Source and destination are reversed; Gi0/1 and Gi0/2 are sources, Gi0/3 is destination.
- ✗
The SPAN session is using RSPAN because the destination port has ingress disabled.
Why it's wrong here
RSPAN uses a VLAN as the destination, not a port. Ingress disabled is typical for local SPAN destination ports.
- ✗
The SPAN session is not active because the destination port is not in forwarding state.
Why it's wrong here
The output does not indicate any error; the session is active and configured.
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
Command / output trap
The output does not indicate any error; the session is active and configured.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 SPAN session is monitoring traffic on Gi0/1 and Gi0/2 and sending it to Gi0/3. — The output shows a local SPAN session with source ports Gi0/1 and Gi0/2, and destination port Gi0/3. The destination port is configured with native encapsulation and ingress is disabled, meaning traffic received on the destination port is not forwarded. The session is active and correctly configured.
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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