The answer is that the destination port Gi1/0/20 can forward incoming traffic in addition to sending mirrored traffic. This is because the output shows a local SPAN session with ingress enabled on the destination port, which is an unusual configuration. Normally, when you configure a SPAN destination port, ingress is disabled by default to prevent Layer 2 loops and to keep the port dedicated solely to receiving mirrored packets. By explicitly enabling ingress, the switch allows the destination port to both forward normal traffic arriving on it and continue to send the copied SPAN traffic out of it, which can be useful for inline monitoring tools or intrusion detection systems. On the ENCOR 350-401 exam, this scenario tests your understanding of SPAN behavior beyond the default settings, and a common trap is assuming that a destination port always drops incoming frames. A helpful memory tip is: "Ingress enabled on a SPAN destination means the port can both send mirrors and receive normal frames."
CCNP SPAN and RSPAN Practice Question
This 350-401 practice question tests your understanding of span and rspan. 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 SW7:
SW7# show monitor session 7
Session 7
---------
Type : Local Session
Source Ports :
Both : Gi1/0/1
Destination Ports : Gi1/0/20
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The destination port Gi1/0/20 can forward incoming traffic in addition to sending mirrored traffic.
This is a local SPAN session with ingress enabled on the destination port. Normally, ingress is disabled to prevent loops, but here it is enabled, meaning traffic arriving on Gi1/0/20 can be forwarded normally. This is unusual and may be used for specific monitoring purposes.
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 destination port Gi1/0/20 can forward incoming traffic in addition to sending mirrored traffic.
Why this is correct
Ingress enabled allows the port to forward received traffic.
Related concept
Access ports place end devices into a single VLAN.
✗
This is an RSPAN session with a remote VLAN.
Why it's wrong here
The type is Local, not Remote.
✗
Only egress traffic from Gi1/0/1 is mirrored.
Why it's wrong here
Both directions are captured.
✗
The destination port is configured to block all incoming traffic.
Why it's wrong here
Ingress is enabled, so traffic is not blocked.
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 — 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: The destination port Gi1/0/20 can forward incoming traffic in addition to sending mirrored traffic. — This is a local SPAN session with ingress enabled on the destination port. Normally, ingress is disabled to prevent loops, but here it is enabled, meaning traffic arriving on Gi1/0/20 can be forwarded normally. This is unusual and may be used for specific monitoring purposes.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command on Switch SW4:
SW4# show monitor session 4
Session 4
---------
Type : Local Session
Source VLANs :
RX Only : 10,20
Destination Ports : Gi1/0/25
Encapsulation : Native
Ingress : Disabled
Based on this output, what can be concluded?
medium
✓ A.Only incoming traffic on VLANs 10 and 20 is mirrored to Gi1/0/25.
B.Both incoming and outgoing traffic on VLANs 10 and 20 are mirrored.
C.This is an RSPAN session using VLANs 10 and 20 as remote VLANs.
D.The destination port Gi1/0/25 is configured to receive mirrored traffic.
Why A: The session is local SPAN with source VLANs 10 and 20, capturing only received traffic (RX Only). The destination port Gi1/0/25 sends out the mirrored traffic with Native encapsulation and ingress disabled. This monitors incoming traffic on those VLANs.
Variation 2. A network engineer runs the following command on Switch SW1:
SW1# show monitor session 1
Session 1
---------
Type : Local Session
Source Ports :
Both : Gi1/0/1
Both : Gi1/0/2
Destination Ports : Gi1/0/10
Encapsulation : Native
Ingress : Disabled
Based on this output, what can be concluded?
medium
✓ A.Traffic from Gi1/0/1 and Gi1/0/2 is copied to Gi1/0/10 for monitoring.
B.This is an RSPAN session that sends traffic to a remote VLAN.
C.Ingress traffic on Gi1/0/10 is forwarded to the source ports.
D.The destination port is configured to capture only egress traffic.
Why A: The output shows a local SPAN session with source ports Gi1/0/1 and Gi1/0/2 (both directions) and destination port Gi1/0/10. The destination port is set to Native encapsulation, meaning it sends traffic in the original VLAN format. Ingress is disabled, so no incoming traffic on the destination port is forwarded. This is a standard local SPAN configuration.
Last reviewed: Jun 18, 2026
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