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300-410 Practice Question: A switch is configured with SPAN to monitor…
A switch is configured with SPAN to monitor traffic on interface Gi0/0/0 to a local analyzer on interface Gi0/1. The configuration: monitor session 1 source interface Gi0/0/0 both monitor session 1 destination interface Gi0/1. The analyzer sees only half of the traffic (only incoming or outgoing). The switch also has an EtherChannel configured on Gi0/0/0 as part of a port-channel. The port-channel is up/up. What is the root cause?
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 source is a physical interface that is part of an EtherChannel; SPAN should be configured on the port-channel interface instead.
When a source interface is part of an EtherChannel, SPAN must be configured on the port-channel interface, not on the individual physical interface. If SPAN is configured on a physical interface that is part of a port-channel, the switch may only monitor traffic on that specific physical link, not the entire EtherChannel. This can result in only a portion of the traffic being mirrored. The fix is to use the port-channel interface as the source.
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 source is a physical interface that is part of an EtherChannel; SPAN should be configured on the port-channel interface instead.
Why this is correct
SPAN on a physical member of an EtherChannel only monitors that link, not the entire bundle.
- ✗
The destination interface Gi0/1 is not in the same VLAN as the source.
Why it's wrong here
SPAN does not require VLAN matching; it sends mirrored traffic regardless.
- ✗
The monitor session is missing the 'no shutdown' command.
Why it's wrong here
SPAN sessions are enabled by default.
- ✗
The EtherChannel load-balancing algorithm causes some traffic to be missed.
Why it's wrong here
The issue is not load-balancing but the source interface selection.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.