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300-410 Practice Question: Configures a SPAN session on a Cisco switch to…
A network engineer configures a SPAN session on a Cisco switch to monitor traffic on interface GigabitEthernet0/1 and sends it to interface GigabitEthernet0/2. The engineer notices that the destination port is up but does not forward any traffic. The engineer checks the configuration and sees that the destination port is configured as a trunk port. What is the most likely 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 destination port is configured as a trunk port instead of an access port.
SPAN destination ports should be access ports, not trunk ports. If a trunk port is used as a destination, the switch may not forward the monitored traffic correctly because the port expects tagged traffic.
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 is configured as a trunk port instead of an access port.
Why this is correct
Correct because SPAN destination ports should be access ports; trunk ports are not supported for SPAN destinations on most platforms.
- ✗
The source interface is in a different VLAN than the destination interface.
Why it's wrong here
Incorrect because SPAN does not require the source and destination to be in the same VLAN.
- ✗
The SPAN session is configured with the 'rx' direction only.
Why it's wrong here
Incorrect because even 'rx' direction should still forward traffic; the issue is the trunk configuration.
- ✗
The destination port is not in the same VLAN as the source interface.
Why it's wrong here
Incorrect because the destination port does not need to be in any specific VLAN; it receives a copy of the traffic.
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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.