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300-410 Practice Question: An engineer configures SPAN on a Cisco switch to…
An engineer configures SPAN on a Cisco switch to monitor traffic from a port that is also a SPAN destination for another session. The switch rejects the configuration. What is the most likely reason?
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
✓
A SPAN destination port cannot be a SPAN source port due to hardware restrictions.
A SPAN destination port cannot be used as a SPAN source port in any session. This is a hardware limitation: the port is dedicated to receiving mirrored traffic and cannot also be monitored. The switch will return an error if you try to configure it as a 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.
- ✓
A SPAN destination port cannot be a SPAN source port due to hardware restrictions.
Why this is correct
The switch enforces that a port used as a destination cannot also be a source, as it would create a loop in the monitoring path.
- ✗
The SPAN session ID must be unique; overlapping sessions cause conflicts.
Why it's wrong here
Session IDs are independent; the issue is port assignment.
- ✗
The switch has reached the maximum number of SPAN sessions.
Why it's wrong here
The error is specific to the port role, not session count.
- ✗
The port is a trunk, and SPAN cannot monitor trunk ports as destinations.
Why it's wrong here
Trunk ports can be SPAN destinations; the issue is dual role.
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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.