350-501 MPLS and Segment Routing Practice Question
In MPLS, which operation is performed when a packet arrives at a transit router and the top label matches the router's own label assigned for the FEC?
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
✓
Pop the top label.
When the top label is the router's own label (often an implicit null or explicit null), the router pops the label and forwards the packet based on the next label or IP header.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Pop the top label.
Why this is correct
Correct.
- ✗
Push a new label onto the stack.
Why it's wrong here
Push is done at ingress LER.
- ✗
Drop the packet.
Why it's wrong here
No, it forwards after popping.
- ✗
Swap the top label with a new label.
Why it's wrong here
Swap is used when the label is not the router's own.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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