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300-410 Practice Question: Statements about MPLS label imposition and…
Which of the following statements about MPLS label imposition and disposition is true?
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 ingress LER performs the label push operation, and the egress LER performs the label pop operation unless PHP is used.
In MPLS, the ingress LER (Label Edge Router) imposes a label on the packet (push operation). The egress LER removes the label (pop operation). The penultimate hop router may perform penultimate hop popping (PHP) to remove the label before the egress, reducing the egress's workload.
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 egress LER always performs the label pop operation.
Why it's wrong here
With PHP, the penultimate hop router pops the label, so the egress receives an unlabeled packet.
- ✓
The ingress LER performs the label push operation, and the egress LER performs the label pop operation unless PHP is used.
Why this is correct
Standard MPLS operation: ingress pushes, egress pops. PHP allows the penultimate hop to pop, so the egress does not need to.
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The penultimate hop router always pushes an additional label.
Why it's wrong here
The penultimate hop pops, not pushes, in PHP.
- ✗
Label disposition occurs only at the ingress LER.
Why it's wrong here
Label disposition (pop) occurs at the egress or penultimate hop, not ingress.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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