Question 793 of 1,420
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350-401 Practice Question: Which two statements about MPLS label operations…
Which two statements about MPLS label operations are true? (Choose two.)
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 LSR performs a label push operation.
In MPLS, the ingress LSR pushes a label onto the packet, and transit LSRs swap the incoming label with an outgoing label based on the LFIB. PHP removes the label before the egress LSR, so the egress LSR does not perform a label lookup. The egress LSR forwards based on the IP header after label removal.
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 ingress LSR performs a label push operation.
Why this is correct
Correct because the ingress LSR adds the initial MPLS label to the packet.
- ✓
Transit LSRs perform a label swap operation.
Why this is correct
Correct because transit LSRs replace the incoming label with an outgoing label.
- ✗
The egress LSR performs a label push operation.
Why it's wrong here
Incorrect because the egress LSR removes labels, not pushes them.
- ✗
PHP (Penultimate Hop Popping) causes the egress LSR to pop the label.
Why it's wrong here
Incorrect because PHP causes the penultimate LSR to pop the label, not the egress.
- ✗
The egress LSR always performs an IP lookup after label removal.
Why it's wrong here
Incorrect because after label removal, the egress LSR may forward based on the IP header, but this is not always required (e.g., if the packet is destined to the router itself).
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Last reviewed: Jun 18, 2026
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