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350-401 Practice Question: Drag and drop the steps of PHP (Penultimate Hop…

Drag and drop the steps of PHP (Penultimate Hop Popping) operation into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

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

✓

Egress LSR assigns implicit-null label (3) to FEC

PHP begins with egress LSR assigning implicit-null label (3) to FEC, advertising it upstream, penultimate LSR popping the label, forwarding the IP packet without label, and egress LSR performing IP lookup.

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Same concept, more angles

1 more way this is tested on 350-401

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Drag and drop the steps of PHP (Penultimate Hop Popping) operation into the correct order, from first to last.

medium
  • ✓ A.Egress LSR assigns label to FEC
  • ✓ B.Egress advertises implicit-null label to penultimate hop
  • ✓ C.Penultimate hop receives label advertisement
  • ✓ D.Penultimate hop pops the MPLS label
  • ✓ E.Egress receives IP packet and routes normally

Why A: PHP operation begins with the egress LSR assigning a label to a FEC and advertising it. The penultimate hop receives this label and recognizes implicit-null. The penultimate hop then pops the label before forwarding the packet. The egress receives an unlabeled packet and performs a standard IP lookup.

JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 350-401 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 350-401 exam.