350-501 MPLS and Segment Routing Practice Question
An engineer is configuring MPLS on a Cisco router. Which label operation is performed on the ingress LSR when a packet enters the MPLS domain?
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
✓
Push a new label
The ingress LSR pushes a new label onto the stack, encapsulating the original IP packet with an MPLS 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 it's wrong here
Pop is performed by the penultimate hop LSR.
- ✓
Push a new label
Why this is correct
Push is performed by the ingress LSR.
- ✗
No label operation
Why it's wrong here
An operation must occur on the ingress LSR.
- ✗
Swap the top label
Why it's wrong here
Swap is performed by transit LSRs.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 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 350-501 exam.