350-501 MPLS and Segment Routing Practice Question
Which TWO statements about MPLS label operations are correct? (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
✓
Label swapping is performed at every transit LSR.
Penultimate Hop Popping (PHP) removes the label before the final hop, and the ingress LSR pushes the initial label.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Label swapping is performed at every transit LSR.
Why this is correct
Transit LSRs swap the incoming label with an outgoing label.
- ✓
In PHP, the penultimate hop LSR removes the top label before forwarding to the egress.
Why this is correct
PHP reduces load on the egress.
- ✗
The ingress LSR performs a swap operation.
Why it's wrong here
Ingress pushes, not swaps.
- ✗
The egress LSR always performs a pop operation.
Why it's wrong here
The egress LSR receives an IP packet if PHP is used; if not, it pops but typically PHP is used.
- ✗
Label popping always happens at the penultimate hop.
Why it's wrong here
PHP is typical but not mandatory; explicit null may be used.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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