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
✓
At the ingress LSR, a label is pushed onto the packet.
At the ingress, a label is pushed; at the egress, the label is popped. Swap occurs at intermediate routers.
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 operations are performed based on the IP destination address.
Why it's wrong here
MPLS forwarding is label-based.
- ✓
At the ingress LSR, a label is pushed onto the packet.
Why this is correct
Correct. The ingress adds the label.
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At the ingress LSR, the label is popped.
Why it's wrong here
Ingress pushes.
- ✗
At the egress LSR, a label is swapped.
Why it's wrong here
Egress pops the label.
- ✓
At an intermediate LSR, a label is swapped.
Why this is correct
Correct. Swap occurs in the core.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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