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300-410 Practice Question: Which TWO statements about MPLS label imposition…
Which TWO statements about MPLS label imposition (push) 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
✓
Label imposition occurs at the ingress LSR.
Label imposition occurs at the ingress LSR, which pushes a label onto an unlabeled IP packet. The label is based on the FEC (Forwarding Equivalence Class) derived from the IP destination. The egress LSR pops the label, not imposes it.
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 imposition occurs at the ingress LSR.
Why this is correct
The ingress LSR pushes a label onto an incoming IP packet to begin MPLS forwarding.
- ✗
Label imposition occurs at the egress LSR.
Why it's wrong here
The egress LSR pops the label, not imposes it.
- ✓
The imposed label is determined by the Forwarding Equivalence Class (FEC).
Why this is correct
The FEC maps the IP prefix to a label, which is then pushed onto the packet.
- ✗
The imposed label is always the top label in a label stack.
Why it's wrong here
While the imposed label becomes the top label, this statement is not always true in all contexts (e.g., when pushing multiple labels). However, in basic MPLS, it is the top label, but the key point is that it is determined by FEC.
- ✗
Label imposition is performed using the 'tag-switching' command.
Why it's wrong here
There is no such command; label imposition is automatic based on MPLS configuration and routing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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