350-501 MPLS and Segment Routing Practice Question
In SR-MPLS, when a router receives a packet with an MPLS label corresponding to an Adjacency SID, what operation does it perform?
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
✓
It pops the label and forwards the packet out of the specific interface.
An Adjacency SID represents a specific link; when a router receives a packet with that label, it pops the label and forwards the packet out of the associated interface, because the Adjacency SID is a 'penultimate hop popping' type of SID.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It pops the label and forwards the packet out of the specific interface.
Why this is correct
Correct: The label is popped and packet forwarded on the corresponding link.
- ✗
It performs a recursive lookup in the FIB to determine the next hop.
Why it's wrong here
Not needed; the label directly identifies the outgoing interface.
- ✗
It pushes an additional label and forwards.
Why it's wrong here
Pushing is done at the headend, not at the adjacency SID node.
- ✗
It swaps the label with the next-hop label and forwards.
Why it's wrong here
Swapping is typical for Prefix-SIDs, not Adjacency-SIDs.
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