350-501 MPLS and Segment Routing Practice Question
A network operator is implementing segment routing (SR-MPLS) using OSPF as the IGP. Which OSPF TLV is used to advertise the Node SID (Prefix SID) for a router's loopback address?
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
✓
Extended Prefix TLV
In OSPF, the Extended Prefix TLV (type 1) carries the Prefix SID sub-TLV for segment routing. The Adjacency SID is carried in the Extended Link TLV.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Router Information TLV
Why it's wrong here
Used for capabilities.
- ✗
Traffic Engineering TLV
Why it's wrong here
Used for TE information.
- ✓
Extended Prefix TLV
Why this is correct
Correct TLV for Prefix SID.
- ✗
Extended Link TLV
Why it's wrong here
That carries Adjacency SID.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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