350-501 Networking Practice Question
Which THREE of the following are valid IS-IS TLV types used to support traffic engineering and segment routing? (Choose three.)
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
✓
TLV 22 (Extended IS Reachability)
IS-IS TE extensions use various TLVs. TLV 22 (Extended IS Reachability) carries wide metrics and TE information. TLV 135 (Extended IP Reachability) carries IP prefixes with wide metrics. TLV 36 (Prefix SID) is used for segment routing to assign SIDs to prefixes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
TLV 22 (Extended IS Reachability)
Why this is correct
Correct. Used for TE and wide metrics.
- ✗
TLV 2 (IS Neighbors)
Why it's wrong here
Basic adjacency TLV, not for TE/SR.
- ✓
TLV 36 (Prefix SID)
Why this is correct
Correct. Used for segment routing.
- ✓
TLV 135 (Extended IP Reachability)
Why this is correct
Correct. Used for TE and segment routing.
- ✗
TLV 128 (IP Internal Reachability)
Why it's wrong here
This is a TLV for narrow metrics, not for TE/SR.
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