350-501 Networking Practice Question
A service provider is migrating from OSPF to IS-IS in the core network. They need to support Traffic Engineering and Segment Routing. Which IS-IS TLV must be supported to carry TE information?
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
IS-IS TLV 22 (Extended IS reachability) carries TE metrics and other attributes for traffic engineering. TLVs 128 and 130 are IP reachability TLVs; TLV 135 is for extended IP reachability.
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 130
Why it's wrong here
TLV 130 is IP External Reachability.
- ✓
TLV 22
Why this is correct
TLV 22 (Extended IS reachability) carries TE information including wide metrics.
- ✗
TLV 135
Why it's wrong here
TLV 135 is Extended IP Reachability for IPv4 routes.
- ✗
TLV 128
Why it's wrong here
TLV 128 is IP Internal Reachability, used for IPv4 routes, not TE.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.