350-501 Networking Practice Question
A service provider is deploying IS-IS with wide metrics to support traffic engineering. Which two statements about IS-IS wide metrics are correct?
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
✓
Wide metrics use TLV 135 for extended IS reachability.
Wide metrics use a 24-bit or 32-bit field, allowing values up to 16,777,215 or more, and are backward compatible with narrow metrics via apportioning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Wide metrics are required for segment routing.
Why it's wrong here
Segment routing can use either wide or narrow metrics, but wide is recommended.
- ✗
Wide metrics are incompatible with narrow metrics and require a full migration.
Why it's wrong here
Wide metrics are backward compatible with narrow metrics using apportioning.
- ✓
Wide metrics use TLV 135 for extended IS reachability.
Why this is correct
TLV 135 carries wide metrics for IS-IS.
- ✗
Narrow metrics can only be used with L1 routing.
Why it's wrong here
Narrow metrics can be used in both L1 and L2.
- ✓
Wide metrics support values up to 16,777,215.
Why this is correct
Wide metrics use 24-bit fields for link metrics, supporting up to 16,777,215.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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