350-501 Networking Practice Question
An SP network engineer configures IS-IS with wide metrics. Which statement is true about IS-IS wide metrics compared to narrow metrics?
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 Type-Length-Value (TLV) extensions to carry traffic engineering information.
Wide metrics use a 24-bit field, allowing values up to 16,777,215, and support TE extensions and segment routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Narrow metrics are required for IPv6 routing in IS-IS.
Why it's wrong here
IPv6 routing requires wide metrics for TLVs.
- ✓
Wide metrics use Type-Length-Value (TLV) extensions to carry traffic engineering information.
Why this is correct
Wide metrics use TLV 135 and 236 for TE.
- ✗
Wide metrics are only supported in Level 1 routing.
Why it's wrong here
Wide metrics are supported in both L1 and L2.
- ✗
Narrow metrics support up to 63 cost values, while wide metrics support up to 255.
Why it's wrong here
Narrow metrics are 6-bit, max 63; wide metrics are 24-bit.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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