350-501 Networking Practice Question
An engineer is configuring IS-IS in a service provider network. The network uses wide metrics for traffic engineering. Which TLV is mandatory for IS-IS to carry traffic engineering (TE) information in accordance with RFC 5305?
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)
TLV 22 (Extended IS Reachability) is the mandatory TLV for IS-IS TE, defined in RFC 5305.
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
TLV 22 carries TE information including link attributes.
- ✗
TLV 135 (Extended IP Reachability)
Why it's wrong here
TLV 135 carries IP prefixes with wide metrics, not TE.
- ✗
TLV 229 (Multi-Topology Reachable IPv4 Prefixes)
Why it's wrong here
TLV 229 is for multi-topology, not TE.
- ✗
TLV 128 (IP Internal Reachability)
Why it's wrong here
TLV 128 is a narrow metric TLV for IP prefixes.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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