350-501 Networking Practice Question
In IS-IS, which TLV is used to carry traffic engineering information for MPLS-TE?
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
In IS-IS, TLV 22 (Extended IS Reachability) is used to carry traffic engineering information, such as link attributes (bandwidth, admin group, TE metric), for MPLS-TE. TLV 135 (Extended IP Reachability) carries IP prefix information, not TE link attributes.
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 135
Why it's wrong here
TLV 135 is the Extended IP Reachability TLV, used for carrying IP prefix information, not TE link attributes.
- ✗
TLV 229
Why it's wrong here
TLV 229 is not a standard IS-IS TLV for TE; it is associated with Multi-Topology.
- ✓
TLV 22
Why this is correct
TLV 22 (Extended IS Reachability) carries TE information for MPLS-TE, including link attributes like bandwidth and admin group.
- ✗
TLV 128
Why it's wrong here
TLV 128 is an IS-IS TLV for IP addresses, not for TE information.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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