350-501 Networking Practice Question
Which IS-IS level is used for routing within an area?
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
✓
Level 1
IS-IS uses Level 1 (L1) for intra-area routing and Level 2 (L2) for inter-area 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.
- ✗
Level 2
Why it's wrong here
L2 is used for routing between areas.
- ✗
Level 0
Why it's wrong here
There is no Level 0 in IS-IS.
- ✗
Level 1/2
Why it's wrong here
L1/L2 routers act as border routers between areas.
- ✓
Level 1
Why this is correct
L1 is used for routing within a single area.
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