350-501 Networking Practice Question
In IS-IS, a router is configured as L1 only. Which statement is true regarding its routing table?
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
✓
It has a default route pointing to the nearest L1/L2 router.
An L1 router only knows routes within its own area. It uses the closest L1/L2 router as a default route to reach other areas. The L1/L2 router leaks a default route into the L1 area.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It learns all L2 routes from the backbone.
Why it's wrong here
L1 routers do not participate in L2 routing.
- ✓
It has a default route pointing to the nearest L1/L2 router.
Why this is correct
Correct. The L1/L2 router advertises a default route into L1 area.
- ✗
It learns inter-area routes via L1 LSPs.
Why it's wrong here
L1 LSPs only contain intra-area information.
- ✗
It only uses narrow metrics.
Why it's wrong here
Metric style is independent of L1/L2 capability.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.