JNCIS-ENT IS IS Practice Question
Which level is enabled by default in Junos when configuring IS-IS on an interface?
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 and Level 2
By default, interfaces in Junos IS-IS are enabled for both Level 1 and Level 2.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
None
Why it's wrong here
You must explicitly enable IS-IS on the interface.
- ✗
Level 2 only
Why it's wrong here
The default is both.
- ✗
Level 1 only
Why it's wrong here
The default is both.
- ✓
Level 1 and Level 2
Why this is correct
Both levels are enabled by default.
About these practice questions
This JNCIS-ENT question is part of Courseiva's 506-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIS-ENT practice question is part of Courseiva's free Juniper Networks 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 JNCIS-ENT exam.