JNCIS-ENT OSPF Practice Question
You are configuring OSPF on a Junos device and notice that Type 3 LSAs are not being generated or propagated into a specific area. When examining the configuration under protocols ospf, you see that the area is defined with the no-summaries parameter. Which area type has been configured?
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
✓
Totally Stubby Area
In Junos OS, the 'no-summaries' parameter under 'set protocols ospf area' defines a Stub area as a totally stubby area, which suppresses Type 3 summary LSAs from being injected into the area by the ABR.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Not-So-Stubby Area (NSSA)
Why it's wrong here
NSSAs use the 'nssa' statement and allow external routes via Type 7 LSAs.
- ✗
Transit Area
Why it's wrong here
Transit areas (like the backbone) carry inter-area and external traffic and do not block summaries.
- ✗
Standard OSPF Area
Why it's wrong here
Standard areas accept all LSA types including Type 3 summaries and external Type 5 LSAs.
- ✓
Totally Stubby Area
Why this is correct
The 'no-summaries' option configures a totally stubby area, blocking Type 3, 4, and 5 LSAs.
Visual reference
About these practice questions
One of 506 original JNCIS-ENT practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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.