JNCIS-ENT OSPF Practice Question
An administrator needs to configure an OSPF stub area on a Juniper router. Which THREE characteristics apply to a standard OSPF stub area? (Choose three.)
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
✓
The ABR injects a default route (0.0.0.0/0) into the area
Standard stub areas block Type 5 AS-external LSAs and Type 4 summary LSAs, using a default route generated by the ABR to reach external destinations instead.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Type 3 summary LSAs are blocked from entering the area
Why it's wrong here
Type 3 summary LSAs are permitted in a standard stub area; they are only blocked in totally stubby areas.
- ✓
The ABR injects a default route (0.0.0.0/0) into the area
Why this is correct
Stub ABRs automatically originate a default route to replace external routes.
- ✓
Type 5 AS-external LSAs are blocked from entering the area
Why this is correct
Stub areas do not allow external Type 5 LSAs.
- ✓
Virtual links are not permitted to transit through a stub area
Why this is correct
OSPF transit areas for virtual links cannot be configured as stub areas.
- ✗
ASBRs are permitted to reside directly inside the stub area
Why it's wrong here
ASBRs are not allowed inside stub areas because external routes cannot be advertised.
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.