JNCIS-ENT OSPF Practice Question
A Junos router running OSPF is configured with graceful restart helper mode enabled. What is the primary role of an OSPF graceful restart helper router during a control plane restart of a neighboring router?
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
✓
To maintain neighbor adjacencies and continue forwarding packets without recalculating the SPF tree while the neighbor restarts
Helper routers continue forwarding traffic based on existing routes and assist the restarting router by maintaining adjacencies and suppressing LSA re-origination until the restarting control plane recovers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To translate Type 7 LSAs into Type 5 LSAs during the helper window
Why it's wrong here
Incorrect. This is an NSSA ABR function, unrelated to graceful restart.
- ✓
To maintain neighbor adjacencies and continue forwarding packets without recalculating the SPF tree while the neighbor restarts
Why this is correct
Correct. Helper mode maintains forwarding and holds adjacency state during a peer's restart.
- ✗
To purge all LSAs originated by the restarting router from the LSDB
Why it's wrong here
Incorrect. Purging LSAs would disrupt traffic; helper mode specifically prevents this.
- ✗
To take over the role of Designated Router immediately upon detecting control plane failure
Why it's wrong here
Incorrect. Helper mode does not alter DR/BDR election logic or force immediate takeover.
Visual reference
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.