JNCIS-ENT OSPF Practice Question
During OSPF database synchronization, two Junos routers exchange Database Description (DBD) packets. One router repeatedly sends DBD packets with the master/slave bit set incorrectly or encounters sequence number mismatches, causing the adjacency to loop in the Exchange state. Which OSPF packet type is immediately sent by a router to request missing link-state information once the ExStart/Exchange transition completes?
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
✓
Link-State Request (Type 3)
Once DBD exchange completes and master/slave negotiation finishes, routers transition to the Loading state and use Link-State Request (LSR) packets (Type 3) to request more detailed or missing LSAs from their neighbor.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Link-State Request (Type 3)
Why this is correct
Correct. LSR packets are used to request specific LSAs identified during the DBD exchange phase.
- ✗
Hello (Type 1)
Why it's wrong here
Incorrect. Hello packets are used for neighbor discovery, not database synchronization requests.
- ✗
Database Description (Type 2)
Why it's wrong here
Incorrect. DBD packets are used earlier during the Exchange state to summarize LSDB contents.
- ✗
Link-State Update (Type 4)
Why it's wrong here
Incorrect. LSUs carry the advertised LSAs, but are sent in response to LSRs or triggered by topology changes.
Visual reference
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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 →
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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.