JNCIS-ENT OSPF Practice Question
During the establishment of an OSPF adjacency, two routers exchange Database Description (DBD) packets. What is the primary purpose of the DBD packet exchange in the OSPF protocol sequence?
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 synchronize link-state database summaries between neighbors
DBD packets contain a summary of the link-state database (LSDB), listing the headers of each LSA. This allows receiving routers to compare their local LSDBs and request missing or more recent LSAs using Link State Request (LSR) packets.
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 synchronize link-state database summaries between neighbors
Why this is correct
DBD packets provide a summary of the LSDB so routers can identify missing entries.
- ✗
To discover directly connected neighbors on a shared segment
Why it's wrong here
Neighbor discovery is performed using OSPF Hello packets.
- ✗
To request specific missing LSAs from a neighbor's database
Why it's wrong here
LSR packets are used to request specific LSAs identified during the DBD exchange.
- ✗
To explicitly acknowledge the receipt of specific LSA updates
Why it's wrong here
Explicit acknowledgments are handled by Link State Acknowledgment (LSAck) packets.
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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.