JNCIP-ENT Interior Gateway Protocols Practice Question
Which THREE parameters must match between two OSPF routers on a shared broadcast segment for an adjacency to successfully form? (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
✓
Router ID
OSPF hello/dead timers, area ID, and authentication parameters must match between neighbors to establish an adjacency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Router ID
Why this is correct
Duplicate Router IDs will prevent adjacencies from forming, and they must be unique within the OSPF domain.
- ✓
Area ID
Why this is correct
Interfaces connected to the same segment must belong to the same OSPF Area ID.
- ✓
Hello and Dead interval timers
Why this is correct
Hello and dead timers must match exactly on both ends of an OSPF interface for neighbors to form adjacencies.
- ✗
Interface MTU size
Why it's wrong here
While MTU mismatch can cause issues in some implementations if strict-mtu is enabled, it is not one of the fundamental mandatory database synchronization checks like Area ID or timers (though Junos ignores MTU by default unless configured).
- ✗
Interface primary IP address subnet
Why it's wrong here
OSPF can form unnumbered or secondary IP adjacencies depending on configuration, though primary subnets usually match. The core required match parameters are Area ID, timers, and authentication.
Visual reference
About these practice questions
Courseiva writes every JNCIP-ENT question from scratch — 336 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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 JNCIP-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 JNCIP-ENT exam.