JNCIS-ENT IS IS Practice Question
An administrator is configuring a new point-to-point link between two Junos routers running IS-IS. By default, how does IS-IS handle adjacency establishment on a point-to-point link compared to a broadcast link?
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
✓
It uses a 3-way handshake TLV in IIH packets and bypasses the DIS election process entirely.
On point-to-point links, IS-IS uses the 3-way handshake extension (RFC 5303) via IIH packets to verify bidirectional connectivity without holding a DIS election.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It uses a 3-way handshake TLV in IIH packets and bypasses the DIS election process entirely.
Why this is correct
Point-to-point links do not require a DIS. They use the 3-way handshake mechanism to ensure reliable adjacency formation.
- ✗
It relies strictly on CSNPs sent every 10 seconds to establish the adjacency.
Why it's wrong here
CSNPs are database synchronization tools on broadcast networks, not adjacency establishment mechanisms.
- ✗
It requires manual mapping of neighbor system IDs using static ARP bindings.
Why it's wrong here
IS-IS adjacencies are formed dynamically through IIH packet exchanges.
- ✗
It initiates a DIS election using priority values identical to broadcast segments.
Why it's wrong here
DIS election does not take place on point-to-point links.
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.