JNCIS-ENT IS IS Practice Question
An engineer needs to influence the DIS election on a multi-access broadcast segment running IS-IS on Junos devices. Which configuration parameter and hierarchy should the engineer modify to guarantee a specific router wins the DIS election?
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
✓
Configure 'set protocols isis interface <name> priority <value>' where a higher value wins.
DIS priority in Junos IS-IS is configured under the interface hierarchy using 'set protocols isis interface <interface-name> priority <value>'. Higher priority wins; default is 64, max is 127.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure 'set protocols isis reference-bandwidth <value>' globally.
Why it's wrong here
Reference bandwidth affects calculated metric values for wide metrics, not DIS election.
- ✗
Configure 'set protocols isis lsp-interval <value>' to speed up PDU transmission.
Why it's wrong here
LSP transmission interval controls LSP pacing, not the DIS election.
- ✓
Configure 'set protocols isis interface <name> priority <value>' where a higher value wins.
Why this is correct
The DIS priority ranges from 0 to 127, with the default being 64. The router with the highest priority is elected DIS.
- ✗
Configure 'set protocols isis level <1|2> metric <value>' to lower the interface cost.
Why it's wrong here
IS-IS metric values affect path selection, but have no impact on the DIS election process.
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.