JNCIS-ENT Protocol Independent Routing Practice Question
An engineer configures an aggregate route for 172.16.0.0/16 on a Junos device. However, the aggregate route is not active in the routing table. What is the primary requirement for an aggregate route to become active?
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
✓
At least one more-specific contributing route must exist in the routing table.
An aggregate route in Junos requires at least one contributing more-specific route present in the routing table to become active.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
An explicit static route matching the aggregate prefix must be configured.
Why it's wrong here
Static routes are not required; contributing routes can come from any routing protocol.
- ✓
At least one more-specific contributing route must exist in the routing table.
Why this is correct
An aggregate route remains inactive unless there is at least one active, more-specific component route matching the aggregate range.
- ✗
A discard policy must be explicitly defined under the aggregate route definition.
Why it's wrong here
While discard is a recommended practice to prevent routing loops, it is not a prerequisite for the aggregate route to become active.
- ✗
The aggregate route must be redistributed using BGP or OSPF.
Why it's wrong here
Redistribution is not required for the aggregate route to activate locally in the routing table.
About these practice questions
This JNCIS-ENT question is part of Courseiva's 519-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.