JNCIS-ENT Protocol Independent Routing Practice Question
Which THREE characteristics are true regarding Junos aggregate routes? (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
✓
They require at least one active, more-specific contributing route to become active.
Aggregate routes summarize multiple routes, are assigned a default preference of 130, and remain inactive unless at least one more-specific contributing route is present in the routing table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
They automatically drop matching traffic by installing a discard next-hop when no contributing routes exist.
Why it's wrong here
Aggregate routes do not automatically install a discard next-hop unless explicitly configured with the 'discard' option.
- ✓
They require at least one active, more-specific contributing route to become active.
Why this is correct
An aggregate route is inactive without contributing routes.
- ✓
They can include component routes from any routing protocol or static configuration.
Why this is correct
Any active route in the routing table can contribute to an aggregate route regardless of its source protocol.
- ✓
They are assigned a default route preference of 130.
Why this is correct
Aggregate routes have a default preference of 130 in Junos.
- ✗
They dynamically adjust their prefix length based on the subnet mask of the primary physical interface.
Why it's wrong here
Aggregate route prefix lengths are statically defined by the administrator.
About these practice questions
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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.