JNCIS-ENT Protocol Independent Routing Practice Question
You are configuring Filter-Based Forwarding (FBF) on an interface. You apply a firewall filter that matches specific source addresses and uses 'then routing-instance' as an action. What must be configured in that target routing instance to ensure return traffic is handled correctly?
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
✓
A default route pointing back to the core gateway within that routing instance's routing table.
Filter-based forwarding only intercepts packets leaving an interface. To ensure traffic can route properly within the target instance and return, routes (such as a default route) must be present in that instance's 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.
- ✓
A default route pointing back to the core gateway within that routing instance's routing table.
Why this is correct
The FBF routing instance must have a valid path to route the packet; otherwise, it will be dropped as a routing black hole.
- ✗
A static ARP entry for every device on the network.
Why it's wrong here
ARP resolution happens dynamically and does not replace the need for routing entries.
- ✗
An RSVP LSP bridging the source and destination instances.
Why it's wrong here
RSVP is not required for basic FBF deployments.
- ✗
A BGP peering session with the loopback address.
Why it's wrong here
BGP is not required for standalone FBF implementations.
Visual reference
About these practice questions
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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.