JNCIS-ENT Protocol Independent Routing Practice Question
You are troubleshooting a load-balancing configuration across multiple equal-cost paths (ECMP) on a Juniper MX Series router. Traffic is hashing persistently onto only one link. Which action should you take to enable per-packet or per-flow load balancing across the ECMP paths?
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 a routing policy with 'then load-balance' action and apply it to forwarding-options.
By default, Junos performs destination-based forwarding. To enable load balancing across multiple paths, you must explicitly configure a load-balance policy action with per-packet or per-flow load-balancing options.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the router's MTU across all core interfaces.
Why it's wrong here
MTU has no impact on routing path selection or ECMP hash distribution.
- ✗
Enable BGP multipath under protocols bgp.
Why it's wrong here
Multipath applies specifically to BGP routes, whereas general static or OSPF ECMP requires forwarding-table export policies.
- ✓
Configure a routing policy with 'then load-balance' action and apply it to forwarding-options.
Why this is correct
The 'load-balance' action in a routing policy applied via 'export' or 'routing-options forwarding-table' tells Junos to populate the forwarding table with multiple next-hops.
- ✗
Configure a static discard route for the loopback interface.
Why it's wrong here
A discard route will drop traffic rather than load balance it.
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.