JNCIS-ENT High Availability Practice Question
An engineer wants to configure Nonstop Active Routing (NSR) alongside GRES on an MX204 router running OSPF. What is the primary operational benefit of enabling NSR compared to running GRES alone?
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
✓
NSR synchronizes protocol daemon states between Routing Engines, preventing neighbors from detecting a control plane switchover.
GRES preserves forwarding state during a switchover, but routing protocols must restart and re-converge unless NSR is running, which synchronizes routing protocol states between REs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NSR automatically configures VRRP tracking on all local VLAN interfaces.
Why it's wrong here
VRRP tracking must be configured manually.
- ✗
NSR allows software upgrades to be performed without ever rebooting either Routing Engine.
Why it's wrong here
Software upgrades still require rebooting the REs sequentially; NSR does not eliminate reboots.
- ✓
NSR synchronizes protocol daemon states between Routing Engines, preventing neighbors from detecting a control plane switchover.
Why this is correct
NSR keeps the backup RE fully synchronized with protocol states (like OSPF/BGP), so neighbors see zero disruption and no adjacency drops.
- ✗
NSR replaces LACP negotiation with static member pinning during link failures.
Why it's wrong here
NSR is a routing protocol high-availability feature, unrelated to LACP.
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.