JNCIA-DevOps Junos REST API Practice Question
When troubleshooting Junos REST API integration issues, which THREE factors should an engineer examine if API requests return connection timeouts or refused errors? (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
✓
Whether firewall filters or security zones permit traffic to TCP port 3000 or 3443.
Connection refused or timeouts indicate that jpagent might not be enabled, firewall filters are blocking ports 3000/3443, or management network routing/reachability issues exist.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Whether firewall filters or security zones permit traffic to TCP port 3000 or 3443.
Why this is correct
Firewall filters protecting the Routing Engine can block REST API ports.
- ✗
Whether the BGP routing table has valid routes to external BGP peers.
Why it's wrong here
BGP reachability does not directly cause API connection timeouts to the local management daemon.
- ✓
Network reachability and IP connectivity between the client and the Junos management interface (fxp0 or RE loopback).
Why this is correct
Basic IP reachability is required for HTTP/HTTPS socket establishment.
- ✓
Whether the jpagent service is configured and active on the Junos device.
Why this is correct
If jpagent is disabled, the device will not listen on ports 3000/3443.
- ✗
Whether the NETCONF subsystem script is properly compiled in Python 2.7.
Why it's wrong here
NETCONF and Python version are unrelated to REST API daemon socket connection failures.
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 JNCIA-DevOps 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 JNCIA-DevOps exam.