20+ practice questions focused on Junos REST API — one of the most tested topics on the Juniper Networks Automation and DevOps, Associate (JNCIA-DevOps, JN0-224) (JNCIA-DevOps) exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Junos REST API PracticeAn administrator wishes to secure their Junos REST API connections by configuring HTTPS instead of plain HTTP. Which command under 'system services jpagent' accomplishes this?
Explanation: To enable HTTPS for the Junos REST API agent, the administrator must configure the 'https' option under 'set system services jpagent'.
Which service daemon must be explicitly enabled in the Junos CLI configuration to allow REST API requests to be processed by the routing engine?
Explanation: The Junos REST API is managed by the 'jpagent' (Junos Plugin Agent) service. It must be enabled under the 'system services' hierarchy for REST API requests to function.
An automation engineer is trying to retrieve operational data from a Junos device using the REST API. They send an HTTP GET request to the URI path 'http://192.168.1.1:3000/api/font/operational/system/information', but the request fails with a 404 Not Found error. What is the cause of this failure?
Explanation: The correct base path for Junos REST API operational data uses 'rpc' or 'initial' or specific resource endpoints like /api/restful/rit/rpc, but the standard path prefix for RPCs and operational data via the Junos REST API begins with /api/operational/ rather than /api/font/operational/.
When comparing NETCONF and the Junos REST API workflows, which statement accurately describes how configuration locks are handled?
Explanation: NETCONF explicitly requires lock and unlock operations on configuration datastores (candidate/running). The Junos REST API abstracts state management or handles implicit locking depending on the specific API call, whereas NETCONF leaves lock management entirely to the client's explicit RPC control.
An engineer needs to modify a configuration parameter using the Junos REST API via an HTTP PUT request. They include the Content-Type header as 'application/json'. However, the device rejects the payload. What is the correct Content-Type or Accept header requirement for configuration manipulation payload representation in Junos REST API?
Explanation: Junos REST API supports both JSON and XML representations. When sending configuration payloads, the Content-Type must match the format being transmitted, such as application/vnd.juniper.netconf.config+json or application/json depending on the API version, but application/vnd.juniper.netconf.config+json is specifically designed for structural configuration mapping.
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Practice all Junos REST API questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Junos REST API. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Junos REST API questions on the JNCIA-DevOps frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Junos REST API is tested as part of the Juniper Networks Automation and DevOps, Associate (JNCIA-DevOps, JN0-224) (JNCIA-DevOps) blueprint. Practicing with targeted Junos REST API questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Junos REST API is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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