Juniper JNCIA-DevOps Sample Questions & Practice Test

JNCIA-DevOps is an automation route for candidates who need network automation fundamentals, Juniper APIs, NETCONF, REST, Python, Ansible, Git workflow, telemetry, and safe operational change.

Use this page to try original IT Mastery sample questions on automation decisions. They are not official Juniper exam questions.

What these questions test

• choosing automation methods such as NETCONF, REST, Ansible, Python, and templates for practical tasks
• validating network changes before broad deployment
• distinguishing configuration generation, state collection, telemetry, and version control responsibilities
• keeping automation safe through idempotence, review, testing, and rollback planning

Sample Exam Questions

Question 1

Topic: automation fit

Which task is a good candidate for network automation?

• A. Guessing passwords
• B. Repeatedly applying a standard interface template across many devices
• C. Replacing change review entirely
• D. Ignoring device state before changes

Best answer: B

Explanation: Repetitive, structured work with clear inputs is a strong automation candidate. Automation should still include review, validation, and rollback planning.

Question 2

Topic: idempotence

Why is idempotence useful in automation?

• A. Running the same automation repeatedly should not create unintended extra changes
• B. It makes all changes manual
• C. It disables logs
• D. It requires every command to fail once

Best answer: A

Explanation: Idempotent automation converges to a desired state without repeating side effects. This is important for reliable network configuration management.

Question 3

Topic: NETCONF

What is NETCONF commonly used for?

• A. User spreadsheet formatting
• B. Wireless signal amplification
• C. Replacing all routing protocols
• D. Programmatic network device configuration and state retrieval using structured data

Best answer: D

Explanation: NETCONF provides structured mechanisms for device configuration and operational data. It supports automation better than screen-scraping CLI output.

Question 4

Topic: REST APIs

When is a REST API useful in network operations?

• A. Only when no authentication exists
• B. To avoid validating changes
• C. When an application needs to interact with a service through HTTP-based structured requests
• D. To make configuration impossible

Best answer: C

Explanation: REST APIs expose resources through structured HTTP interactions. They are useful for platforms and services that support API-driven operations.

Question 5

Topic: Ansible

What is a common Ansible advantage for network automation?

• A. It requires every operator to memorize binary formats
• B. Declarative playbooks can describe repeatable tasks across devices
• C. It prevents version control
• D. It can only manage one device forever

Best answer: B

Explanation: Ansible playbooks can standardize and repeat operational tasks. They should be stored, reviewed, and tested like other automation assets.

Question 6

Topic: Python scripts

A Python script changes device configuration. What should it include before production use?

• A. Input validation, error handling, logging, dry-run or test behavior, and rollback planning
• B. Hardcoded shared administrator passwords
• C. No exception handling
• D. Random sleeps instead of checking results

Best answer: A

Explanation: Automation can create fast mistakes. Scripts need validation, clear errors, logging, test paths, and rollback plans before production execution.

Question 7

Topic: Git workflow

Why store network templates in Git?

• A. To remove all approvals
• B. To encrypt every packet
• C. To make device backups unnecessary
• D. To track changes, review history, support collaboration, and roll back versions

Best answer: D

Explanation: Version control gives traceability and review for automation assets. It does not replace backups, approvals, or device-state validation.

Question 8

Topic: telemetry

What is telemetry intended to support?

• A. Manual typing of every show command forever
• B. Disabling monitoring
• C. Continuous or structured visibility into device and network state
• D. Replacing incident response

Best answer: C

Explanation: Telemetry provides structured operational data for monitoring, alerting, and analytics. It helps teams detect change and troubleshoot with evidence.

Question 9

Topic: data formats

Why are JSON or XML useful in automation?

• A. They make all networks wireless
• B. They provide structured data that software can parse reliably
• C. They prevent authentication
• D. They are only for slide decks

Best answer: B

Explanation: Structured data is easier for programs to parse than human-oriented CLI text. NETCONF, REST, and automation tools often rely on structured formats.

Question 10

Topic: safe deployment

What is a safer way to roll out an automation change?

• A. Push to every device without review
• B. Disable monitoring first
• C. Hide the change from the operations team
• D. Test in a lab or limited scope, validate results, then expand gradually

Best answer: D

Explanation: Safe automation uses staged rollout, validation, and monitoring. Broad unaudited pushes increase outage risk.

Question 11

Topic: secrets

How should automation handle credentials?

• A. Use approved secrets management or protected variables rather than hardcoding secrets in scripts
• B. Commit passwords to public repositories
• C. Put all credentials in interface descriptions
• D. Share one password in chat

Best answer: A

Explanation: Automation must protect credentials. Secrets should be handled through approved secure mechanisms, not embedded in public code or shared insecurely.

Question 12

Topic: state validation

After automation applies a change, what should happen next?

• A. Assume success because the script ended
• B. Delete all logs
• C. Validate the intended state and key service health
• D. Disable alerting

Best answer: C

Explanation: Automation completion is not the same as service success. Post-checks confirm configuration and operational outcomes.

Quick readiness checklist

JNCIA-DevOps practice update

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