Introduction of Juniper JN0-421 Exam!

The Juniper JN0-421 exam is a certification exam for Juniper's Automation and DevOps, Specialist (JNCIS-Devops) certification. It is designed to test the knowledge and skills of individuals interested in automating and managing Juniper Networks solutions. The exam covers topics such as Junos automation, automation architecture, automation tools and frameworks, Python scripting, and DevOps principles and practices.

What is the Duration of Juniper JN0-421 Exam?

The Juniper JN0-421 exam is a 90-minute exam consisting of 65 multiple-choice questions.

What are the Number of Questions Asked in Juniper JN0-421 Exam?

There are 60 questions in the Juniper JN0-421 exam.

What is the Passing Score for Juniper JN0-421 Exam?

The passing score required for the Juniper JN0-421 exam is 70%.

What is the Competency Level required for Juniper JN0-421 Exam?

The Juniper JN0-421 exam requires a Professional level of competency, which requires a minimum of two years of networking experience.

What is the Question Format of Juniper JN0-421 Exam?

The Juniper JN0-421 exam consists of 65 multiple-choice questions. Each question has four possible answers, and only one answer is correct.

How Can You Take Juniper JN0-421 Exam?

The Juniper JN0-421 exam can be taken online or in a testing center. The online exam is proctored and monitored by a third-party proctoring service, while the testing center exam is administered by a certified proctor. Both versions of the exam are administered using the same exam content and time limits.

What Language Juniper JN0-421 Exam is Offered?

The Juniper JN0-421 exam is offered in English.

What is the Cost of Juniper JN0-421 Exam?

The Juniper JN0-421 exam costs $199 USD.

What is the Target Audience of Juniper JN0-421 Exam?

The target audience of the Juniper JN0-421 exam is networking professionals who have experience with Juniper Networks products and technologies, including Junos OS, Junos Space, and Junos Security. It is designed for those who want to demonstrate their knowledge and skills in configuring, monitoring, and troubleshooting Juniper Networks products and technologies.

What is the Average Salary of Juniper JN0-421 Certified in the Market?

The average salary of Automation and DevOps-Specialist (JNCIS-DevOps) certified professionals varies widely by role, region, and experience, because it depends on the job the certification is combined with. Check current listings in your market for an up-to-date figure.

Who are the Testing Providers of Juniper JN0-421 Exam?

The Juniper JN0-421 exam is provided by Pearson VUE, an online testing provider. Pearson VUE offers a wide range of exams, including the Juniper JN0-421 exam. To register for the exam, you will need to create an account on the Pearson VUE website and purchase a voucher for the exam. Once you have purchased the voucher, you can schedule your exam online.

What is the Recommended Experience for Juniper JN0-421 Exam?

The recommended experience for the Juniper JN0-421 exam is to have a minimum of one year of experience with Juniper Networks Junos OS and Juniper Networks security technologies. Additionally, it is recommended to have a basic understanding of networking technologies, routing protocols, and security concepts.

What is the Expected Retirement Date of Juniper JN0-421 Exam?

The official website for Juniper JN0-421 exam does not provide any information on the expected retirement date. However, you can check the exam's expiration date on the official Juniper Networks website.

What is the Difficulty Level of Juniper JN0-421 Exam?

The difficulty level of the Juniper JN0-421 exam is considered to be moderate.

What is the Roadmap / Track of Juniper JN0-421 Exam?

The certification roadmap for the Juniper JN0-421 exam consists of the following steps: 1. Complete the Juniper Networks Certified Internet Associate (JNCIA-Junos) exam (JN0-102). 2. Complete the Juniper Networks Certified Internet Professional (JNCIP-Junos) exam (JN0-661). 3. Complete the Juniper Networks Certified Internet Specialist (JNCIS-SEC) exam (JN0-421). 4. Complete the Juniper Networks Certified Internet Expert (JNCIE-SEC) exam (JN0-634).

What are the Topics Juniper JN0-421 Exam Covers?

The Juniper JN0-421 exam covers the following topics: 1. Network Fundamentals: This topic covers the basic principles of network design, including network topologies, addressing and routing protocols, and network security. 2. Junos OS Fundamentals: This topic covers the fundamentals of the Junos operating system, including its architecture and key components. 3. Junos Routing Fundamentals: This topic covers the basics of Junos routing, including static and dynamic routing protocols, routing policy, and routing tables. 4. Junos Security Fundamentals: This topic covers the fundamentals of Junos security, including security policies, firewall filters, and authentication. 5. Junos Automation and DevOps Fundamentals: This topic covers the fundamentals of Junos automation and DevOps, including automation tools, scripting languages, and APIs. 6. Junos Troubleshooting Fundamentals: This topic covers

What are the Sample Questions of Juniper JN0-421 Exam?

1. What is the purpose of the Junos OS command “show route”? 2. What is the purpose of the Junos OS command “show interfaces”? 3. What is the purpose of the Junos OS command “show configuration”? 4. What is the purpose of the Junos OS command “show chassis hardware”? 5. How can you configure a static route in Junos OS? 6. What is the purpose of routing policy in Junos OS? 7. How can you monitor the performance of a Junos OS device? 8. How can you configure a firewall filter in Junos OS? 9. What is the purpose of the Junos OS command “show system processes”? 10. What is the purpose of the Junos OS command “show route protocol”?

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Free JN0-421 – Automation and DevOps-Specialist (JNCIS-DevOps) Practice Test Question

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Showing 1–10 of 10 questions

Question 1

With which three processes does the JET service process communicate? (Choose three)

Select all that apply, then click Submit answer.

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snmpd
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ancpd
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cosd
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mgd
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rpd

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Question 2

You want to enable an unsigned Python op script named inventory.py that will be stored on a local Junos device.

Which two commands are needed to accomplish this task? (Choose two)

Select all that apply, then click Submit answer.

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set system scripts op allow-url-for-python
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set system scripts op file inventory.py
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set system scripts op no-allow-url
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set system scripts language python

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Question 3

You need to reset all Junos systems in your lab to their factory-default state and then push a new configuration to the device.

Which two Ansible modules would your playbook use to accomplish this task? (Choose two)

Select all that apply, then click Submit answer.

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junos_system_services
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junos_zeroize
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junos_get_facts
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junos_install_config

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Question 4

What are three supported languages for operational scripts on Junos devices? (Choose three)

Select all that apply, then click Submit answer.

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Python
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XSLT
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SLAX
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Java
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PHP

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Question 5

Which two statements are correct about JSON characteristics? (Choose two)

Select all that apply, then click Submit answer.

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JSON is a supported template language
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JSON is easy to read for humans and devices
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JSON uses ## for comments
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JSON is programming language independent

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Question 6

Click the Exhibit button.

Exhibit:

You are validating access to a Junos device using NETCONF and receive the response shown below.

Referring to the exhibit, how would you solve this issue?

Select an option, then click Submit answer.

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Enable traceoptions under the NETCONF configuration hierarchy
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Enable protocol-version v1 under the SSH configuration hierarchy
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Enable outbound-ssh with services netconf under the SSH configuration hierarchy
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Enable ssh under the NETCONF configuration hierarchy

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Question 7

Which command is valid for accessing a Junos device using the RESTful API on the default port?

Select an option, then click Submit answer.

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Option A
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Option B
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Option C
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Option D

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Question 8

A customer has a control machine with a default Ansible installation. During execution of an Ansible module against a Junos device, the Ansible control machine generates the

msg: unable to connect to router1.example.com: ConnectRefusedError (router1.example.com) error.

What is the cause for this error?

Select an option, then click Submit answer.

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router1.example.com was not defined in /etc/hosts on the control machine
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Ansible cannot connect to the device through NETCONF
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router1.example.com was not defined in /etc/ansible/inventory/hosts on the control machine
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Ansible cannot authenticate to the device

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Question 9

Which pair of daemons in the Junos OS handle automation?

Select an option, then click Submit answer.

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mgd and jsd
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mgd and JET
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jsd and gRPC
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JET and gRPC

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Question 10

Which statement is true about a Junos ephemeral configuration database?

Select an option, then click Submit answer.

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It can be used to trigger a commit script
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It can be used to reduce commit time
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It can be used to archive previous versions of the ephemeral configuration
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It can be used to validate configuration data semantics

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About the JN0-421 Free Practice Test

Prepare for the Automation and DevOps-Specialist (JNCIS-DevOps) (JN0-421) exam with this free practice test from Study4Pass, built around the real Juniper syllabus. The 10 questions come free from the full 65-question Study4Pass practice set — a quick, honest check of where you stand. The free sample includes 5 single-answer and 5 multiple-answer questions — the same mix of formats you will meet in the full set. The set follows the real exam’s spread of topics: Network Fundamentals, Junos OS Fundamentals, Junos Routing Fundamentals and Junos Security Fundamentals. The Juniper JN0-421 exam is a certification exam for Juniper's Automation and DevOps, Specialist (JNCIS-Devops) certification.

The target audience of the Juniper JN0-421 exam is networking professionals who have experience with Juniper Networks products and technologies, including Junos OS, Junos Space, and Junos Security. The prerequisite for the Juniper JN0-421 exam is to have a valid Juniper Networks Certified Internet Associate (JNCIA) certification.

Certification: Automation and DevOps-Specialist (JNCIS-DevOps) (JN0-421)
Vendor: Juniper
Free on this page: 10 practice questions with answers and explanations
Full practice set: 65 questions

Work through the questions one at a time and read every explanation, even for the ones you get right — the reasoning behind an answer is what the real exam tests. If one area keeps costing you marks, you have found exactly what to revise before exam day.

Think of the result as a map, not a verdict. The questions you miss point straight at the topics that need work, and the explanations tell you why the correct option wins. Candidates who loop through that cycle — practise, review the reasoning, re-test — walk into the real exam having already seen their weak spots and fixed them.

Inside the full JN0-421 practice set:

All 65 questions with answers and explanations
Timed Exam Simulation that mirrors the real exam pressure
Topic Training to drill one domain at a time
Ask AI for More Explanation on every question
Flag questions and review them before you finish

How to use this JN0-421 free practice test

There is no clock and no account needed. Answer each question, check the result, and read the explanation before moving on. For anything that still feels unclear, Ask AI is built into this AI-Enabled practice test — it explains the concept behind the question so the next one like it gets easier. When the free sample feels comfortable, the full set of 65 questions adds timed Exam Simulation, topic-by-topic training, and flagged-question review — the closest thing to exam day you can get before the real thing.

What to study for each JN0-421 domain

Network Fundamentals — This topic covers the basic principles of network design, including network topologies, addressing and routing protocols, and network security.
Junos OS Fundamentals — This topic covers the fundamentals of the Junos operating system, including its architecture and key components.
Junos Routing Fundamentals — This topic covers the basics of Junos routing, including static and dynamic routing protocols, routing policy, and routing tables.
Junos Security Fundamentals — This topic covers the fundamentals of Junos security, including security policies, firewall filters, and authentication.
Junos Automation and DevOps Fundamentals — This topic covers the fundamentals of Junos automation and DevOps, including automation tools, scripting languages, and APIs.

JN0-421 practice test — quick questions

Is this JN0-421 practice test free?

Yes. Every question on this page — all 10 of them — is free to use, and you never need to create an account to try them.

How many questions are in the full JN0-421 set?

The full Study4Pass set for JN0-421 has 65 practice questions. This page gives you 10 of them free so you can judge the quality and difficulty first.

Does the free test show the answers?

Yes. Check any question to reveal the correct answer and its explanation, and use Ask AI whenever you want the underlying concept explained step by step.