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Question 1

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In Juniper PyEZ, which class is used to define a Table that retrieves structured data from a Junos operational command output?

OpTable

CfgTable

RunstatTable

CliTable

to track

2026 Statistics

Key Facts: JNCIS-DevOps Exam

JN0-222

Exam Code

Juniper Networks

Exam Questions

Juniper Networks

90 min

Time Limit

Juniper Networks

$300

Exam Fee

Pearson VUE

Specialist

Certification Tier

Juniper Networks

100+

Practice Questions

OpenExamPrep

The JNCIS-DevOps (JN0-222) certifies advanced Junos automation engineers who can implement PyEZ Table/View, NETCONF/gNMI streaming telemetry, Ansible/Salt for Junos, Docker-based tooling, and CI/CD pipelines with JSNAPy validation. It is the Specialist tier in Juniper's DevOps track, above the JNCIA-DevOps associate credential. Juniper recommends 6-12 months of hands-on Junos automation experience and recommends the official JN0-222 study guide and lab environment from the Juniper Learning Portal.

Sample JNCIS-DevOps Practice Questions

Try these sample questions to test your JNCIS-DevOps exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In Juniper PyEZ, which class is used to define a Table that retrieves structured data from a Junos operational command output?

A.OpTable

B.CfgTable

C.RunstatTable

D.CliTable

Explanation: PyEZ uses OpTable (from jnpr.junos.op) to retrieve structured data from Junos operational command output. OpTable definitions use YAML-based View/Table declarations that map XML output fields to Python attributes. CfgTable is used for configuration data, not operational state.

2A PyEZ Table/View definition uses the `item` key set to `bgp-peer`. What does this key specify?

A.The XPath expression identifying each repeating record in the XML response

B.The RPC method name to invoke on the device

C.The Python class name to instantiate for each record

D.The YANG leaf path for the BGP peer container

Explanation: In a PyEZ Table YAML definition, the `item` key specifies the XPath expression (relative to the `get` path) that identifies each repeating record. For example, `item: bgp-peer` means each <bgp-peer> element in the XML response becomes one record in the Table. The View then maps child elements to named attributes.

3Which PyEZ exception class is the base class for all Junos-related errors raised by the PyEZ library?

A.JnprException

B.JnprBaseException

C.ConnectError

D.RpcError

Explanation: JnprBaseException is the base class for all PyEZ-raised exceptions, found in jnpr.junos.exception. Subclasses include ConnectError (connection failures), RpcError (RPC response errors), CommitError (commit failures), and others. Catching JnprBaseException provides a broad safety net for any PyEZ error.

4When using PyEZ with Jinja2 file template loaders, which loader class should be used to load templates from a directory on the filesystem?

A.FileSystemLoader

B.PackageLoader

C.DictLoader

D.BaseLoader

Explanation: Jinja2's FileSystemLoader loads templates from a directory on the local filesystem. In PyEZ workflows you create a jinja2.Environment with FileSystemLoader pointing to your templates directory, then call env.get_template('config.j2') to retrieve and render templates. PackageLoader loads from Python packages, not arbitrary directories.

5In a Junos op script written in SLAX, which function is used to invoke a Junos RPC and return the XML response?

A.jcs:invoke()

B.jcs:execute()

C.jcs:open()

D.jcs:commit()

Explanation: In SLAX op scripts, jcs:execute() is used to send an RPC to the Junos RE and return the XML response. You pass the connection handle (obtained with jcs:open()) and the RPC element as arguments. jcs:invoke() is used in event scripts for simpler invocations without an explicit connection object.

6A Junos commit script needs to prevent a commit if a required interface description is missing. Which SLAX function emits an error that causes the commit to be rolled back?

A.<xnm:error>

B.<xnm:warning>

C.jcs:syslog()

D.<commit-script-results>

Explanation: In a Junos commit script, emitting an <xnm:error> element inside the <commit-script-results> output causes the commit to be rejected and the configuration rolled back. <xnm:warning> allows the commit to proceed but displays a warning message. The distinction is critical for enforcement vs. advisory checks.

7Which Junos configuration database allows changes to be applied immediately without requiring a commit, and is discarded upon reboot?

A.Rescue database

B.Ephemeral configuration database

C.Rollback database

D.Candidate configuration

Explanation: The ephemeral configuration database (introduced in Junos 17.3) accepts configuration changes that take effect immediately without a commit operation. It is stored in memory and does not persist across reboots. This is useful for dynamic, high-frequency configuration updates from automation frameworks where commit overhead must be avoided.

8In a Junos event script, which configuration element defines the conditions that trigger the script to execute?

A.event-options policy

B.event-options generate-event

C.event-options event-script

D.event-options destinations

Explanation: The `event-options policy` stanza defines trigger conditions (which events match) and the corresponding actions, including invoking an event script. The `event-script` stanza under `event-options` merely lists available scripts by filename; the policy ties events to script execution.

9A Junos event script uses event correlators. What is the primary purpose of a correlator in an event policy?

A.To delay script execution by a fixed time interval

B.To aggregate multiple related events into a single trigger context

C.To forward events to a remote syslog server

D.To convert event data into SNMP trap format

Explanation: Event correlators allow multiple event conditions to be combined, requiring all specified events (or any of them, depending on configuration) to occur within a time window before the policy action fires. This prevents false positives from a single event and enables more intelligent, context-aware automation responses.

10Which NETCONF operation is used to copy the running configuration to the startup configuration on a NETCONF-managed Junos device?

A.<copy-config>

B.<commit>

C.<save-config>

D.<validate>

Explanation: The NETCONF <copy-config> operation (RFC 6241) copies a source datastore to a target datastore. Copying from <running/> to <startup/> persists the running config. On Junos, the <commit> RPC also persists configuration, but <copy-config> is the standard NETCONF operation for datastore-to-datastore copy.

About the JNCIS-DevOps Exam

Specialist-level Juniper certification validating advanced Junos automation skills: PyEZ advanced, NETCONF/gNMI/YANG, Ansible, Salt, Docker, CI/CD, and Juniper Apstra REST API.

Questions

65 scored questions

Time Limit

90 minutes

Passing Score

Scaled score (pass/fail)

Exam Fee

$300 (Juniper Networks)

JNCIS-DevOps Exam Content Outline

25%

Junos Automation Scripts

Advanced PyEZ Table/View, factory functions, op/commit/event scripts, SLAX, ephemeral config database

25%

NETCONF, YANG, and Telemetry

NETCONF operations, YANG modeling, OpenConfig, gNMI/gRPC, JTI sensor paths, streaming telemetry

20%

Ansible and Salt for Junos

Ansible roles, idempotency, dynamic inventory, custom modules, Salt proxy minion, reactor, orchestrate

15%

Containers and CI/CD

Docker fundamentals, Dockerfile, Jinja2 advanced, Jenkins, GitLab CI, Git hooks, JSNAPy testing

15%

Juniper Automation Platforms

Juniper Apstra REST API, Paragon Automation, Contrail Networking, workflow orchestration

How to Pass the JNCIS-DevOps Exam

What You Need to Know

Passing score: Scaled score (pass/fail)
Exam length: 65 questions
Time limit: 90 minutes
Exam fee: $300

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

JNCIS-DevOps Study Tips from Top Performers

1Master PyEZ Table/View YAML definitions — understand item, get, view, fields, and factory loading

2Know JnprBaseException subclass hierarchy: ConnectError, RpcError, CommitError, LockError

3Practice gNMI Get vs Subscribe vs Set and SAMPLE vs ON_CHANGE subscription modes

4Understand Ansible variable precedence: defaults < vars < inventory < playbook < extra-vars

5Lab the Salt proxy minion stack: pillar conn_args → junos proxy → salt.modules.junos → PyEZ → NETCONF

Frequently Asked Questions

What is the JNCIS-DevOps exam (JN0-222)?

The JNCIS-DevOps (exam code JN0-222) is the Juniper Networks Certified Specialist DevOps credential. It validates advanced skills in Junos automation including PyEZ, NETCONF/gNMI, Ansible, Salt, Docker, and CI/CD pipeline integration. It sits above the JNCIA-DevOps associate level in Juniper's automation certification track.

What are the prerequisites for JNCIS-DevOps?

Juniper recommends passing the JNCIA-DevOps (JN0-221) associate exam before attempting JNCIS-DevOps. You should also have hands-on experience with PyEZ, NETCONF, Ansible for Junos, and basic Docker knowledge. Juniper recommends 6-12 months of real-world Junos automation experience.

How hard is the JNCIS-DevOps exam?

The JNCIS-DevOps is considered challenging — it requires deep practical knowledge of PyEZ internals (Table/View, factory functions, lxml parsing), YANG data modeling, gNMI subscription modes, Salt proxy minion architecture, and CI/CD pipeline design. Candidates with only theoretical knowledge typically struggle. Hands-on lab experience with real Junos devices or vLabs is strongly recommended.

What topics are covered on the JNCIS-DevOps exam?

The exam covers: PyEZ advanced (Table/View, factory functions, lxml, error handling), op/commit/event scripts with SLAX/Python, ephemeral configuration database, NETCONF operations and datastores, YANG modeling and OpenConfig, gNMI/gRPC and JTI streaming telemetry, Ansible roles and dynamic inventory, Salt proxy minion and reactor, Docker and Dockerfile, Jinja2 advanced filters, CI/CD with Jenkins/GitLab CI, JSNAPy snapshot testing, and Juniper Apstra REST API.

How should I study for the JNCIS-DevOps exam?

Study plan: 1) Complete Juniper's official JN0-222 study guide and Juniper Learning Portal labs. 2) Build hands-on experience with PyEZ by writing Table/View definitions and handling JnprBaseException subclasses. 3) Practice NETCONF with ncclient and gNMI with gNMIc against vSRX or vQFX. 4) Build Ansible playbooks with junipernetworks.junos collection and create Salt proxy minion configs. 5) Complete practice questions to identify gaps.