Juniper Automation and DevOps Associate (JNCIA-DevOps) JN0-223 Exam Dumps: Updated Questions & Answers (October 2025)

Two important aspects of the DevOps culture are:

Communication (A): In a DevOps environment, continuous and effective communication between development, operations, and other stakeholders is crucial. It ensures that everyone is aligned, reduces misunderstandings, and facilitates faster and more efficient workflows.

People (D): DevOps is as much about the people as it is about the processes and tools. The culture emphasizes collaboration, shared responsibility, and a mindset focused on continuous improvement. Empowering people to work together across different disciplines is at the heart of DevOps.

Options B and C are not primary aspects of the DevOps culture. While tools are essential in implementing DevOps practices, the culture emphasizes communication and collaboration among people more than the use of specific tools or rigid separation of duties.

DevOps Handbook: Discusses the cultural aspects of DevOps, with a focus on communication and people.

DevOps Best Practices: Highlights the importance of fostering a culture that prioritizes collaboration and shared goals.

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YAML (YAML Ain't Markup Language) primarily uses two data structures:

Mappings: These are key-value pairs, similar to dictionaries or hashes in programming languages. In YAML, mappings are used to represent associative arrays or objects. They are defined with a colon (:) separating the key from the value.

Example:

key: value

name: John Doe

Sequences: These are ordered lists of items, equivalent to arrays or lists in other programming languages. Sequences in YAML are denoted by a dash (-) followed by a space and then the item.

Example:

fruits:

- Apple

- Banana

- Cherry

Mappings(B) allow you to define relationships between keys and values, making it possible to represent more complex data structures like dictionaries or objects.

Sequences(C) allow you to represent ordered collections, which is important for listing elements that must maintain a specific order.

Detailed Explanation:YAML is often used in configuration files and data serialization in DevOps environments, such as in Ansible playbooks, Kubernetes manifest files, and CI/CD pipeline definitions.Its simplicity and human-readable format make it a popular choice for these applications.

YAML Official Documentation: YAML's specification outlines these core data structures.

Juniper Automation and DevOps Documentation: Provides best practices for using YAML in network automation scripts and configuration management.

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In Junos OS, acommit scriptis an on-box automation script that runs every time a configuration change is committed. Commit scripts are used to enforce configuration policies, validate configuration changes, or make automatic adjustments to configurations when certain conditions are met.

Commit Script (C): Executes automatically during the commit process, ensuring that the new configuration adheres to specific rules or conventions before it is applied to the system.

Event, SNMP, and operation scriptsare used for other purposes in Junos automation but do not run automatically with every configuration change.

Junos OS Automation Scripts Guide: Provides details on different types of scripts, including commit scripts, and their use cases.

Juniper Networks Documentation: Offers examples and best practices for creating and using commit scripts.

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A commit script in Junos is used to enforce policies and configuration constraints on the device. These scripts are written in Extensible Stylesheet Language Transformations (XSLT) or Python and are executed automatically during the commit process of a configuration change.

In this context, to prevent the deletion of the SNMP configuration, a commit script is the appropriate choice. It can be designed to check the configuration changes being committed and reject any commit that attempts to delete or modify the SNMP configuration. This script essentially acts as a gatekeeper, ensuring that only allowable changes are committed to the device configuration.

Supporting References:

Juniper Networks Commit Scripts Documentation:The official Juniper documentation provides examples and use cases of commit scripts, including how they can be used to prevent unauthorized changes to the device configuration.

"Junos Automation Scripting"by Jonathan Looney: This resource gives practical examples and best practices for creating commit scripts to enforce configuration policies in Junos OS.

A. The Junos REST API client is on-box:The Junos REST API ison-box, meaning it is hosted directly on the Junos OS device. This allows you to interact with the device through RESTful API calls without needing an external client to act as an intermediary. With the on-box REST API, users can manage and automate configuration and operational tasks directly from the Junos device itself using HTTP/HTTPS protocols. This simplifies automation and remote management since the API server is embedded within the device.

Key Automation Capabilities of On-box REST API:

Supports configuration, monitoring, and operational commands.

Allows for direct device interaction via tools like curl, or through custom-built automation scripts.

NETCONF (Network Configuration Protocol) operates through different layers, with the operations layer being particularly important for managing configurations:

Operations Layer (A & D): This layer is responsible for actions like locking and committing the configuration on a Junos device. The lock operation prevents other sessions from modifying the configuration, and the commit operation applies the configuration changes to the device.

Options B and Care incorrect because the messages layer handles the communication aspects, such as exchanging data between the client and server, not performing configuration operations like locking and committing.

IETF RFC 6241 (NETCONF): Describes the protocol layers and their functions, with a focus on the operations layer.

Juniper Networks NETCONF Documentation: Provides insights into how NETCONF operations are managed in Junos

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When using a Python context manager with Junos PyEZ, two key methods are automatically included:

open()andclose(): These methods are used to establish and terminate a connection to a Junos device. When you use a context manager (thewithstatement),open()is called when entering the block, andclose()is called when exiting, ensuring the connection is properly managed.

lock()andunlock(): These methods are used to lock the configuration database to prevent other users from making changes while you are working on it. When using a context manager,lock()is called at the start of the block, andunlock()is called at the end, ensuring safe configuration changes.

Supporting References:

Junos PyEZ Documentation:The documentation explains how context managers work in PyEZ, including the automatic invocation ofopen(),close(),lock(), andunlock()methods.

Junos on-box scripting supports the following programming languages:

SLAX (C): SLAX (Structured Language for XML) is a scripting language designed specifically for Junos devices. It allows for easy manipulation of XML data, making it ideal for creating Junos scripts that interact with device configurations.

XSLT (D): XSLT (Extensible Stylesheet Language Transformations) is another language used for transforming XML documents into other formats. It is commonly used in Junos for transforming XML data into different views or outputs.

Options A (Perl) and B (Ruby) are not used for Junos on-box scripting.While these languages are popular in other contexts, Junos scripting relies heavily on XML-based languages like SLAX and XSLT.

Junos XML API and Scripting Guide: Describes the use of SLAX and XSLT for on-box scripting.

Juniper Networks Automation Documentation: Provides examples and best practices for using SLAX and XSLT in Junos scripting.

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