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Juniper Certification
JN0-224 Exam
Juniper.JN0-224.v2026-10-29.q22 Dumps

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Question 16

Which two PyEZ object methods are included by default when using a Python context manager? (Choose two.)

A.lock () and unlock (>
B.open() and close()
C.|load() and commit ()
D.pdiff() and diff()

Correct Answer: A,B

When using a Python context manager with Junos PyEZ, two key methods are automatically included:
open() and close(): These methods are used to establish and terminate a connection to a Junos device. When you use a context manager (the with statement), open() is called when entering the block, and close() is called when exiting, ensuring the connection is properly managed.
lock() and unlock(): 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, and unlock() is called at the end, ensuring safe configuration changes.
Supporting Reference:
Junos PyEZ Documentation: The documentation explains how context managers work in PyEZ, including the automatic invocation of open(), close(), lock(), and unlock() methods.

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Question 17

You are asked to write an on-box script that will be triggered when a specific interface on a Junos device goes down.
Which type of on-box script should you use to accomplish this task?

A.commit
B.event
C.operation
D.SNMP

Correct Answer: B

An event script is used to automate responses to system events in Junos, such as an interface going down. These scripts are triggered automatically when a specified event occurs, making them suitable for tasks like monitoring interface status and executing actions when the status changes.
Option B (event) is correct because event scripts are designed for reacting to system events like an interface going down.
Option A (commit) is used for configuration changes, Option C (operation) is used for operational tasks, and Option D (SNMP) is not applicable in this context.
Supporting Reference:
Juniper Networks Event Scripts Documentation: Details how event scripts are used to automate responses to specific system events in Junos

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Question 18

YAML uses which two data structures? (Choose two.)

A.arrays
B.mappings
C.sequences
D.objects

Correct Answer: B,C

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
Detailed Explanation:
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.
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.
Reference:
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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Question 19

Which two processes are used by Junos automation? (Choose two.)

A.mod
B.jsd
C.ifd
D.kmd

Correct Answer: B,D

Junos automation relies on several key processes to handle various automation and API interactions. Let's break down the two key processes involved:
jsd (Junos Script Daemon):
The jsd process is responsible for handling automation scripts, including Python and SLAX scripts, as well as handling JET (Junos Extension Toolkit) API requests. This process is fundamental in the automation framework of Junos, as it deals with external and internal API requests, ensuring that the necessary scripts are executed when specific triggers or events occur.
kmd (Key Management Daemon):
The kmd process is involved in key management for IPsec and other security services. While its primary function is related to managing cryptographic keys, it plays a role in Junos automation by enabling secure communication and ensuring that automation tasks involving security services (such as automated IPsec tunnel creation) are handled securely.
Why the Other Options Are Incorrect:
A . mod: This process doesn't exist as part of the Junos automation framework. It's likely a distractor.
C . ifd: The ifd process is associated with the physical interfaces on the device and does not play a role in automation or script processing.
Reference from Juniper Documentation:
Junos Automation Processes

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Question 20

Which statement about the NETCONF content layer is true?

A.It uses YAML for RPC request and response payloads.
B.It uses XML for RPC request and response payloads.
C.It uses JSON for RPC request and response payloads.
D.It uses HTML for RPC request and response payloads.

Correct Answer: B

The NETCONF protocol, used for network management, utilizes XML for encoding the RPC (Remote Procedure Call) requests and responses. XML is chosen because of its flexibility and ability to represent hierarchical data structures, making it well-suited for representing network configurations and states.
Option B is correct because XML is the standard format used for NETCONF RPC payloads.
Options A (YAML), C (JSON), and D (HTML) are incorrect because these formats are not used by NETCONF for its RPC payloads.
Supporting Reference:
RFC 6241 - NETCONF Protocol: This RFC describes the use of XML for encoding NETCONF messages.

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