JN0-224 Exam Questions and Answers | Exam-Dumps (Page: 2)

QUESTION: 9

Which DevOps "Three way" principle addresses technical debt?

feedback
flow
continuous experimentation and learning
continuous experimentation

Answer(s): A

Explanation:

In the context of the DevOps "Three Ways" principles, the feedback principle directly addresses the management of technical debt.

The "Three Ways" are core principles guiding DevOps practices, and they are as follows:

Flow: Refers to the smooth and fast flow of work through the system, from development to operations.

Feedback: Emphasizes creating effective, fast, and continuous feedback loops between teams to catch issues early, address technical debt, and ensure quality.

Continuous experimentation and learning: Encourages constant experimentation, innovation, and learning from failures to improve systems and processes over time.

Feedback and Technical Debt:

Feedback loops play a crucial role in addressing technical debt. Technical debt refers to the implied cost of additional work that arises when code or system design decisions are made for short-term gains, such as quick fixes or temporary patches. Over time, technical debt can accumulate and degrade system performance, reliability, and maintainability.

The feedback loop ensures that issues related to technical debt (such as poor code quality, design shortcuts, or performance bottlenecks) are caught early in the process, ideally before they become major problems. Continuous monitoring, testing, and reviewing help identify and resolve technical debt incrementally rather than letting it accumulate unchecked.

Automation in feedback loops: In DevOps, automated testing, continuous integration (CI), and monitoring tools provide immediate feedback to developers, highlighting areas where technical debt is increasing. This feedback is crucial for making proactive decisions about refactoring code or improving infrastructure without waiting for problems to manifest in production.

For instance, the feedback loop might expose slowdowns in application performance after each new feature is added. This would trigger a review to either refactor the feature code or improve system resources, preventing further technical debt accumulation.

Flow and Technical Debt:

While flow focuses on the smooth transition of work through the pipeline, it indirectly helps with technical debt by ensuring continuous and streamlined processes. However, feedback mechanisms are the primary tools for identifying and resolving technical debt.

Continuous Experimentation and Learning:

This principle promotes innovation and learning from failures but does not directly address technical debt. The focus here is more on risk-taking and improvement rather than managing or eliminating technical debt.

Reference from DevOps Practices:

The Phoenix Project, a book often referenced in DevOps, discusses how feedback loops are essential for maintaining system integrity and managing technical debt effectively. By improving feedback mechanisms, teams can address small issues before they become costly to fix.

The DevOps Handbook also highlights the importance of feedback in managing technical debt, emphasizing that fast feedback allows for continuous improvement and avoids the accumulation of bad practices that would otherwise lead to technical debt.

Juniper Automation and DevOps Context: Juniper's automation frameworks integrate feedback mechanisms using tools like continuous monitoring and automated testing. These tools help engineers track the health of network systems, identify configuration drifts, and resolve issues before they lead to significant technical debt.

Additional Resources:

The Phoenix Project by Gene Kim

The DevOps Handbook

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QUESTION: 10

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

Answer(s): B,D

Explanation:

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: 11

Which two statements are valid regarding Junos automation? (Choose two.)

The jsd process handles XML API calls.
The mgd process handles JET API requests.
The jsd process handles JET API requests.
The mod process handles XML API calls.

Answer(s): A,C

Explanation:

In Junos automation, several processes handle API requests, and understanding which process handles what is crucial:

jsd Process:

XML API Calls (A): The jsd process is responsible for handling XML API calls, which are a significant part of Junos automation. XML API allows for structured and standardized communication with Junos devices, enabling automation scripts to query and configure devices.

JET API Requests (C): The jsd process also handles JET (Junos Extension Toolkit) API requests. JET provides a more modern, programmable interface for interacting with Junos OS, and jsd is the process that manages these interactions.

mgd Process (Incorrect Option):

Not for JET API Requests: The mgd process handles general management operations, such as CLI commands and managing the configuration database, but it does not handle JET API requests. That role is fulfilled by jsd.

mod Process (Incorrect Option):

Not for XML API Calls: The mod process deals with managing chassis components and is not involved in handling XML API calls.

Reference:

Juniper Networks JET and XML API Documentation: Describes the roles of jsd in handling both XML and JET API requests.

Junos Automation and DevOps Documentation: Provides insights into how different processes interact with Junos APIs.

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QUESTION: 12

What is the difference between a list and a tuple in Python?

Lists are immutable objects that use square brackets, and tuples are mutable objects that use parentheses.
Lists are mutable objects that use square brackets, and tuples are immutable objects that use parentheses.
Lists are immutable objects that use parentheses, and tuples are immutable objects that use square brackets.
Lists are mutable objects that use parentheses, and tuples are immutable objects that use square brackets.

Answer(s): B

Explanation:

In Python, the distinction between lists and tuples is essential for efficient programming:

Lists:

Mutable (B): This means that once a list is created, its elements can be changed, added, or removed. Lists are versatile and commonly used when the data is expected to change.

Square Brackets: Lists are defined using square brackets [].

Example:

my_list = [1, 2, 3]

my_list[0] = 10 # Modifying the first element

Tuples:

Immutable (B): Once a tuple is created, it cannot be altered. Tuples are used when a fixed collection of items is needed, providing more integrity to the data.

Parentheses: Tuples are defined using parentheses ().

Example:

my_tuple = (1, 2, 3)

# my_tuple[0] = 10 # This would raise an error because tuples are immutable

Reference:

Python Official Documentation: The Python Language Reference provides detailed information on data types like lists and tuples, including their mutability and syntax.

Automation Scripts: In the context of automation, understanding when to use mutable or immutable data structures can significantly impact script performance and reliability.

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QUESTION: 13

You want to use a Python package or module.

In this scenario, which statement would accomplish this task?

reap
dir
input
Import

Answer(s): D

Explanation:

In Python, to use a package or module, you use the import statement. This statement allows you to load a module into your script so that you can use its functions, classes, and variables. For example, if you wanted to use the math module, you would write import math. This makes all the functions and constants in the math module available for use in your program.

Option A (reap), B (dir), and C (input) do not serve the purpose of importing modules. dir is used to list the attributes of an object, input is used to get user input, and reap is not a valid Python command related to importing modules.

Reference:

Python Documentation on Imports: The Python documentation provides clear guidelines on how to use the import statement to include modules in your Python scripts.

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QUESTION: 14

Using the set rest control configuration command, what are two ways to control access to the REST API running on a Junos device? (Choose two.)

Limit management access to only SSH
Limit management access to specific users.
Limit the number of simultaneous connections.
Limit access to only certain source IP addresses

Answer(s): C,D

Explanation:

When using the set rest control configuration command on a Junos device, you have several options to control access to the REST API. Two effective methods include:

Limiting the number of simultaneous connections: This ensures that the REST API is not overwhelmed by too many concurrent requests, which could potentially lead to performance issues or denial of service.

Limiting access to certain source IP addresses: This method restricts API access to specific IP addresses, enhancing security by ensuring that only trusted sources can interact with the REST API.

Option A (Limit management access to only SSH) is unrelated to controlling REST API access specifically.

Option B (Limit management access to specific users) might be relevant in a different context, but it is not directly tied to REST API control via the specific command mentioned.

Reference:

Juniper Networks REST API Documentation: This documentation explains how to configure and control access to the REST API on Junos devices, including connection limits and IP-based access control.

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QUESTION: 15

Which two statements about Junos automation are correct? (Choose two.)

The Junos REST API client is on-box.
Junos automation does not allow for device provisioning throuqh the console port.
Junos automation allows for device provisioning through the console port.
The Junos REST API client is off-box.

Answer(s): A,C

Explanation:

A. The Junos REST API client is on-box:
The Junos REST API is on-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.

Reference:

Junos Automation documentation explains that the REST API client runs natively on the device, providing a web-based interface for automation tasks.

C . Junos automation allows for device provisioning through the console port:
Junos automation does indeed allow for device provisioning through the console port, especially in the context of Zero Touch Provisioning (ZTP).
When network interfaces are not initially configured, or when remote access is not possible, devices can be provisioned via the console port. This method is commonly used during the initial setup process, enabling administrators to deploy configurations even without network access. ZTP automates initial configurations, including system setup and software installation, which can be triggered via the console.

Key Advantages of Console-based Provisioning:

Useful in environments where network interfaces are unavailable or not yet configured.

Essential for the initial bootstrapping of devices in remote locations.

Junos documentation on Zero Touch Provisioning (ZTP) and automation methods highlights that provisioning through the console port is supported and often used for initial setups.

Why the Other Options Are Incorrect:

B . Junos automation does not allow for device provisioning through the console port: This statement is incorrect because Junos automation does allow for provisioning via the console port, particularly during initial device setups.

D . The Junos REST API client is off-box: This is incorrect because the REST API client can be directly on the Junos device, providing local API functionality (on-box).

Juniper Automation in DevOps Context: Junos automation, especially with on-box REST API and console-based provisioning, enhances the flexibility and accessibility of device management in DevOps environments. These capabilities simplify remote configuration, monitoring, and device setup even in cases where direct network access is unavailable.

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QUESTION: 16

Which two statements are correct about using the Junos REST API? (Choose two.)

It supports data In CSV format.
It must use SSH for a connection.
NETCONF is not supported.
It is a simple configuration.

Answer(s): A,D

Explanation:

A. It supports data in CSV format:
The Junos REST API supports multiple data formats for transferring information between systems, including XML, JSON, and CSV (Comma Separated Values). This flexibility allows for easier data parsing, especially in environments where structured data (like CSV) is a standard. CSV is often used for bulk data export or import and reporting purposes, making it an essential format for automation tasks involving external systems or large datasets.

Example Usage in REST API:
When using the Junos REST API, a user can request configuration or operational data and specify the response format (XML, JSON, or CSV). CSV is particularly useful when integrating Junos devices with systems that require easily readable, tabular formats.

Reference:

Junos REST API documentation confirms support for CSV format alongside XML and JSON for RESTful interactions.
D . It is a simple configuration:
The Junos REST API is designed to be relatively simple to configure. Once the REST API service is enabled on the Junos device, it can be accessed via HTTP or HTTPS, making it an easy entry point for automation and management tasks. Unlike more complex protocols (such as NETCONF), the REST API is lightweight and easier to use for simple configuration changes and retrieving operational data.

Configuration Example:

To enable the REST API, you can add the following configuration:

set system services rest http set system services rest https

After enabling the service, API requests can be made to interact with the device for automation tasks, without needing the complexity of SSH or NETCONF configuration.

The Junos REST API is well-documented as an easy-to-configure and use API interface, making it accessible even for those who are new to Junos automation.

Why the Other Options Are Incorrect:

B . It must use SSH for a connection: This is incorrect. The Junos REST API uses HTTP or HTTPS for communication, not SSH. While SSH is commonly used for NETCONF, it is not required for REST API connections. REST APIs operate over standard web protocols.

C . NETCONF is not supported: This is incorrect. Junos supports both REST API and NETCONF for automation and configuration management. NETCONF is an XML-based protocol used for device configuration, which operates over SSH. The REST API and NETCONF can coexist on the same device, offering multiple avenues for automation.

Juniper Automation in DevOps Context: The simplicity and flexibility of the Junos REST API make it ideal for DevOps automation tasks. It allows teams to easily interact with Junos devices using lightweight RESTful methods, integrating with external systems through formats like CSV. The ease of configuration supports rapid deployment and scaling of automated management tasks.

Reference from Juniper Documentation:

Junos REST API Documentation

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Juniper JN0-224 Exam (page: 2) Juniper Automation and DevOps, Associate Updated on: 12-Feb-2026

QUESTION: 9

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QUESTION: 10

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QUESTION: 11

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QUESTION: 12

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QUESTION: 13

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QUESTION: 14

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QUESTION: 15

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QUESTION: 16

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Juniper JN0-224 Exam (page: 2)
Juniper Automation and DevOps, Associate
Updated on: 12-Feb-2026