Juniper JN0-224 Practice Exams
Last updated on Oct 22,2026- Exam Code: JN0-224
- Exam Name: Automation and DevOps, Associate (JNCIA-DevOps)
- Certification Provider: Juniper
- Latest update: Oct 22,2026
Question #51
Which two standard logical operators does XPath support? (Choose two.)
- A . IOR
- B . NOT
- C . AND
- D . MAMD
Correct Answer: B, C
B, C
Explanation:
XPath is a query language used for selecting nodes from an XML document. It supports various logical operators that can be used to create complex queries.
The two standard logical operators supported by XPath are:
NOT: This operator negates a condition, returning true if the condition is false, and vice versa.
AND: This operator is used to combine two conditions, and it returns true only if both conditions are true.
Option A (IOR) and Option D (MAMD) are not standard XPath operators.
Supporting
Reference: XPath Documentation: The W3C XPath specification lists the standard operators supported in XPath, including AND and NOT.
B, C
Explanation:
XPath is a query language used for selecting nodes from an XML document. It supports various logical operators that can be used to create complex queries.
The two standard logical operators supported by XPath are:
NOT: This operator negates a condition, returning true if the condition is false, and vice versa.
AND: This operator is used to combine two conditions, and it returns true only if both conditions are true.
Option A (IOR) and Option D (MAMD) are not standard XPath operators.
Supporting
Reference: XPath Documentation: The W3C XPath specification lists the standard operators supported in XPath, including AND and NOT.
Question #52
Which statement is valid regarding YAML and JSON?
- A . YAML and JSON use indentation.
- B . White space is ignored in YAML and JSON.
- C . Comments are available in YAML and JSON.
- D . YAML and JSON are case-sensitive.
Correct Answer: D
D
Explanation:
Both YAML and JSON are case-sensitive, meaning that the distinction between uppercase and lowercase characters matters. For example, in JSON or YAML, Key and key would be considered different.
Option D (case-sensitive) is correct because both YAML and JSON treat keys and values with different cases as distinct.
Option A is incorrect because, while JSON does not use indentation, YAML does rely on indentation to define structure. Option B is incorrect because whitespace can be significant in YAML for structure, and Option C is incorrect because JSON does not support comments, while YAML does.
Supporting
Reference: YAML and JSON Documentation: The official specifications for both YAML and JSON emphasize their case sensitivity.
D
Explanation:
Both YAML and JSON are case-sensitive, meaning that the distinction between uppercase and lowercase characters matters. For example, in JSON or YAML, Key and key would be considered different.
Option D (case-sensitive) is correct because both YAML and JSON treat keys and values with different cases as distinct.
Option A is incorrect because, while JSON does not use indentation, YAML does rely on indentation to define structure. Option B is incorrect because whitespace can be significant in YAML for structure, and Option C is incorrect because JSON does not support comments, while YAML does.
Supporting
Reference: YAML and JSON Documentation: The official specifications for both YAML and JSON emphasize their case sensitivity.
Question #53
Which two statements about XML schema definition (XSD) files are correct? (Choose two.)
- A . XSD files define all the elements in an XML document and the document XML hierarchy.
- B . Every XML document must have an XSD file defined for it.
- C . An XSD file is not an XML document.
- D . XSD files ensure that everyone working with the XML document uses a common set of tags.
Correct Answer: A, D
A, D
Explanation:
XML Schema Definition (XSD) files are used to define the structure and data types of an XML document. They ensure that the XML document adheres to a specific structure by defining the allowed elements, attributes, and their data types, thereby enforcing a consistent format.
Option A is correct because XSD files define the elements, attributes, and structure (hierarchy) of an XML document.
Option D is correct because XSD files provide a standardized format, ensuring that all parties working with the XML document use the same set of tags and structure.
Option B (Every XML document must have an XSD file defined for it) is incorrect; not every XML document requires an XSD file, although it’s beneficial for validation.
Option C (An XSD file is not an XML document) is incorrect because XSD files themselves are written in XML.
Supporting
Reference: W3C XML Schema Definition (XSD) Documentation: Explains the purpose and structure of XSD files, including their role in defining XML document schemas.
A, D
Explanation:
XML Schema Definition (XSD) files are used to define the structure and data types of an XML document. They ensure that the XML document adheres to a specific structure by defining the allowed elements, attributes, and their data types, thereby enforcing a consistent format.
Option A is correct because XSD files define the elements, attributes, and structure (hierarchy) of an XML document.
Option D is correct because XSD files provide a standardized format, ensuring that all parties working with the XML document use the same set of tags and structure.
Option B (Every XML document must have an XSD file defined for it) is incorrect; not every XML document requires an XSD file, although it’s beneficial for validation.
Option C (An XSD file is not an XML document) is incorrect because XSD files themselves are written in XML.
Supporting
Reference: W3C XML Schema Definition (XSD) Documentation: Explains the purpose and structure of XSD files, including their role in defining XML document schemas.
Question #54
You must use Junos PyEZ to configure unique IP addresses on individual machines.
Which two features will permit this requirement? (Choose). Ian SCP module
- A . an SCP module
- B . a BSON data file
- C . a YAML data file
- D . a Jinja2 template
Correct Answer: C, D
C, D
Explanation:
To configure unique IP addresses on individual machines using Junos PyEZ, you can use the following features:
YAML Data File (C): YAML files are used to store configuration data in a human-readable format. They are often used in combination with Jinja2 templates to provide the data necessary for template rendering.
Jinja2 Template (D): Jinja2 is a templating engine for Python that allows you to create dynamic templates. When used with Junos PyEZ, a Jinja2 template can be filled with data (such as IP addresses from a YAML file) to generate configuration snippets that are applied to different devices.
Options A (SCP module) and B (BSON data file) are not typically used with Junos PyEZ for this
purpose.
Reference: Junos PyEZ Documentation: Discusses the use of YAML files and Jinja2 templates for generating configurations.
Jinja2 Templating Documentation: Provides details on how to create and use templates in Python scripts.
C, D
Explanation:
To configure unique IP addresses on individual machines using Junos PyEZ, you can use the following features:
YAML Data File (C): YAML files are used to store configuration data in a human-readable format. They are often used in combination with Jinja2 templates to provide the data necessary for template rendering.
Jinja2 Template (D): Jinja2 is a templating engine for Python that allows you to create dynamic templates. When used with Junos PyEZ, a Jinja2 template can be filled with data (such as IP addresses from a YAML file) to generate configuration snippets that are applied to different devices.
Options A (SCP module) and B (BSON data file) are not typically used with Junos PyEZ for this
purpose.
Reference: Junos PyEZ Documentation: Discusses the use of YAML files and Jinja2 templates for generating configurations.
Jinja2 Templating Documentation: Provides details on how to create and use templates in Python scripts.
Question #55
Which two programming languages are used for Junos on-box scripting? (Choose two.)
- A . Perl
- B . Ruby
- C . SLAX
- D . XSLT
Correct Answer: C, D
C, D
Explanation:
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.
Reference: 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.
C, D
Explanation:
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.
Reference: 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.
Question #56
Junos supports which two APIs for on-box scripting? (Choose two.)
- A . JET
- B . Puppet
- C . XML
- D . Chef
Correct Answer: A, C
A, C
Explanation:
Juniper Networks’ Junos operating system supports several APIs for on-box scripting, two of which are:
JET (Juniper Extension Toolkit): JET is a modern API framework that provides a programmable interface for interacting with Junos. It allows developers to create custom applications that run directly on Junos devices, enabling the automation of network operations. JET provides both a gRPC and a REST API interface, allowing for flexible integration with external systems.
XML API: The Junos XML API allows direct interaction with the Junos OS through XML-based requests. This API can be used to retrieve information, configure devices, and execute commands on Junos devices. The XML API is crucial for automation tasks as it provides a structured and consistent way to interact with the device’s configuration and operational data.
Detailed Explanation
JET (A) provides high-performance access to Junos routing, switching, and service elements via programmable interfaces. It is highly used for creating custom applications that require tight integration with the Junos OS.
XML (C), on the other hand, is a well-established method for interacting with Junos, especially for legacy systems or when working within environments where XML is the standard data format.
Other options like Puppet (B) and Chef (D) are not APIs provided by Junos for on-box scripting but are configuration management tools used externally to manage Junos devices.
Reference: Juniper Networks JET Documentation: Provides details on how to leverage JET APIs for automation.
Junos XML Management Protocol Guide: Describes how to use XML for scripting and automating tasks in Junos.
These APIs are key components of Juniper’s automation strategy, allowing for scalable, flexible, and efficient network operations.
A, C
Explanation:
Juniper Networks’ Junos operating system supports several APIs for on-box scripting, two of which are:
JET (Juniper Extension Toolkit): JET is a modern API framework that provides a programmable interface for interacting with Junos. It allows developers to create custom applications that run directly on Junos devices, enabling the automation of network operations. JET provides both a gRPC and a REST API interface, allowing for flexible integration with external systems.
XML API: The Junos XML API allows direct interaction with the Junos OS through XML-based requests. This API can be used to retrieve information, configure devices, and execute commands on Junos devices. The XML API is crucial for automation tasks as it provides a structured and consistent way to interact with the device’s configuration and operational data.
Detailed Explanation
JET (A) provides high-performance access to Junos routing, switching, and service elements via programmable interfaces. It is highly used for creating custom applications that require tight integration with the Junos OS.
XML (C), on the other hand, is a well-established method for interacting with Junos, especially for legacy systems or when working within environments where XML is the standard data format.
Other options like Puppet (B) and Chef (D) are not APIs provided by Junos for on-box scripting but are configuration management tools used externally to manage Junos devices.
Reference: Juniper Networks JET Documentation: Provides details on how to leverage JET APIs for automation.
Junos XML Management Protocol Guide: Describes how to use XML for scripting and automating tasks in Junos.
These APIs are key components of Juniper’s automation strategy, allowing for scalable, flexible, and efficient network operations.
Question #57
Which two statements about the REST API are correct? (Choose two.)
- A . The TCP session state is maintained by the server.
- B . The REST API application is stateless.
- C . The TCP session state is maintained by the client
- D . The REST API application is stateful.
Correct Answer: B, C
B, C
Explanation:
REST (Representational State Transfer) is an architectural style for designing networked applications, and its key principles include:
Statelessness (B): Each request from the client to the server must contain all the information needed to understand and process the request. The server does not store any session state between requests, meaning each request is independent and does not rely on previous ones.
TCP Session State (C): While REST itself is stateless, the underlying TCP connection’s state, such as keeping the connection alive or managing retries, is handled by the client. The server does not retain information about the TCP connection beyond the processing of the individual request.
Options A and D are incorrect because they imply that the REST API is stateful, which contradicts the stateless nature of REST.
Reference: REST API Design Principles: Describes the stateless nature of REST and the responsibility of clients in managing session state.
Web Development Documentation: Discusses how REST APIs operate, focusing on statelessness and client-server interaction.
B, C
Explanation:
REST (Representational State Transfer) is an architectural style for designing networked applications, and its key principles include:
Statelessness (B): Each request from the client to the server must contain all the information needed to understand and process the request. The server does not store any session state between requests, meaning each request is independent and does not rely on previous ones.
TCP Session State (C): While REST itself is stateless, the underlying TCP connection’s state, such as keeping the connection alive or managing retries, is handled by the client. The server does not retain information about the TCP connection beyond the processing of the individual request.
Options A and D are incorrect because they imply that the REST API is stateful, which contradicts the stateless nature of REST.
Reference: REST API Design Principles: Describes the stateless nature of REST and the responsibility of clients in managing session state.
Web Development Documentation: Discusses how REST APIs operate, focusing on statelessness and client-server interaction.
Question #58
Which two statements are correct about using the Junos REST API? (Choose two.)
- A . It supports data In CSV format.
- B . It must use SSH for a connection.
- C . NETCONF is not supported.
- D . It is a simple configuration.
Correct Answer: A, D
A, D
Explanation:
A, D
Explanation:
Question #59
Which process is responsible for XML automation requests?
- A . jsrpd
- B . mgd
- C . rpd
- D . jsd
Correct Answer: B
B
Explanation:
The mgd (Management Daemon) process in Junos is responsible for handling XML automation requests. This daemon manages the configuration and operational commands received via NETCONF, which uses XML for data exchange. The mgd process parses the XML data and applies the necessary configuration or retrieves the requested information.
Option B is correct because mgd is the process that handles XML-based requests in Junos.
Options A (jsrpd), C (rpd), and D (jsd) are incorrect because they are responsible for different functions, such as routing protocols and services, not XML automation.
Supporting
Reference: Juniper Networks Management Daemon (mgd) Documentation: Provides an overview of the responsibilities of the mgd process, including handling XML requests.
B
Explanation:
The mgd (Management Daemon) process in Junos is responsible for handling XML automation requests. This daemon manages the configuration and operational commands received via NETCONF, which uses XML for data exchange. The mgd process parses the XML data and applies the necessary configuration or retrieves the requested information.
Option B is correct because mgd is the process that handles XML-based requests in Junos.
Options A (jsrpd), C (rpd), and D (jsd) are incorrect because they are responsible for different functions, such as routing protocols and services, not XML automation.
Supporting
Reference: Juniper Networks Management Daemon (mgd) Documentation: Provides an overview of the responsibilities of the mgd process, including handling XML requests.
Question #60
What is the default port for NETCONF connections over SSH?
- A . 22
- B . 8080
- C . 830
- D . 433
Correct Answer: C
C
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/netconf/topics/topic-map/netconf-ssh-connection.html
The IANA-assigned port for NETCONF-over-SSH sessions is 830.
C
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/netconf/topics/topic-map/netconf-ssh-connection.html
The IANA-assigned port for NETCONF-over-SSH sessions is 830.