Juniper JN0-224 Practice Exams
Last updated on Oct 21,2026- Exam Code: JN0-224
- Exam Name: Automation and DevOps, Associate (JNCIA-DevOps)
- Certification Provider: Juniper
- Latest update: Oct 21,2026
Question #21
Which two statements about Junos automation are correct? (Choose two.)
- A . The Junos REST API client is on-box.
- B . Junos automation does not allow for device provisioning throuqh the console port.
- C . Junos automation allows for device provisioning through the console port.
- D . The Junos REST API client is off-box.
Correct Answer: AC
AC
Explanation:
AC
Explanation:
Question #22
Which statement is correct about Ansible playbooks?
- A . A playbook is a configuration file that defines the Ansible related parameters
- B . A playbook contains one or more tasks written in XML
- C . A playbook can contain multiple tasks and execute multiple Python modules
- D . A playbook is a specific Python module that is executed on a host
Correct Answer: C
Question #23
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
B
Explanation:
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.
B
Explanation:
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.
Question #24
You are asked to use the REST API to retrieve interface configuration information from your Junos device. You decide to use a cURL HTTP GET command to retrieve this information.
In this scenario, which two statements are correct? (Choose two.)
- A . You can retrieve this data in HTML or JSON formats.
- B . You must have SSH enabled on the Junos device.
- C . You can retrieve this data in XML or JSON formats.
- D . You must Include the authentication Information with each request.
Correct Answer: C, D
C, D
Explanation:
When using the REST API to retrieve interface configuration information from a Junos device:
Data Formats (C): The information can be retrieved in XML or JSON formats. These are the two standard data formats supported by the Junos REST API for representing configuration and operational data.
Authentication (D): For each HTTP request, especially when using tools like cURL, authentication information must be included. This is typically done using basic authentication (username and password) or an authentication token.
Option A is incorrect because HTML is not a supported format for REST API data retrieval in Junos, and Option B is incorrect because SSH is not required for REST API requests; the REST API typically uses HTTP/HTTPS.
Reference: Junos REST API Documentation: Details the data formats (XML, JSON) supported by the Junos REST
API and the need for authentication.
cURL Usage with REST API: Provides examples of how to use cURL with Junos REST API, including the necessity of providing authentication.
C, D
Explanation:
When using the REST API to retrieve interface configuration information from a Junos device:
Data Formats (C): The information can be retrieved in XML or JSON formats. These are the two standard data formats supported by the Junos REST API for representing configuration and operational data.
Authentication (D): For each HTTP request, especially when using tools like cURL, authentication information must be included. This is typically done using basic authentication (username and password) or an authentication token.
Option A is incorrect because HTML is not a supported format for REST API data retrieval in Junos, and Option B is incorrect because SSH is not required for REST API requests; the REST API typically uses HTTP/HTTPS.
Reference: Junos REST API Documentation: Details the data formats (XML, JSON) supported by the Junos REST
API and the need for authentication.
cURL Usage with REST API: Provides examples of how to use cURL with Junos REST API, including the necessity of providing authentication.
Question #25
Which data construct is used to guarantee that element names and data values remain unique in an XML document?
- A . element
- B . schema definition
- C . namespace
- D . dictionary
Correct Answer: C
C
Explanation:
In XML documents, a namespace is the data construct used to ensure that element names and data values remain unique. Namespaces prevent naming conflicts by differentiating between elements or attributes that may have the same name but different meanings. This is particularly important in XML, where documents often incorporate elements from multiple sources.
Detailed Explanation
XML Namespaces: A namespace is a collection of names, identified by a URI reference, which is used to distinguish between elements that may have identical names but different definitions or origins. This helps avoid ambiguity in the document.
How Namespaces Work: When a namespace is applied, each element or attribute in the XML document is associated with a prefix. This prefix, combined with the namespace URI, ensures that the element or attribute is uniquely identified, even if another element or attribute in the same document has the same local name but a different namespace.
Schema Definition vs. Namespace: Although an XML schema definition (XSD) can define the structure and type constraints of an XML document, it does not guarantee uniqueness of element names across different XML documents. That role is fulfilled by namespaces.
Practical Example:
xml
Copy code
<root xmlns:ns1="http://www.example.com/ns1"
xmlns:ns2="http://www.example.com/ns2">
<ns1:item>Item in namespace 1</ns1:item>
<ns2:item>Item in namespace 2</ns2:item>
</root>
In this example, the item elements are in different namespaces (ns1 and ns2), which keeps them unique even though they have the same name.
Reference: Juniper Automation and DevOps Documentation: These practices highlight the importance of namespaces in XML documents to maintain the integrity and uniqueness of data, which is essential in automation scripts and configuration files.
W3C XML Namespace Specification: The World Wide Web Consortium (W3C) standard for XML Namespaces defines how namespaces should be used to avoid name conflicts.
Namespaces are a crucial concept in XML, ensuring that data can be consistently managed and
interpreted correctly, particularly in complex systems where multiple XML documents or schemas are involved.
C
Explanation:
In XML documents, a namespace is the data construct used to ensure that element names and data values remain unique. Namespaces prevent naming conflicts by differentiating between elements or attributes that may have the same name but different meanings. This is particularly important in XML, where documents often incorporate elements from multiple sources.
Detailed Explanation
XML Namespaces: A namespace is a collection of names, identified by a URI reference, which is used to distinguish between elements that may have identical names but different definitions or origins. This helps avoid ambiguity in the document.
How Namespaces Work: When a namespace is applied, each element or attribute in the XML document is associated with a prefix. This prefix, combined with the namespace URI, ensures that the element or attribute is uniquely identified, even if another element or attribute in the same document has the same local name but a different namespace.
Schema Definition vs. Namespace: Although an XML schema definition (XSD) can define the structure and type constraints of an XML document, it does not guarantee uniqueness of element names across different XML documents. That role is fulfilled by namespaces.
Practical Example:
xml
Copy code
<root xmlns:ns1="http://www.example.com/ns1"
xmlns:ns2="http://www.example.com/ns2">
<ns1:item>Item in namespace 1</ns1:item>
<ns2:item>Item in namespace 2</ns2:item>
</root>
In this example, the item elements are in different namespaces (ns1 and ns2), which keeps them unique even though they have the same name.
Reference: Juniper Automation and DevOps Documentation: These practices highlight the importance of namespaces in XML documents to maintain the integrity and uniqueness of data, which is essential in automation scripts and configuration files.
W3C XML Namespace Specification: The World Wide Web Consortium (W3C) standard for XML Namespaces defines how namespaces should be used to avoid name conflicts.
Namespaces are a crucial concept in XML, ensuring that data can be consistently managed and
interpreted correctly, particularly in complex systems where multiple XML documents or schemas are involved.
Question #26
Which development model is the classic approach to software development?
- A . Waterfall
- B . Scrum
- C . Kanban
- D . Lean
Correct Answer: A
Question #27
Which two programming languages have a NETCONF library supported by Juniper Networks? (Choose two.)
- A . Ruby
- B . Python
- C . Go
- D . SLAX
Correct Answer: B, C
B, C
Explanation:
Juniper Networks supports NETCONF libraries for several programming languages, including:
Python (B): Python has a well-supported NETCONF library called ncclient, which is widely used for automating network configurations across Junos devices.
Go (C): Go also has a NETCONF library (go-netconf), which provides similar functionalities for managing Junos devices.
Ruby (A) and SLAX (D) do not have widely recognized or supported NETCONF libraries directly from Juniper Networks, making Python and Go the correct choices.
Reference: Juniper Networks NETCONF Documentation: Lists supported programming languages and libraries for interacting with NETCONF on Junos devices.
ncclient Documentation: The primary Python library for working with NETCONF.
B, C
Explanation:
Juniper Networks supports NETCONF libraries for several programming languages, including:
Python (B): Python has a well-supported NETCONF library called ncclient, which is widely used for automating network configurations across Junos devices.
Go (C): Go also has a NETCONF library (go-netconf), which provides similar functionalities for managing Junos devices.
Ruby (A) and SLAX (D) do not have widely recognized or supported NETCONF libraries directly from Juniper Networks, making Python and Go the correct choices.
Reference: Juniper Networks NETCONF Documentation: Lists supported programming languages and libraries for interacting with NETCONF on Junos devices.
ncclient Documentation: The primary Python library for working with NETCONF.
Question #28
Given the following Python script:
a = [1,2,3,4,5,6,7,8,9]
print(a[0])
What is the output of this print command?
- A . 1
- B . 2
- C . 7
- D . 9
Correct Answer: A
A
Explanation:
In Python, lists are zero-indexed, meaning the first element of the list is at index 0. The given script is:
pythona = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(a[0])
a[0] refers to the first element in the list a, which is 1.
So, the output of the print(a[0]) command is 1.
Option A is correct because Python indexing starts at 0, making the first element of the list at index 0.
Reference: Python Official Documentation: Covers list indexing and operations.
Python Programming Tutorials: Provide examples of list indexing.
A
Explanation:
In Python, lists are zero-indexed, meaning the first element of the list is at index 0. The given script is:
pythona = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(a[0])
a[0] refers to the first element in the list a, which is 1.
So, the output of the print(a[0]) command is 1.
Option A is correct because Python indexing starts at 0, making the first element of the list at index 0.
Reference: Python Official Documentation: Covers list indexing and operations.
Python Programming Tutorials: Provide examples of list indexing.
Question #29
You want to make a list in Python to store data.
Which statement is the correct way to accomplish this task?
- A . L="0,1,2,3,4,5"
- B . L={0,1,2,3,4,5}
- C . L=[0,1,2,3,4,5]
- D . L=(0,1,2,3,4,5)
Correct Answer: C
C
Explanation:
In Python, to create a list, you use square brackets [].
The correct syntax to create a list containing the numbers 0 through 5 is:
L= [0,1,2,3,4,5]
This statement creates a list object that stores the specified integers.
Other options are incorrect:
A defines a string, not a list.
B defines a set, which is an unordered collection with no duplicate elements.
D defines a tuple, which is an immutable sequence, not a list.
Reference: Python Official Documentation: Discusses lists, sets, tuples, and their syntaxes.
Python Data Structures Guide: Provides examples of creating and manipulating lists.
C
Explanation:
In Python, to create a list, you use square brackets [].
The correct syntax to create a list containing the numbers 0 through 5 is:
L= [0,1,2,3,4,5]
This statement creates a list object that stores the specified integers.
Other options are incorrect:
A defines a string, not a list.
B defines a set, which is an unordered collection with no duplicate elements.
D defines a tuple, which is an immutable sequence, not a list.
Reference: Python Official Documentation: Discusses lists, sets, tuples, and their syntaxes.
Python Data Structures Guide: Provides examples of creating and manipulating lists.
Question #30
What is an example of correct XML syntax?
- A . <Device3><ho3tname>vMX1</hostname><Devices/>
- B . <Devices><hostname>vMX1<De vices/X/hostname>
- C . <Devices><hostname>vMX1<Devices/>
- D . <Devices><hostname>vMX1</ho3tnameX/Device3>
Correct Answer: B