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JN0-223 Practice Questions

Question # 1
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 statement is correct?
A. The request is handled by the mod process runningon the Junos device.
B. The request is handled by the isrpd process runningon the Junos device.
C. The request is handled by the rpd process runningon the Junos device.
D. The request is handled by the isd process runningon the Junos device


B. The request is handled by the isrpd process runningon the Junos device.

Explanation:

When using the REST API on a Junos device, theisrpd(Integrated Service Routing Process Daemon) process is responsible for handling REST API requests. This process listens for incoming HTTP requests and processes them accordingly, including retrieving interface configuration information when a GET request is made.

Option Bis correct because theisrpdprocess handles the REST API requests on a Junos device.

Options A (mod process), C (rpd process), and D (isd process)are incorrect in this context as they either do not exist or serve different purposes on a Junos device.

Supporting References:

Juniper Networks REST API Documentation:Provides insights into how REST API requests are managed and processed by theisrpdprocess on Junos devices.


Question # 2
What is the difference between a list and a tuple in Python?
A. Lists are immutable objects thatuse square brackets, and tuplesare mutable objects that use parentheses.
B. Lists are mutable objects that use square brackets, and tuples are immutable objects that use parentheses.
C. Lists are immutable objects that use parentheses, and tuples are immutable objects that use square brackets.
D. Lists are mutable objects that use parentheses, and tuples are immutable objects that use square brackets.


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

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

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.


Question # 3
Which two programing languages would be used for on-box scripting with Junos devices? (Choose two.)

A. Python
B. Puppet
C. Ansible
D. XSLT


A. Python
D. XSLT


Question # 4
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.


D. YAML and JSON are case-sensitive.

Explanation:

Both YAML and JSON are case-sensitive, meaning that the distinction between uppercase and lowercase characters matters. For example, in JSON or YAML,Keyandkeywould be considered different.

Option D (case-sensitive)is correct because both YAML and JSON treat keys and values with different cases as distinct.

Option Ais incorrect because, while JSON does not use indentation, YAML does rely on indentation to define structure.Option Bis incorrect because whitespace can be significant in YAML for structure, andOption Cis incorrect because JSON does not support comments, while YAML does.

Supporting References:

YAML and JSON Documentation:The official specifications for both YAML and JSON emphasize their case sensitivity.


Question # 5
Which two statements about NETCONF are correct? (Choose two.)
A. The default port for NETCONF is port 930.
B. The default port for NETCONF is port 830.
C. NETCONF cannot use the default SSH port.
D. NETCONF can use the default SSH port.


B. The default port for NETCONF is port 830.
D. NETCONF can use the default SSH port.

Explanation:

NETCONF (Network Configuration Protocol) is used for network device management and can operate over SSH. The following are true about NETCONF:

Default Port 830 (B): By default, NETCONF uses port 830 for communication over SSH. This is the standard port reserved for NETCONF sessions.

Use of Default SSH Port (D): NETCONF can also operate over the standard SSH port (port 22) if configured to do so. This allows flexibility in network management scenarios where port 830 might not be available or used.

Options A and C are incorrectbecause they refer to incorrect or non-applicable port numbers for NETCONF.

IETF RFC 6241: Specifies the use of NETCONF over SSH, including port details.

Juniper Networks NETCONF Documentation: Discusses the configuration and operation of NETCONF on Junos devices, including port usage.


Question # 6
Which Junos API supports direct modification of the Ephemeral database?
A. JET
B. WebSocket
C. SOAP
D. REST


A. JET

Explanation:

In Junos, theJET (Junos Extension Toolkit)API supports direct modification of theEphemeral database. The Ephemeral database is a temporary configuration database used in Junos OS, allowing for changes that do not persist after a reboot unless explicitly committed to the permanent configuration.

JET API: Allows for high-performance interactions with Junos, including the ability to make changes to the Ephemeral database, which is useful for temporary configurations, dynamic policies, and other operational tasks.

Other options like WebSocket, SOAP, and REST do not provide direct access to the Ephemeral database in Junos.

Juniper Networks JET Documentation: Details how JET API interacts with the Ephemeral database.

Junos Automation and DevOps Documentation: Discusses the use of JET for automation and dynamic configuration.


Question # 7
Which two statements about Ansible are correct? (Choose two.)
A. Ansible can use a single playbook to configure devices from multiple vendors.
B. Ansible modules must be written in Go.
C. Ansible is an open source project.
D. Ansible requires a license to unlock full functionality.


A. Ansible can use a single playbook to configure devices from multiple vendors.
C. Ansible is an open source project.


Question # 8
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.)
A. Limit management access to only SSH
B. Limit management access to specific users
C. Limit the number of simultaneous connections.
D. Limit access to only certain source IP addresses


C. Limit the number of simultaneous connections.
D. Limit access to only certain source IP addresses

Explanation:

When using theset rest control configurationcommand 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.

Supporting References:

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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