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JN0-223 Practice Questions

Question # 1
Which two statements are correct about the Junos REST API Explorer? (Choose two.)
A. TheREST API Explorer is enabled bydefault on all Junos devices.
B. The REST API Explorer returns data only in XML format.
C. The REST API Explorer supports both GET and POST calls.
D. The REST API Explorer supports multiple RPC calls.


C. The REST API Explorer supports both GET and POST calls.
D. The REST API Explorer supports multiple RPC calls.

Explanation:

The Junos REST API Explorer provides an interactive environment to explore and execute REST API calls. The correct statements are:

Supports GET and POST Calls (C): The REST API Explorer allows users to make both GET and POST requests, enabling retrieval and submission of data to the Junos device.

Supports Multiple RPC Calls (D): The REST API Explorer can execute multiple RPC (Remote Procedure Call) commands, allowing a wide range of operations to be performed directly through the interface.

Option A is incorrectbecause the REST API Explorer is not enabled by default; it must be enabled manually.Option B is incorrectbecause the REST API Explorer returns data in both XML and JSON formats, not just XML.

Junos REST API Explorer Documentation: Provides details on the supported operations and how to use the Explorer for different types of requests.

Juniper Networks Documentation: Covers the setup and usage of the REST API Explorer.


Question # 2
What is the correct Python script syntax to prompt for input?
A. hostIP = input("Device IP address: ")
B. hostIP = input{Device IP address: }
C. hostIP = input"Device IP address: "
D. input("Device IP address: ") = hostIP


A. hostIP = input("Device IP address: ")

Explanation:

In Python, the correct syntax to prompt the user for input and store that input in a variable is:

input(prompt): Theinput()function is used to take input from the user. The string provided as an argument (inside the parentheses) is displayed as a prompt to the user. The input provided by the user is returned as a string and can be stored in a variable.

Example:

hostIP = input("Device IP address: ")

In this example,"Device IP address: "is the prompt displayed to the user, and the user's input will be stored in the variablehostIP.

Options B, C, and D are syntactically incorrect in Python.

Python Official Documentation: Describes the use of theinput()function for getting user input.

Python Tutorials: Various tutorials demonstrate how to properly use theinput()function in scripts.


Question # 3
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.


Question # 4
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.


B. The REST API application is stateless.
C. The TCP session state is maintained by the client

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.

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 # 5
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 # 6
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 # 7
You want to use a Python package or module. In this scenario, which statement would accomplish this task?
A. reap
B. dir
C. input
D. Import


D. Import

Explanation:

In Python, to use a package or module, you use theimportstatement. 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 themathmodule, you would writeimport math. This makes all the functions and constants in themathmodule available for use in your program.

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

Supporting References:

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

Question # 8
You are using the curl tool to include multiple RPCs in a REST API request. Which HTTP method must be used for this request?
A. GET
B. PUT
C. POST
D. HEAD


C. POST


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