매달, 우리는 1000명 이상의 사람들이 시험 준비를 잘하고 시험을 잘 통과할 수 있도록 도와줍니다.
Automation and DevOps, Associate (JNCIA-DevOps) 온라인 연습
최종 업데이트 시간: 2025년04월20일
당신은 온라인 연습 문제를 통해 Juniper JN0-224 시험지식에 대해 자신이 어떻게 알고 있는지 파악한 후 시험 참가 신청 여부를 결정할 수 있다.
시험을 100% 합격하고 시험 준비 시간을 35% 절약하기를 바라며 JN0-224 덤프 (최신 실제 시험 문제)를 사용 선택하여 현재 최신 66개의 시험 문제와 답을 포함하십시오.
정답:
Explanation:
The jsd (Junos Script Daemon) process is responsible for handling JET (Junos Extension Toolkit) automation requests. The JET framework allows for more programmable interactions with Junos devices, using APIs to manage and automate network functions. The jsd process handles these API requests, executes the relevant scripts, and interacts with the Junos configuration and operational states accordingly.
JET enables developers to write applications that interact with the Junos OS through APIs, providing a powerful tool for network automation, monitoring, and configuration management. The jsd process ensures that all JET-related operations are processed and executed properly.
Why the Other Options Are Incorrect:
A. jsrpd: This is not a process associated with JET automation requests.
B. mgd: The mgd process is responsible for handling management tasks like CLI commands and configuration changes but is not directly responsible for JET automation requests.
C. rpd: The rpd (Routing Protocol Daemon) manages routing protocols like BGP and OSPF but has no involvement in JET automation.
Reference from Juniper Documentation:
Juniper's documentation on JET and the jsd process outlines how this daemon manages script and API request processing for automation tasks.
정답:
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.
정답:
Explanation:
When using the REST API on a Junos device, the isrpd (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 B is correct because the isrpd process 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
Reference: Juniper Networks REST API Documentation: Provides insights into how REST API requests are managed and processed by the isrpd process on Junos devices.
정답:
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.
정답:
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.
정답:
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.
정답:
Explanation:
In Junos, the JET (Junos Extension Toolkit) API supports direct modification of the Ephemeral 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.
Reference: 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.
정답:
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.
정답:
Explanation:
In Python, the correct syntax to prompt the user for input and store that input in a variable is:
input(prompt): The input() 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 variable hostIP.
Options B, C, and D are syntactically incorrect in Python.
Reference: Python Official Documentation: Describes the use of the input() function for getting user input.
Python Tutorials: Various tutorials demonstrate how to properly use the input() function in scripts.
정답:
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.
Reference: 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
정답:
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.
Reference: 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.
정답:
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.
Supporting
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.
정답:
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.
Supporting
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.
정답:
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.
정답:
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.