JN0-223 Exam Dumps - Juniper Automation and DevOps Questions and Answers

In Junos OS, acommit scriptis an on-box automation script that runs every time a configuration change is committed. Commit scripts are used to enforce configuration policies, validate configuration changes, or make automatic adjustments to configurations when certain conditions are met.

Commit Script (C): Executes automatically during the commit process, ensuring that the new configuration adheres to specific rules or conventions before it is applied to the system.

Event, SNMP, and operation scriptsare used for other purposes in Junos automation but do not run automatically with every configuration change.

Junos OS Automation Scripts Guide: Provides details on different types of scripts, including commit scripts, and their use cases.

Juniper Networks Documentation: Offers examples and best practices for creating and using commit scripts.

References:

NETCONF (Network Configuration Protocol) is a standard protocol defined for managing network devices. NETCONF operates in a layered architecture, which includes the following key layers:

Operations Layer: This layer deals with the actual operations like , , , and others. It receives RPC (Remote Procedure Call) requests from a remote NETCONF client and processes these requests.

Messages Layer: This layer is responsible for encoding the RPCs and sending them over the network. It handles the communication between the NETCONF client and server, ensuring that the RPC messages are correctly formatted (usually in XML) and transmitted.

Statement Bis correct because the Messages layer is responsible for sending RPCs to a remote NETCONF server.

Statement Cis correct because the Operations layer is where the NETCONF server receives and processes the RPCs sent by the client.

Supporting References:

Juniper Networks NETCONF Documentation:Provides a detailed breakdown of the NETCONF protocol layers and their functions.

RFC 6241:The official specification for NETCONF, which describes the layered architecture, including the operations and messages layers.

An XML schema document (XSD) is a key component in defining the structure and constraints of XML data used in various applications, including Junos:

Authoritative Source (C): An XML schema document serves as the authoritative definition of the structure, content, and semantics of XML documents. It ensures that the XML data adheres to specific rules and formats, which is essential for both operational and configuration XML.

XSD Format (D): XML schema documents are typically written in the XSD (XML Schema Definition) format, which provides a formal description of the XML document's structure.

Option A is incorrectbecause XML schemas are not formatted as XLT files (which are related to XSLT transformations), andOption B is incorrectbecause XML schemas can indeed be examined in the Junos CLI using appropriate commands.

W3C XML Schema Definition Language (XSD) Documentation: Provides comprehensive information on the XSD format.

Juniper Networks Documentation: Discusses the role of XML schemas in managing Junos configurations.

References:

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:

Adefines a string, not a list.

Bdefines a set, which is an unordered collection with no duplicate elements.

Ddefines a tuple, which is an immutable sequence, not a list.

Python Official Documentation: Discusses lists, sets, tuples, and their syntaxes.

Python Data Structures Guide: Provides examples of creating and manipulating lists.

References:

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.

In JSON (JavaScript Object Notation), the two primary data structures are:

Objects:These are collections of key-value pairs, where each key is a string, and the value can be a string, number, array, boolean, or another object. In Python, this structure is analogous to a dictionary.

Arrays:These are ordered lists of values, where each value can be of any data type, including another array or object. In Python, this structure is similar to a list.

Option A (tuples)andOption D (dictionaries)refer to Python-specific data structures and are not directly used in JSON.

Supporting References:

JSON Documentation and Tutorials:JSON objects and arrays are the standard data structures used in this format, as described in many tutorials and the official JSON documentation.

 A. It supports data in CSV format:The Junos REST API supports multiple data formats for transferring information between systems, including XML, JSON, andCSV (Comma Separated Values). This flexibility allows for easier data parsing, especially in environments where structured data (likeCSV) 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.

REST APIs use HTTP methods to perform different operations on resources. In the context of RPC (Remote Procedure Call) requests:

GET:This method is used to retrieve data from the server. In a REST API, it is commonly used to fetch information about resources, such as the current configuration or operational state.

POST:This method is used to send data to the server to create or update a resource. In the context of RPC, POST is often used to execute a procedure on the server that may result in the modification of a resource or triggering of an action.

Options B (HEAD) and D (CONNECT) are not typically used for executing RPC requests:

HEADis similar to GET but only retrieves the headers, not the body of the response.

CONNECTis used to establish a tunnel to the server, primarily for SSL-encrypted communication, and is not commonly associated with RESTful RPC operations.

Supporting References:

Juniper Networks REST API Documentation:The documentation provides detailed information about the use of HTTP methods in Juniper's RESTful services.

"RESTful Web Services"by Leonard Richardson and Sam Ruby: This book explains the principles of REST and how different HTTP methods, particularly GET and POST, are used to interact with RESTful APIs.