Cisco 200-901 Practice Test - Questions Answers, Page 46

The diff command is used to compare the contents of two files and display the differences. The -u option stands for 'unified' and shows the differences in a unified format, which includes the lines that differ between the two files along with a few lines of context.

When running the command diff -u file1.txt file2.txt, it compares the two files and shows the differences between them.

GNU Diffutils: Unified Format

Cisco DevNet Associate Certification Guide, Sections on UCS Manager API and Python SDK

UCS Python SDK Documentation

HTTP status codes are divided into five classes:

1xx (Informational): Request received, continuing process

2xx (Success): The action was successfully received, understood, and accepted

3xx (Redirection): Further action must be taken to complete the request

4xx (Client Error): The request contains bad syntax or cannot be fulfilled

5xx (Server Error): The server failed to fulfill an apparently valid request

Thus, the series that relate to errors are:

400 series (Client Error)

500 series (Server Error)

RFC 7231, Section 6: HTTP/1.1 Semantics and Content

JSON (JavaScript Object Notation) and XML (eXtensible Markup Language) are both used for data interchange but have different characteristics:

Human Readability: JSON is often considered more human-readable because it is more concise and closely resembles the structure of programming languages like JavaScript.

Support for Arrays: JSON natively supports arrays, making it straightforward to represent lists of values. XML can represent arrays, but it does not do so natively and requires additional markup to represent arrays.

Data Mapping: XML provides extensive support for mapping data structures, including attributes and mixed content, making it suitable for complex data structures.

Data Types: JSON is lighter and provides sufficient data types for many applications (strings, numbers, objects, arrays, booleans, and null), whereas XML can be more verbose and supports a broader range of data types.

JSON vs XML - W3Schools

Python classes are a fundamental aspect of object-oriented programming (OOP) in Python. They offer several benefits: Improved Code Organization: Classes bundle data (attributes) and functionality (methods) together. This encapsulation helps keep related parts of the code together, making it easier to understand and manage. Reusability and Inheritance: Classes support inheritance, allowing the creation of new classes based on existing ones. This promotes code reuse and can lead to a more logical structure. Modularity: By using classes, you can create modules that encapsulate specific functionalities, making the code modular and easier to maintain. Encapsulation and Abstraction: Classes allow for encapsulating data and functionality, providing a clear structure and abstraction layers, which enhance code readability and maintainability.

Python Classes and Objects - W3Schools

Python Documentation on Classes

Model-driven programmability refers to the use of a consistent data model to manage and automate network devices. Key capabilities include:

Single Data Model Across the Network: Ensures uniformity and consistency in how data is represented and managed across different network devices and platforms.

Automation and Scalability: Facilitates automated network configurations and operations, enabling scalability.

Interoperability: Using standardized models (like YANG) allows for interoperability between different network devices and management tools.

Abstracted API Interfaces: Provides abstracted and consistent APIs that can be used across multiple devices, reducing the complexity of network automation scripts.

Cisco Model-Driven Programmability

A MAC (Media Access Control) address is a unique identifier assigned to network interfaces for communications at the data link layer of a network segment. Key features of a MAC address include:

Length and Format: A MAC address is 48 bits in length, typically represented as 12 hexadecimal digits (e.g., 00:1A:2B:3C:4D:5E).

Hexadecimal Representation: The 12 hexadecimal digits are often grouped into pairs separated by colons or hyphens for readability (e.g., 00:1A:2B:3C:4D:5E or 00-1A-2B-3C-4D-5E).

IEEE 802 MAC Address Standard

Cisco MAC Address Basics

Cisco DevNet Associate Certification Guide, Sections on API styles and their characteristics

Official Cisco documentation on RESTful and RPC APIs

General programming resources on synchronous vs. asynchronous API calls

Therefore, the correct mapping is:

synchronous 'Code execution must wait for an API call to return before continuing.'

asynchronous 'Code execution does not need to wait for an API call to return before continuing.'

REST 'Data is called indirectly using generic HTTP methods such as GET, POST, PUT, and DELETE.'

RPC 'Calls to request a service from a remote server must execute the same way as a request to the local system.'

Importing Libraries: The script imports the requests and json libraries necessary for making HTTP requests and handling JSON data.

URLs Definition: The url1 variable holds the Webex API endpoint for creating webhooks, and url2 is the target URL where Webex will send the messages.

Token Handling: The token variable contains the OAuth2 token required for authentication with the Webex API.

Setting Headers: The headers dictionary includes the Content-Type set to application/json and the correct Authorization header that uses the Bearer token.

Payload Preparation: The payload dictionary contains the necessary information to create the webhook, including its name, target URL, resource type, and event.

Making the Request: The requests.request method sends a POST request to the Webex API endpoint with the specified headers and payload.

Printing the Response: The response from the Webex API is printed out, encoded in 'utf-8'.

Cisco Webex API Authentication

Cisco Webex API Guide

By correctly setting the Authorization header to include the Bearer token, the developer ensures that the script can authenticate and interact with the Webex API as required.

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