Pass the Cisco Cisco Certified DevNet Associate 200-901 Questions and answers with CertsForce

Injection attacks occur when untrusted data is sent to an interpreter as part of a command or query. The attacker's hostile data can trick the interpreter into executing unintended commands or accessing data without proper authorization. Common types of injection attacks include SQL injection, command injection, and LDAP injection. These types of attacks exploit vulnerabilities in how an application processes input data, allowing attackers to inject malicious commands or queries into the system.

The Ansible playbook provided in the exhibit performs the following tasks:

Uses the ios_command module to issue the show conf command on the CISCO_ROUTER_01 device.

Registers the output of the command into the variable config.

Copies the content of config.stdout[0] (the first line of the command output) to a file in /etc/ansible/configs/.

This sequence of tasks effectively backs up the running configuration of the router by capturing the current configuration output and saving it to a file.

References:

Ansible ios_command Module

Ansible Playbook Basics

When consuming a RESTful API that returns large amounts of data, pagination is commonly used to divide the data into manageable chunks. Pagination helps reduce the load on the server and the client by providing only a subset of the total data in each response. The client can request the next set of data using parameters such as page or limit.

The provided Python script is designed to use the RESTCONF protocol to interact with a network device. RESTCONF is a protocol used for accessing data defined in YANG, using RESTful principles.

restconf: This is the correct choice to complete the script as it indicates that the RESTCONF protocol is being used to communicate with the device.

The relevant line in the script should read:

response = requests.post(f'https://{self.hostname}:{self.port}/restconf/operations/cisco-ia:save-config/ ', headers=self.headers, auth=(self.username, self.password), verify=False)

References:

Cisco RESTCONF Protocol Guide

The HTTP status code 201 (Created) indicates that a request has been fulfilled and resulted in a new resource being created.

201 Created: This status code is used when a new resource is successfully created as a result of a POST request.

Use Case: Commonly returned in response to a POST request that adds a new item to a collection.

References:

HTTP Status Codes: HTTP Status Code 201

Bandwidth is the network constraint that affects the performance of an application as the number of users accessing the application increases. Bandwidth refers to the maximum rate of data transfer across a network path. If the bandwidth is insufficient to handle the increased traffic, the application performance will degrade, leading to slower response times and potential timeouts.

References:

Cisco DevNet Documentation - Network Performance

Cisco DevNet Associate Certification Guide

The command git branch -D test forcefully deletes the local branch named test, even if it has unmerged changes.

Deleting Branches: git branch -D is used to delete a branch forcefully.

Force Deletion: The -D flag forcefully deletes the branch regardless of its merge status.

Option C correctly describes the action of the command, which is to delete the test branch.

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)

References:

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

A 401 error indicates unauthorized access. To fix this, the script needs to include the appropriate authorization token in the request headers.

Authorization Header: The Authorization header with a Bearer token is commonly used for OAuth 2.0 authorization.

Bearer Token: This token is used to authenticate API requests securely.

Option A is correct as adding the Authorization header with the Bearer token is the proper way to authenticate the request and resolve the 401 error.