200-901 Exam Dumps - DevNet Associate (DEVASC)

In this scenario, the developer is retrieving a large number of messages from a Cisco Webex space, and the server only sends a subset of the total messages at a time. This is an example of pagination, where the data is split into multiple pages or chunks, and the client must make additional requests to retrieve the next set of data.

Pagination: This is a common API constraint used to handle large datasets by breaking them into manageable pages.

Subsequent Requests: The client needs to send subsequent requests to get the remaining data.

Option C is correct as it describes the constraint where data is divided into multiple pages and requires additional requests to retrieve all data.

An HTTP 502 Bad Gateway error indicates that the server acting as a gateway or proxy received an invalid response from the upstream server. This suggests there may be an issue with the configuration or availability of the server behind the load balancer.

HTTP 502 Error: This error occurs when the load balancer or gateway receives an invalid response from the backend server.

Server Configuration: The issue is likely due to misconfiguration or problems with the backend server that needs to be resolved.

Option A is correct as it identifies that the issue lies with the server configuration behind the load balancer.

To protect secrets such as API URLs, shared keys, and other application configurations, it is best practice to: C. Ensure they never appear in plaintext at rest or in transit. Encrypt sensitive data both when it is stored (at rest) and when it is transmitted over the network (in transit). This prevents unauthorized access and exposure. E. Always store secrets in a secure vault. Use dedicated secret management tools like HashiCorp Vault, AWS Secrets Manager, or Azure Key Vault to store and manage sensitive information securely. These tools provide mechanisms for access control, audit logging, and automatic rotation of secrets.

References:

Securing Secrets

HashiCorp Vault

AWS Secrets Manager

Cross-Site Request Forgery (CSRF) is a type of attack that forges a malicious HTTP request and sends it from a user's browser to a different site where the user is authenticated. The attacker tricks the user into executing unwanted actions on a web application in which the user is currently authenticated. This can lead to unauthorized actions being performed on the user's behalf.

References:

Cisco DevNet Associate Certification Guide

OWASP CSRF Prevention Cheat Sheet

Organizing code into modules improves maintainability by encapsulating functionality into smaller, more manageable pieces. This modular approach allows developers to focus on specific sections of code without being overwhelmed by the entire codebase. It also makes it easier to debug, test, and update parts of the application independently, enhancing overall code quality and maintainability.

References:

Modular Programming - Python Documentation

Cisco DevNet Sandbox provides developers with access to a variety of Cisco technologies in a lab environment. It is an essential resource for developers who want to test and build applications using Cisco APIs and products.

DevNet Sandbox: This platform offers pre-configured, ready-to-use environments that allow developers to experiment with Cisco products, including security products, without the need to set up and configure their own infrastructure.

References:

Cisco DevNet Sandbox

The Python script provided makes a GET request to the Cisco DNA Center API to retrieve a list of network devices. The script processes the JSON response, iterates over each item in the response, and prints the hostname and management IP address of each device.

The process_devices function constructs the API URL using the dnac['host'].

It sends an HTTP GET request with the necessary headers, including the authentication token.

The response is parsed as JSON and stored in the data variable.

The script then loops through the data['response'] list, printing the hostname and managementIpAddress for each device.

For Basic Authentication in REST APIs, the Base64 encoded credentials must be included in the header of the HTTP request. The correct method is to include the following header in the request:

Authorization: Basic am9objowMTlzNDU2Nzg=

References: Cisco DevNet Associate Certification Guide, Chapter on REST API Authentication methods.