200-901 Exam Dumps - Cisco Certified DevNet Associate Questions and Answers

In the provided network topology, Device E is positioned between Server 1 and Server 2. Device E, being a Layer 2 switch, will limit traffic between these servers by making forwarding decisions based on MAC addresses. If there are VLANs configured, Device E will ensure that traffic is segregated accordingly, allowing only specific traffic to pass between the servers as defined by the network policies.

References:

Cisco DevNet Associate Study Guide: Network Components (Chapter 2, Section: Switches and Their Role in Network Traffic Management).

The Python script shown in the exhibit collects CLI arguments, organizes data according to the Cisco-IOS-XE-native YANG model, and utilizes Cisco REST APIs to make configuration changes. The workflow being automated by the script is adding a new route to a device.

A. updating an existing route on the device - Incorrect. The script is adding a new route, not updating an existing one. B. adding a new route to a device - Correct. The script adds a new route using the provided prefix, mask, and IP address. C. including a route on the device and overwriting the current routes - Incorrect. The script does not indicate it overwrites existing routes. D. deleting the route that is passed through the command-line variables - Incorrect. The script is adding a route, not deleting one.

References:

Cisco IOS XE YANG Data Models

Cisco REST API Documentation

Private IP addresses are used within private networks and are not unique globally. They can be reused in different private networks without conflict.

Non-unique Addresses: Private IP addresses do not have to be unique globally, allowing them to be reused in different networks.

Repetition in Local Networks: They can be repeated within different local networks as they are not routable on the public Internet.

Options C and D correctly describe properties of private IP addresses.

A model-driven approach for infrastructure automation offers several benefits. One of the primary advantages is that it provides a small learning curve and helps system administrators with limited coding experience. By using high-level models and declarative languages, administrators can define the desired state of the infrastructure without needing to write complex scripts.

Declarative Language: Model-driven approaches use declarative languages that allow users to specify what the desired state should be, rather than how to achieve that state. This abstracts the complexity of the underlying automation processes.

References: Cisco DevNet Associate Certification Guide, Chapter on Infrastructure as Code and Model-Driven Programmability.

A MAC address (Media Access Control address) is a unique hardware address assigned to the network interface of a device. It is used for network communication at the data link layer of the OSI model.

A. unique network address that identifies the network interface of a device - Incorrect. This describes an IP address. B. unique network interface address that is provided by the DHCP server - Incorrect. MAC addresses are hardware-based, not provided by DHCP. C. unique hardware address that identifies the network interface of a device - Correct. This is the correct definition of a MAC address. D. unique hardware interface address that is provided by the central switch - Incorrect. MAC addresses are not provided by switches.

References:

Cisco MAC Address Basics

The main purpose of a code review is to identify and review errors, ensuring code quality and adherence to coding standards. It involves evaluating the code for bugs, security vulnerabilities, and performance issues, and discussing potential improvements with the team. This collaborative process helps catch errors early, fosters knowledge sharing, and improves the overall quality of the codebase.

References:

Cisco DevNet Associate Study Guide: Code Review Best Practices (Chapter 6, Section: Importance of Code Reviews).

Edge computing involves processing data closer to where it is generated (the "edge" of the network) rather than sending it to a centralized data center or cloud for processing. This approach reduces latency and bandwidth usage, providing high-speed data processing capabilities. It is particularly beneficial for IoT implementations where real-time processing and response are crucial.

References:

Cisco DevNet Associate Study Guide: IoT and Edge Computing (Chapter 9, Section: Benefits of Edge Computing).

CSRF (Cross-Site Request Forgery) is an attack that forces an end user to execute unwanted actions on a web application in which they are currently authenticated. It exploits the trust that a web application has in the user's browser.

Authenticated Session Exploit: CSRF takes advantage of the fact that the user is already authenticated, making the attack appear legitimate.

Unwanted Actions: The attacker tricks the user into performing actions without their knowledge.

Option D is correct as CSRF is the OWASP threat that exploits authenticated sessions to execute attacks.

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'.

The Ansible playbook in the exhibit is designed to automate the configuration of HSRP (Hot Standby Router Protocol) on a Cisco Nexus switch listed in the nxos_rtr inventory group. Here’s what the playbook does:

Hosts: The playbook is targeting nxos_rtr hosts.

Task: The task uses the nxos_hsrp module to configure HSRP.

Parameters: Various parameters such as group, VIP, priority, interface, authentication, and version are set for HSRP configuration.

Delegation: The configuration is delegated to the srv-1a inventory host, but it is still targeting the nxos_rtr for the actual HSRP configuration.

Therefore, the playbook is enabling HSRP on the nxos_rtr inventory host.

References:

Cisco DevNet Associate Certification Guide

Ansible Documentation for nxos_hsrp Module