200-901 Cisco DevNet Associate (DEVASC) Free Practice Exam Questions (2025 Updated)

The HTTP status code 400 (Bad Request) is used by a REST API to indicate that the server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

Bare Metal environments refer to physical servers that run directly on the hardware without a hypervisor. They offer several characteristics related to application deployment:

Provide workloads with access to hardware features: Bare Metal environments allow applications to directly access hardware resources, which can be critical for performance-sensitive applications.

Suitable for legacy applications that do not support virtualization: Some older applications may not be compatible with virtualized environments or may require direct access to physical hardware, making Bare Metal servers an ideal choice.

Bare Metal environments: Offer direct hardware access and are suitable for certain legacy applications.

Not specifically designed for container-based workloads: While containers can run on Bare Metal, these environments are not specifically tailored for containers.

Not providing hypervisors: Bare Metal environments do not include a hypervisor layer, which is a feature of virtualized environments.

1 – D, 2 – C, 3 – A, 4 – B

Solution below as

Cisco DNA Center provides a REST API that allows users to interact with the network devices managed by the platform. To retrieve a list of network devices, an HTTP GET request is sent to the endpoint https://DNA-c_API_ADDRESS/api/v1/network-device/ . The response from this request contains a list of network devices in JSON format. This API endpoint allows for programmatic access to network device data, facilitating automation and integration with other systems. Detailed information about the Cisco DNA Center APIs can be found in the Cisco DNA Center API documentation.

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To ensure the result set is returned in reverse chronological order based on when messages were entered, we need to use the sortBy parameter with the value lastactivity. This parameter sorts the rooms by their last activity timestamp, ensuring the most recent rooms are listed first.

Example:

GET /v1/rooms?sortBy=lastactivity

References:

Cisco Webex Teams API Documentation (explains query parameters and their usage in API calls)

Cisco DevNet Associate Exam Topics: APIs and Automation (understanding how to utilize query parameters to retrieve data)

A MAC (Media Access Control) address is a unique identifier assigned to a network interface card (NIC) for communications at the data link layer of a network segment. MAC addresses are used within local area networks (LANs) to ensure that data packets are delivered to the correct hardware device. Every network interface on a device, such as a computer, router, or switch, has a unique MAC address.

The Python function shown in the exhibit performs the following operations:

It defines a function get_result().

Inside the function, it sets the url variable to the Cisco DNA Center (DNAC) API endpoint for authentication tokens.

It makes a POST request to the specified URL with HTTP Basic Authentication using the credentials DNAC_USER and DNAC_PASSWORD.

The response from the POST request is expected to be in JSON format.

It extracts the value associated with the key 'Token' from the JSON response.

Finally, it returns this token.

This function's purpose is to obtain and return an authorization token from the Cisco DNA Center API, which can be used for subsequent API requests.

The provided Ansible playbook is designed to connect to an IOS router and execute the "show run" command to retrieve the current running configuration. The configuration is then registered in a variable called config. The next task copies the output stored in the config variable to a file in a specified directory on the local machine. The file is named based on the router's hostname.

Here are the steps:

Define the hosts: The playbook targets the {{ router }} group or host.

Gather facts: Enabled with gather_facts: true to collect useful information about the target devices.

Connection type: Local, meaning the playbook runs on the local machine where Ansible is invoked.

Task 1 - ios_command:

Executes the "show run" command.

Uses the provided router credentials.

Registers the command output to the config variable.

Task 2 - copy:

Takes the first element from config.stdout (the output of the "show run" command).

Copies this content to a file in /etc/ansible/configs/, naming the file command_{{ router_hostname }}.txt.

Artifact repositories play a crucial role in Continuous Integration/Continuous Deployment (CI/CD) pipelines by:

Storing Build Artifacts: They store files needed during the build process, such as dependencies, and files generated during the build process, such as binaries.

Providing Traceability: They offer traceability and versioning of binary files, which is essential for managing builds and releases.

Search and Management: They allow developers to search and manage binary files efficiently, ensuring that the correct versions of dependencies are used.

Solution as below

To request a service ticket using the APIC-EM REST API, the following Python script can be used:

Import necessary libraries (requests and json).

Define the APIC-EM controller's URL.

Create the payload with the username and password.

Set the header to specify the content type as JSON.

Make a POST request to the /api/v1/ticket endpoint with the payload and header.

Parse the JSON response to extract the service ticket.

References:

Cisco DevNet Associate Exam Topics: APIs and Automation (understanding how to use REST APIs)

APIC-EM API Documentation (provides details on endpoints and request structures)

When configuring a Cisco IOS XE device using RESTCONF, the default data-encoding method is XML. RESTCONF is a protocol used to access configuration data and operational data using a REST-like API, and it uses XML as the default encoding method for data exchange.

XML: Used as the default encoding method for RESTCONF.

x-form-encoding: Not used by RESTCONF.

YANG: A data modeling language used to model configuration and state data manipulated by NETCONF and RESTCONF, but not an encoding method.

YAML: Not used by RESTCONF.

VLANs (Virtual Local Area Networks) serve several purposes in a network. Two primary purposes are:

Segmentation of the Network: VLANs logically segment a network into different broadcast domains, which helps in managing and controlling broadcast traffic. This segmentation helps improve performance and security by isolating certain types of traffic from others.

Creating Broadcast Domains: Each VLAN is a separate broadcast domain. By using VLANs, a network administrator can reduce the size of broadcast domains, thereby reducing broadcast traffic and increasing the efficiency of the network.

These purposes are in line with Cisco's network design principles and best practices for using VLANs. References: Cisco DevNet Associate Certification Guide, Chapter on VLANs and their uses.

To delete a directory and all of its contents (including read-only files) recursively without prompting for confirmation, the rm command with the -rf flags should be used.

rm -r: This option tells rm to remove directories and their contents recursively.

rm -f: This option tells rm to force the removal of files, ignoring nonexistent files and never prompting for confirmation.

Therefore, the correct command is rm -rf old_project. This command will recursively remove the old_project directory and all its contents without any confirmation prompts, regardless of file permissions.

References: Cisco DevNet Associate Certification Guide, Chapter on Linux and Bash Commands.

When authenticating a RESTCONF API session with a router running Cisco IOS XE software, basic authentication is commonly used. Basic authentication involves sending the username and password in the HTTP header encoded in base64 format. This method is straightforward and widely supported, though it is less secure compared to token-based authentication and should be used with HTTPS to ensure the credentials are encrypted in transit.

When package updates from a local server fail but succeed from an external repository, it is often due to misconfiguration in the update utility. One common issue is that the update utility might be configured to use a proxy, which is not required or properly set up for internal resources. This misconfiguration can cause the update utility to fail in reaching the local server.

References:

Cisco DevNet Associate Exam Topics: Infrastructure and Automation (troubleshooting and configuring network and server environments)

Linux System Administration Documentation (details on configuring package managers and handling proxy settings)

1 – B, 2 – E, 3 – C, 4 – D, 5 – A

A version control system (VCS) is essential for managing changes to source code over time. One significant advantage of a VCS is:

Facilitates resolving conflicts when merging code (Option C):

Version control systems like Git track changes made by different developers and provide tools to manage and merge these changes. When multiple developers work on the same codebase, conflicts can arise if they make changes to the same lines of code. A VCS helps in identifying these conflicts and provides mechanisms to resolve them, ensuring that the final merged code is consistent and error-free.

References:

Git Documentation on Merging

Cisco DevNet Version Control Systems

1 - d, 2 - f, 3 - b, 4 - h, 5 - i, 6 – j, 7 - g, 8 - a, 9 - c, 10 - e

1 – D, 2 – B, 3 – C, 4 – E, 5 – A