200-901 Practice Test 5 — 10 Questions

Question 1

A large enterprise uses Cisco DNA Center to manage over 500 network devices across multiple sites. The network operations team wants to automate the validation of device compliance with a baseline configuration. They have a Python script that uses the Cisco DNA Center REST API to retrieve the device configuration and compare it against a golden configuration stored in a local file. Recently, the script started failing with a 401 HTTP response code when trying to authenticate. The team confirmed the username and password are correct and that the DNA Center server is reachable. The script uses the /api/system/v1/auth/token endpoint to obtain a token. Which of the following is the most likely cause of the 401 error?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

The authentication token has expired and the script is not refreshing it.. The 401 HTTP response code indicates an authentication failure. Since the username and password are confirmed correct and the server is reachable, the most likely cause is that the script obtained a token earlier but is now using an expired token without refreshing it. Cisco DNA Center tokens have a configurable timeout (default 1 hour), and the script must re-authenticate or refresh the token before it expires.

Answer

The API endpoint requires a different HTTP method (e.g., POST vs GET).

Answer

The script is using an incorrect API version path (e.g., /v2 instead of /v1).

Answer

CORS (Cross-Origin Resource Sharing) is blocking the request.

Question 2

A network administrator needs to assign IP addresses to 50 hosts in a subnet. Which subnet mask provides the minimum required number of usable addresses while minimizing waste?

Accepted Answer

255.255.255.192 (/26). A /26 subnet mask (255.255.255.192) provides 64 total addresses per subnet, of which 62 are usable (2^6 - 2 = 62). This is the smallest power-of-two block that can accommodate 50 hosts, minimizing waste while meeting the requirement.

Answer

255.255.255.224 (/27)

Answer

255.255.255.240 (/28)

Answer

255.255.255.128 (/25)

Question 3

A developer needs to create a Python function that accepts any number of keyword arguments and prints them. Which function definition correctly uses **kwargs?

Accepted Answer

def print_args(**kwargs): print(kwargs). The **kwargs syntax in a Python function definition collects any number of keyword arguments into a dictionary. The function then prints that dictionary, which matches the requirement to accept and print any number of keyword arguments.

Answer

def print_args(*args): print(args)

Answer

def print_args(kwargs): print(kwargs)

Answer

def print_args(*kwargs): print(kwargs)

Question 4

A Python script is interacting with a REST API that returns JSON. The script needs to handle potential errors gracefully. Which TWO practices should be implemented? (Choose two.)

Accepted Answer

Use response.raise_for_status() to raise exceptions for HTTP errors.. Option A is correct because response.raise_for_status() from the requests library inspects the HTTP status code and raises an HTTPError for 4xx and 5xx responses, letting the script handle failures via try/except instead of silently processing bad data. Option C is correct because explicitly checking response.status_code (e.g., comparing against 200 or using 200 <= status_code < 300) lets the script branch on success or failure and decide whether to parse JSON or handle the error, which is essential for graceful error handling. Option B is not appropriate because a single undifferentiated try/except hides the specific cause of failures and prevents tailored handling of HTTP errors, JSON decode errors, or connection issues. Option D is wrong because assuming requests always succeed ignores network failures, timeouts, and 4xx/5xx responses, which defeats graceful error handling. Option E is wrong because calling json.loads() unconditionally can raise JSONDecodeError on non-JSON bodies (e.g., HTML error pages), so parsing should occur only after confirming a successful, JSON content-type response.

Answer

Use a single try/except block to catch all exceptions without differentiation.

Answer

Assume the request always succeeds; errors are rare.

Answer

Always parse the response body with json.loads() regardless of content type.

Question 5

Which of the following best describes the purpose of a unit test in software development?

Accepted Answer

To test individual functions or methods in isolation. Unit tests focus on verifying the correctness of the smallest testable parts of an application, such as individual functions or methods, in complete isolation from dependencies (e.g., using mocks or stubs). This ensures that each unit of code behaves as expected under controlled conditions, which is a foundational practice in test-driven development (TDD) and continuous integration pipelines. In the context of the 200-901 exam, understanding unit testing is critical for validating code quality in Cisco platforms like Cisco DNA Center or Meraki API integrations.

Answer

To check the performance of the application under load

Answer

To verify that different modules work together correctly

Answer

To test the entire system from end to end

Question 6

A network engineer is designing a data center network with leaf-spine topology. The requirement is to minimize latency and maximize bandwidth for east-west traffic. Which type of links should be used between leaf and spine switches?

Accepted Answer

Multiple parallel links with ECMP routing. In a leaf-spine topology, east-west traffic (server-to-server) must traverse the spine switches. Using multiple parallel links with Equal-Cost Multi-Path (ECMP) routing allows all links to be active simultaneously, maximizing bandwidth and minimizing latency by load-balancing traffic across all available paths. ECMP leverages Layer 3 routing (e.g., OSPF or BGP) to forward packets over multiple equal-cost paths, which is ideal for the non-blocking, high-throughput design of leaf-spine architectures.

Answer

Multiple links with VSS

Answer

Single link with LACP

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Single link with STP

Question 7

A Python script using the Cisco Meraki API v1 is failing with a 429 status code. What is the recommended course of action?

Accepted Answer

Implement retry logic with exponential backoff and respect Retry-After header. A 429 status code indicates rate limiting, meaning the client has exceeded the allowed number of requests per time window. The correct response is to implement retry logic with exponential backoff and respect the Retry-After header, which tells the client how long to wait before retrying. This is a standard best practice for REST APIs, including Cisco Meraki's API v1, to handle rate limits gracefully without overwhelming the server.

Answer

Change the API endpoint to a different region

Answer

Check the API token

Answer

Increase the rate limit on the dashboard

Question 8

A developer is working with the Cisco SD-WAN vManage API to monitor overlay tunnels. They need to retrieve a list of all devices with their site IDs and IP addresses. Which API endpoint is most appropriate?

Accepted Answer

GET /dataservice/device. The GET /dataservice/device endpoint returns a list of all devices managed by the Cisco SD-WAN vManage, including their site IDs and IP addresses. This is the correct endpoint for retrieving device inventory details, as it provides the necessary fields like 'deviceId', 'system-ip', and 'site-id' in the response.

Answer

GET /dataservice/device/monitor

Answer

GET /dataservice/device/device

Answer

GET /dataservice/device/overlay

Question 9

A developer wants to send a message to a Webex room using the API. Which HTTP method and endpoint should they use?

Accepted Answer

POST /v1/messages. To send a message, use POST to /v1/messages with roomId or toPersonEmail.

Answer

POST /v1/rooms

Answer

PUT /v1/messages

Answer

GET /v1/messages

Question 10

A network team uses an Ansible playbook to automate the configuration of multiple Cisco IOS XE devices. The playbook includes the 'ios_config' module. Which of the following best describes the purpose of the 'provider' parameter in the ios_config module?

Accepted Answer

It defines the connection details for the device.. The 'provider' parameter in the ios_config module is a dictionary that encapsulates the connection details required to access the network device, such as hostname, username, password, port, and transport protocol (e.g., SSH). This allows the module to establish a session with the Cisco IOS XE device before applying configuration changes. Without the provider, the module would not know how to reach or authenticate to the target device.

Answer

It identifies the name of the playbook being used.

Answer

It specifies the configuration lines to be applied.

Answer

It sets the timeout for the module execution.