200-901 Practice Test 48 — 15 Questions

Question 1

A developer is writing a Python script to interact with the Cisco DNA Center REST API. Which HTTP method should be used to retrieve a list of network devices?

Accepted Answer

GET. The GET method is the correct HTTP verb for retrieving data from a REST API without modifying server state. In Cisco DNA Center, the endpoint /dna/intent/api/v1/network-device is accessed via GET to fetch a list of network devices, as this operation is idempotent and read-only, aligning with RESTful principles.

Answer

PUT

Answer

POST

Answer

DELETE

Question 2

A team is using Git for version control. A developer accidentally committed a sensitive file. Which Git command should be used to remove the file from the repository history while keeping it locally?

Accepted Answer

git filter-branch. Git filter-branch, because it rewrites the entire repository history to remove a file from all commits, effectively purging it from the version history while leaving the local working copy untouched. This is the standard Git approach for permanently deleting sensitive data (e.g., passwords, API keys) from the repository's history.

Answer

git rebase -i

Answer

git reset --soft

Answer

git rm --cached

Question 3

Using the Cisco DNA Center API, which endpoint should be queried to retrieve the Layer 2 topology for a specific VLAN?

Accepted Answer

GET /dna/intent/api/v1/topology/l2/{vlanID}. Cisco DNA Center provides /dna/intent/api/v1/topology/l2/{vlanID} to retrieve Layer 2 topology information for a given VLAN.

Answer

GET /dna/intent/api/v1/issues

Answer

GET /dna/intent/api/v1/network-device

Answer

GET /dna/intent/api/v1/topology/physical-topology

Question 4

The exhibit shows a JSON response from a Cisco NX-OS API query for interface status. What is the operational state of interface Ethernet1/1?

Accepted Answer

down. The JSON response shows the interface Ethernet1/1 with an 'operState' value of 'down'. In Cisco NX-OS, the 'operState' field directly reflects the operational status of the interface, which is determined by Layer 1 and Layer 2 conditions such as cable connectivity, signal detection, and protocol state. Since the value is 'down', the interface is not passing traffic, making option B correct.

Answer

unknown

Answer

admin-down

Answer

up

Question 5

Which TWO of the following are valid ways to handle errors in a Python program that uses the Cisco Meraki API?

Accepted Answer

Checking the response body for an 'errors' key and handling accordingly. Option A is correct because the Cisco Meraki API returns structured JSON error payloads that include an 'errors' key (for example, {"errors":["Invalid API key"]}), so inspecting the response body for that key lets the program detect and handle API-level failures even when the HTTP status alone is ambiguous. Option B is correct because the Meraki API uses standard HTTP status codes, returning 4xx for client errors such as 400 Bad Request, 401 Unauthorized, 404 Not Found, and 429 Too Many Requests, and 5xx for server errors, so checking the status code and raising an exception for those ranges is a reliable, idiomatic error-handling pattern. Option C is wrong because assuming a 200 response and logging success ignores real failure conditions like 401, 404, or 429 and would silently mask errors. Option D is wrong because retrying indefinitely can hammer the API, trigger rate limiting (429) or account suspension, and never terminate; retries should be bounded and ideally use exponential backoff. Option E is wrong because catching a generic Exception is overly broad and can swallow unrelated bugs such as TypeError or KeyError, rather than handling specific HTTP or API errors precisely.

Answer

Assuming the API always returns 200 and logging success

Answer

Retrying the request indefinitely until success

Answer

Using a try-except block around the API call and catching generic Exception

Question 6

Which design principle suggests that a module should be responsible for a single part of the functionality?

Accepted Answer

Separation of Concerns. Separation of Concerns (SoC) is the design principle that dictates each module or component should focus on a single, well-defined part of the functionality. In software development, this reduces coupling and increases cohesion, making code easier to maintain, test, and refactor. For example, in a Python Flask web application, separating route handling, business logic, and database access into distinct modules follows SoC.

Answer

YAGNI (You Aren't Gonna Need It)

Answer

DRY (Don't Repeat Yourself)

Answer

KISS (Keep It Simple, Stupid)

Question 7

A Python script uses the `requests` library to fetch device details from Cisco DNA Center. The API returns a JSON response with nested objects. To extract the management IP address from the response stored in variable `data`, which code snippet is correct? The JSON structure is:
{
  "response": [
    {
      "managementIpAddress": "192.168.1.1",
      "hostname": "router1"
    }
  ]
}

Accepted Answer

data['response'][0]['managementIpAddress']. The response contains a list under key 'response'; correct access is via data['response'][0]['managementIpAddress'].

Answer

data.managementIpAddress

Answer

data['response']['managementIpAddress']

Answer

data.get('response')[0].get('managementIpAddress')

Question 8

A developer is writing a Python script to interact with the Cisco DNA Center REST API. Which HTTP method should be used to retrieve a list of network devices?

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

Accepted Answer

201 Created. In RESTCONF, a successful PUT request that creates a new resource returns HTTP 201 Created. This aligns with RFC 8040, where PUT can be used for both creation and replacement; the 201 response specifically indicates the resource did not exist before and was created by the request.

Answer

404 Not Found

Answer

200 OK

Answer

204 No Content

Question 9

Refer to the exhibit. A developer is parsing the output of 'show ip route' using Python. Which regular expression would extract the prefix '10.0.1.0/24'?

Accepted Answer

r'^S\s+(\d+\.\d+\.\d+\.\d+/\d+)'. The regex `^S\s+(\d+\.\d+\.\d+\.\d+/\d+)` matches lines starting with 'S' (static route) followed by whitespace, then captures the entire prefix including both the IP address and subnet mask in CIDR notation (e.g., 10.0.1.0/24). This ensures the extracted string is exactly the prefix as it appears in the 'show ip route' output.

Answer

r'^S\s+(\d+\/\d+)'

Answer

r'^S.*(\d+\.\d+\.\d+\.\d+)'

Answer

r'S\s+(\S+)'

Question 10

A team uses Git for source control. They want to ensure that all code committed to the main branch passes unit tests and linting. Which Git workflow practice best ensures this?

Accepted Answer

Using pre-commit hooks and CI pipeline to block failing commits. Pre-commit hooks run unit tests and linting locally before a commit is created, preventing failing code from entering the repository. A CI pipeline then verifies the same checks on the remote branch before allowing a merge to main, ensuring only passing code is integrated. This combination enforces quality gates at both the developer workstation and the server side, directly addressing the requirement to block failing commits.

Answer

Trunk-based development with feature toggles

Answer

Feature branching with manual merge

Answer

GitFlow with hotfix branches

Question 11

A developer creates a Dockerfile for a Python web application. Which instruction should be used to copy the application source code into the container image?

Accepted Answer

COPY. The COPY instruction copies files or directories from the build context into the container filesystem. RUN executes commands, EXPOSE documents ports, and CMD sets default command.

Answer

CMD

Answer

RUN

Answer

EXPOSE

Question 12

In the MVC (Model-View-Controller) pattern, which component is responsible for handling user input and updating the model?

Accepted Answer

Controller. In the MVC pattern, the Controller is the component that receives user input (e.g., HTTP requests, button clicks) and translates it into commands that update the Model. It acts as the intermediary between the View and the Model, ensuring that user actions trigger appropriate changes in the application's data layer.

Answer

Model

Answer

Router

Answer

View

Question 13

Which HTTP status code indicates that a POST request successfully created a new resource on the server?

Accepted Answer

201 Created. The 201 Created status code is the correct response for a POST request that successfully creates a new resource. According to RFC 7231, the server should respond with 201 and include a Location header pointing to the newly created resource's URI. This is the standard behavior for RESTful APIs when a POST operation results in resource creation.

Answer

200 OK

Answer

204 No Content

Answer

202 Accepted

Question 14

Which HTTP status code indicates a successful POST request that created a resource?

Accepted Answer

201 Created. 201 Created is the standard response for a successful POST that creates a new resource.

Answer

200 OK

Answer

400 Bad Request

Answer

204 No Content

Question 15

Which THREE of the following are best practices when using Git for a collaborative project? (Choose three.)

Accepted Answer

Use feature branches for new work.. Option A is correct because feature branches isolate new work from the main branch, allowing changes to be developed, reviewed, and tested before integration, which reduces the risk of breaking shared code. Option B is correct because regularly rebasing or merging upstream changes keeps a feature branch current, minimizes large and painful merge conflicts, and ensures the work is built against the latest codebase. Option D is correct because descriptive commit messages document the intent and context of changes, making history easier to review, debug, and audit for collaborators. Option C is not a best practice in a collaborative project because committing directly to the main branch bypasses review and can destabilize the shared branch. Option E is not a best practice because avoiding pulls prevents developers from incorporating others' changes, leading to stale local work and more severe conflicts later.

Answer

Commit directly to the main branch.

Answer

Avoid pulling from remote to prevent conflicts.