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DevNet Associate (DEVASC) 200-901 Practice Test 19

Question 180

The initial implementation fails or does not meet the expected behavior. A device-management service returns HTTP 201 and a Location header after a POST; a client incorrectly treats anything other than 200 as failure. Which investigation should be prioritized to diagnose the problem?

  1. Inspect outbound bytes, Content-Type and the server's validation response.
  2. Inspect negotiated API version, response body, schema changelog and parser defaults.
  3. Inspect session adapter behavior, certificate trust and request timing with a test endpoint.
  4. Inspect response code, Location header and the newly created object's identifier.

Explanation

Correct Answer

D:

Inspect response code, Location header and the newly created object's identifier. These are the relevant initial evidence checks for Interpret 201 Created on POST. Intended action: Treat 201 Created as successful resource creation and record the new resource URI. Expected success condition: The new resource can be retrieved from the returned Location under authorized credentials.

Incorrect Answers

A:

Inspect outbound bytes, Content-Type and the server's validation response. This investigation primarily applies to Use requests.post json parameter, not the current Interpret 201 Created on POST problem. Prioritize: Inspect response code, Location header and the newly created object's identifier.

B:

Inspect negotiated API version, response body, schema changelog and parser defaults. This investigation primarily applies to Respect versioned API fields, not the current Interpret 201 Created on POST problem. Prioritize: Inspect response code, Location header and the newly created object's identifier.

C:

Inspect session adapter behavior, certificate trust and request timing with a test endpoint. This investigation primarily applies to Reuse requests Session with certificate verification, not the current Interpret 201 Created on POST problem. Prioritize: Inspect response code, Location header and the newly created object's identifier.

Question 181

A Cisco network automation team has this requirement: A controller returns 202 with a job URL after a firmware upgrade request; automation declares upgrade complete immediately. Which design or implementation action best addresses it?

  1. Record the accepted job and poll or subscribe to its documented completion state before reporting success.
  2. Use the asynchronous job workflow and obtain completion status before consuming result artifacts.
  3. Register a documented event webhook and expose a secured reachable receiver for state-change callbacks.
  4. Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS.

Explanation

Correct Answer

A:

Record the accepted job and poll or subscribe to its documented completion state before reporting success. Technical reason: 202 Accepted means a request was accepted for processing, not necessarily finished. Verify by: The workflow reports complete only after the job status becomes successful and device version is verified. Deployment qualification: Accepted operations may later fail and require an explicit failed-job branch.

Incorrect Answers

B:

Use the asynchronous job workflow and obtain completion status before consuming result artifacts. This instead targets the different case Synchronous request versus deferred job. The described Interpret 202 Accepted as asynchronous work requirement specifically calls for Record the accepted job and poll or subscribe to its documented completion state before reporting success.

C:

Register a documented event webhook and expose a secured reachable receiver for state-change callbacks. This instead targets the different case Webhook push instead of polling. The described Interpret 202 Accepted as asynchronous work requirement specifically calls for Record the accepted job and poll or subscribe to its documented completion state before reporting success.

D:

Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS. This instead targets the different case Basic authentication for an approved legacy service. The described Interpret 202 Accepted as asynchronous work requirement specifically calls for Record the accepted job and poll or subscribe to its documented completion state before reporting success.

Question 182

After deployment, an engineer must prove the proposed solution works. A controller returns 202 with a job URL after a firmware upgrade request; automation declares upgrade complete immediately. Which observed result is the most direct acceptance evidence?

  1. The workflow reports complete only after the job status becomes successful and device version is verified.
  2. One event produces one queued job and the provider stops retrying after successful acknowledgement.
  3. The server authenticates the lab account and the request does not expose credentials in logs.
  4. A fixture of 240 clients produces exactly 240 unique IDs from three pages.

Explanation

Correct Answer

A:

The workflow reports complete only after the job status becomes successful and device version is verified. Recommended implementation: Record the accepted job and poll or subscribe to its documented completion state before reporting success. Why the observation matters: 202 Accepted means a request was accepted for processing, not necessarily finished.

Incorrect Answers

B:

One event produces one queued job and the provider stops retrying after successful acknowledgement. That observation could confirm Acknowledge webhook quickly and queue work, not the current Interpret 202 Accepted as asynchronous work case. For this case, the decisive observation is: The workflow reports complete only after the job status becomes successful and device version is verified.

C:

The server authenticates the lab account and the request does not expose credentials in logs. That observation could confirm Basic authentication for an approved legacy service, not the current Interpret 202 Accepted as asynchronous work case. For this case, the decisive observation is: The workflow reports complete only after the job status becomes successful and device version is verified.

D:

A fixture of 240 clients produces exactly 240 unique IDs from three pages. That observation could confirm Traverse cursor-based pagination, not the current Interpret 202 Accepted as asynchronous work case. For this case, the decisive observation is: The workflow reports complete only after the job status becomes successful and device version is verified.

Question 183

A developer is explaining the underlying technical behavior. A controller returns 202 with a job URL after a firmware upgrade request; automation declares upgrade complete immediately. Which principle is most relevant to this case?

  1. 409 represents a request conflicting with current resource state, not a network outage.
  2. Webhook signatures provide message integrity and origin evidence using a secret-derived digest.
  3. Event-driven delivery decouples producers from consumers and reduces redundant polling.
  4. 202 Accepted means a request was accepted for processing, not necessarily finished.

Explanation

Correct Answer

D:

202 Accepted means a request was accepted for processing, not necessarily finished. This mechanism explains Interpret 202 Accepted as asynchronous work. Action: Record the accepted job and poll or subscribe to its documented completion state before reporting success. Expected confirmation: The workflow reports complete only after the job status becomes successful and device version is verified.

Incorrect Answers

A:

409 represents a request conflicting with current resource state, not a network outage. This relates to 409 Conflict on stale configuration revision. In the current Interpret 202 Accepted as asynchronous work case the operative principle is: 202 Accepted means a request was accepted for processing, not necessarily finished.

B:

Webhook signatures provide message integrity and origin evidence using a secret-derived digest. This relates to Verify webhook signature on callback. In the current Interpret 202 Accepted as asynchronous work case the operative principle is: 202 Accepted means a request was accepted for processing, not necessarily finished.

C:

Event-driven delivery decouples producers from consumers and reduces redundant polling. This relates to Event stream versus request-response polling. In the current Interpret 202 Accepted as asynchronous work case the operative principle is: 202 Accepted means a request was accepted for processing, not necessarily finished.

Question 184

A team does not apply the necessary control or correction. A controller returns 202 with a job URL after a firmware upgrade request; automation declares upgrade complete immediately. Which resulting failure or risk is most directly relevant?

  1. Silently treating missing fields as healthy can suppress outage reporting.
  2. Replacing the authentication token will not repair an incompatible request media type.
  3. A partial PUT may overwrite or reset omitted settings depending on the service contract.
  4. Treating acceptance as completion can schedule dependent changes during an in-progress upgrade.

Explanation

Correct Answer

D:

Treating acceptance as completion can schedule dependent changes during an in-progress upgrade. This is the direct exposure for Interpret 202 Accepted as asynchronous work. Mitigate with: Record the accepted job and poll or subscribe to its documented completion state before reporting success. Check success by: The workflow reports complete only after the job status becomes successful and device version is verified.

Incorrect Answers

A:

Silently treating missing fields as healthy can suppress outage reporting. This risk occurs in the different Respect versioned API fields situation. For the given Interpret 202 Accepted as asynchronous work requirement, the directly relevant risk is: Treating acceptance as completion can schedule dependent changes during an in-progress upgrade.

B:

Replacing the authentication token will not repair an incompatible request media type. This risk occurs in the different 415 Unsupported Media Type on JSON endpoint situation. For the given Interpret 202 Accepted as asynchronous work requirement, the directly relevant risk is: Treating acceptance as completion can schedule dependent changes during an in-progress upgrade.

C:

A partial PUT may overwrite or reset omitted settings depending on the service contract. This risk occurs in the different PATCH a single interface description situation. For the given Interpret 202 Accepted as asynchronous work requirement, the directly relevant risk is: Treating acceptance as completion can schedule dependent changes during an in-progress upgrade.

Question 185

The initial implementation fails or does not meet the expected behavior. A controller returns 202 with a job URL after a firmware upgrade request; automation declares upgrade complete immediately. Which investigation should be prioritized to diagnose the problem?

  1. Inspect job-id fields, polling instructions and final-state payload shape.
  2. Inspect response headers, request intervals and maximum attempt count.
  3. Compare HTTP verb, required JSON schema and response status with the API reference.
  4. Inspect status code, job location, state transitions and final device evidence.

Explanation

Correct Answer

D:

Inspect status code, job location, state transitions and final device evidence. These are the relevant initial evidence checks for Interpret 202 Accepted as asynchronous work. Intended action: Record the accepted job and poll or subscribe to its documented completion state before reporting success. Expected success condition: The workflow reports complete only after the job status becomes successful and device version is verified.

Incorrect Answers

A:

Inspect job-id fields, polling instructions and final-state payload shape. This investigation primarily applies to Synchronous request versus deferred job, not the current Interpret 202 Accepted as asynchronous work problem. Prioritize: Inspect status code, job location, state transitions and final device evidence.

B:

Inspect response headers, request intervals and maximum attempt count. This investigation primarily applies to Back off on API rate-limit response, not the current Interpret 202 Accepted as asynchronous work problem. Prioritize: Inspect status code, job location, state transitions and final device evidence.

C:

Compare HTTP verb, required JSON schema and response status with the API reference. This investigation primarily applies to POST creates an alarm subscription, not the current Interpret 202 Accepted as asynchronous work problem. Prioritize: Inspect status code, job location, state transitions and final device evidence.

Question 186

A Cisco network automation team has this requirement: An API deletes a test client and returns HTTP 204; a Python caller immediately invokes response.json() and crashes on the empty body. Which design or implementation action best addresses it?

  1. Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.
  2. Serialize the payload as valid JSON and set the required application/json Content-Type header.
  3. Use the documented PATCH operation with the targeted description field and concurrency prerequisites.
  4. Check role/permission authorization for the operation instead of rotating valid credentials blindly.

Explanation

Correct Answer

A:

Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected. Technical reason: 204 No Content deliberately indicates success without a response payload. Verify by: The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone. Deployment qualification: A separate verification GET may be needed when the operation has asynchronous effects.

Incorrect Answers

B:

Serialize the payload as valid JSON and set the required application/json Content-Type header. This instead targets the different case 415 Unsupported Media Type on JSON endpoint. The described Interpret 204 No Content requirement specifically calls for Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.

C:

Use the documented PATCH operation with the targeted description field and concurrency prerequisites. This instead targets the different case PATCH a single interface description. The described Interpret 204 No Content requirement specifically calls for Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.

D:

Check role/permission authorization for the operation instead of rotating valid credentials blindly. This instead targets the different case 403 Forbidden despite valid authentication. The described Interpret 204 No Content requirement specifically calls for Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.

Question 187

After deployment, an engineer must prove the proposed solution works. An API deletes a test client and returns HTTP 204; a Python caller immediately invokes response.json() and crashes on the empty body. Which observed result is the most direct acceptance evidence?

  1. After a simulated limit response, the client waits and succeeds without a tight retry storm.
  2. The client waits for a terminal successful state and then fetches the completed report URI.
  3. The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.
  4. DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.

Explanation

Correct Answer

C:

The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone. Recommended implementation: Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected. Why the observation matters: 204 No Content deliberately indicates success without a response payload.

Incorrect Answers

A:

After a simulated limit response, the client waits and succeeds without a tight retry storm. That observation could confirm Back off on API rate-limit response, not the current Interpret 204 No Content case. For this case, the decisive observation is: The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.

B:

The client waits for a terminal successful state and then fetches the completed report URI. That observation could confirm Synchronous request versus deferred job, not the current Interpret 204 No Content case. For this case, the decisive observation is: The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.

D:

DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks. That observation could confirm Catch RequestException without hiding failures, not the current Interpret 204 No Content case. For this case, the decisive observation is: The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.

Question 188

A developer is explaining the underlying technical behavior. An API deletes a test client and returns HTTP 204; a Python caller immediately invokes response.json() and crashes on the empty body. Which principle is most relevant to this case?

  1. The response media type indicates how the body should be interpreted.
  2. 204 No Content deliberately indicates success without a response payload.
  3. Headers convey protocol metadata while the body carries a representation of application data.
  4. The requests library encodes query parameters and supports explicit connection/read time limits.

Explanation

Correct Answer

B:

204 No Content deliberately indicates success without a response payload. This mechanism explains Interpret 204 No Content. Action: Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected. Expected confirmation: The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.

Incorrect Answers

A:

The response media type indicates how the body should be interpreted. This relates to Content-Type guards JSON parsing. In the current Interpret 204 No Content case the operative principle is: 204 No Content deliberately indicates success without a response payload.

C:

Headers convey protocol metadata while the body carries a representation of application data. This relates to Distinguish HTTP headers from response body. In the current Interpret 204 No Content case the operative principle is: 204 No Content deliberately indicates success without a response payload.

D:

The requests library encodes query parameters and supports explicit connection/read time limits. This relates to Use requests.get with params and timeout. In the current Interpret 204 No Content case the operative principle is: 204 No Content deliberately indicates success without a response payload.

Question 189

A team does not apply the necessary control or correction. An API deletes a test client and returns HTTP 204; a Python caller immediately invokes response.json() and crashes on the empty body. Which resulting failure or risk is most directly relevant?

  1. Blind JSON parsing can misclassify an intermediary login page as a broken API field.
  2. Putting Basic credentials in a URL leaks them through browser and proxy histories.
  3. Blocking the HTTP callback can trigger retries and duplicate work execution.
  4. Blind JSON parsing on an empty success response creates a false error condition.

Explanation

Correct Answer

D:

Blind JSON parsing on an empty success response creates a false error condition. This is the direct exposure for Interpret 204 No Content. Mitigate with: Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected. Check success by: The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.

Incorrect Answers

A:

Blind JSON parsing can misclassify an intermediary login page as a broken API field. This risk occurs in the different Content-Type guards JSON parsing situation. For the given Interpret 204 No Content requirement, the directly relevant risk is: Blind JSON parsing on an empty success response creates a false error condition.

B:

Putting Basic credentials in a URL leaks them through browser and proxy histories. This risk occurs in the different Basic authentication for an approved legacy service situation. For the given Interpret 204 No Content requirement, the directly relevant risk is: Blind JSON parsing on an empty success response creates a false error condition.

C:

Blocking the HTTP callback can trigger retries and duplicate work execution. This risk occurs in the different Acknowledge webhook quickly and queue work situation. For the given Interpret 204 No Content requirement, the directly relevant risk is: Blind JSON parsing on an empty success response creates a false error condition.

Question 190

The initial implementation fails or does not meet the expected behavior. An API deletes a test client and returns HTTP 204; a Python caller immediately invokes response.json() and crashes on the empty body. Which investigation should be prioritized to diagnose the problem?

  1. Inspect the endpoint's parameter location and the actual URL captured in request logs.
  2. Inspect revision/ETag tokens, competing updates and the diff between desired and current state.
  3. Inspect status code, body length and the endpoint's documented success responses.
  4. Inspect request headers, raw payload bytes and accepted media types in API docs.

Explanation

Correct Answer

C:

Inspect status code, body length and the endpoint's documented success responses. These are the relevant initial evidence checks for Interpret 204 No Content. Intended action: Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected. Expected success condition: The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.

Incorrect Answers

A:

Inspect the endpoint's parameter location and the actual URL captured in request logs. This investigation primarily applies to GET filtered devices using query parameters, not the current Interpret 204 No Content problem. Prioritize: Inspect status code, body length and the endpoint's documented success responses.

B:

Inspect revision/ETag tokens, competing updates and the diff between desired and current state. This investigation primarily applies to 409 Conflict on stale configuration revision, not the current Interpret 204 No Content problem. Prioritize: Inspect status code, body length and the endpoint's documented success responses.

D:

Inspect request headers, raw payload bytes and accepted media types in API docs. This investigation primarily applies to 415 Unsupported Media Type on JSON endpoint, not the current Interpret 204 No Content problem. Prioritize: Inspect status code, body length and the endpoint's documented success responses.

DevNet Associate (DEVASC) (200-901) Practice Tests

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