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DevNet Associate (DEVASC) 200-901 Practice Test 18

Question 170

The initial implementation fails or does not meet the expected behavior. A Python collector sometimes waits forever on an unreachable controller because requests.get is called without any timeout. Which investigation should be prioritized to diagnose the problem?

  1. Inspect prepared request URL, response status and simulated timeout handling.
  2. Inspect status code, job location, state transitions and final device evidence.
  3. Inspect connect/read timeout configuration, exception handling and total retry elapsed time.
  4. Compare HTTP verb, required JSON schema and response status with the API reference.

Explanation

Correct Answer

C:

Inspect connect/read timeout configuration, exception handling and total retry elapsed time. These are the relevant initial evidence checks for Control timeouts and retry budget. Intended action: Specify finite connect/read timeouts and an overall bounded retry budget around the request. Expected success condition: A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.

Incorrect Answers

A:

Inspect prepared request URL, response status and simulated timeout handling. This investigation primarily applies to Use requests.get with params and timeout, not the current Control timeouts and retry budget problem. Prioritize: Inspect connect/read timeout configuration, exception handling and total retry elapsed time.

B:

Inspect status code, job location, state transitions and final device evidence. This investigation primarily applies to Interpret 202 Accepted as asynchronous work, not the current Control timeouts and retry budget problem. Prioritize: Inspect connect/read timeout configuration, exception handling and total retry elapsed time.

D:

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 Control timeouts and retry budget problem. Prioritize: Inspect connect/read timeout configuration, exception handling and total retry elapsed time.

Question 171

A Cisco network automation team has this requirement: A management platform moved an inventory field from status to operationalState in v2 but an integration keeps assuming the old response schema. Which design or implementation action best addresses it?

  1. Subscribe to the supported event channel and reconcile snapshots periodically for completeness.
  2. Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation.
  3. Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification.
  4. Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.

Explanation

Correct Answer

B:

Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation. Technical reason: API versions and schema contracts determine available fields and response representations. Verify by: Tests for the selected version extract the intended operational state and flag unexpected response shape. Deployment qualification: Backward compatibility should be verified rather than assumed from a successful HTTP status.

Incorrect Answers

A:

Subscribe to the supported event channel and reconcile snapshots periodically for completeness. This instead targets the different case Event stream versus request-response polling. The described Respect versioned API fields requirement specifically calls for Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation.

C:

Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification. This instead targets the different case Reuse requests Session with certificate verification. The described Respect versioned API fields requirement specifically calls for Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation.

D:

Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected. This instead targets the different case Interpret 204 No Content (An API deletes a test client and returns HTTP 204; a Python caller immediately invokes response.json() and crashes on the empty body.). The described Respect versioned API fields requirement specifically calls for Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation.

Question 172

After deployment, an engineer must prove the proposed solution works. A management platform moved an inventory field from status to operationalState in v2 but an integration keeps assuming the old response schema. Which observed result is the most direct acceptance evidence?

  1. Tests for the selected version extract the intended operational state and flag unexpected response shape.
  2. The client waits for a terminal successful state and then fetches the completed report URI.
  3. The service returns a newly created subscription identifier and a matching stored event filter.
  4. Incremental changes arrive without one full-inventory HTTP request per event.

Explanation

Correct Answer

A:

Tests for the selected version extract the intended operational state and flag unexpected response shape. Recommended implementation: Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation. Why the observation matters: API versions and schema contracts determine available fields and response representations.

Incorrect Answers

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 Respect versioned API fields case. For this case, the decisive observation is: Tests for the selected version extract the intended operational state and flag unexpected response shape.

C:

The service returns a newly created subscription identifier and a matching stored event filter. That observation could confirm POST creates an alarm subscription, not the current Respect versioned API fields case. For this case, the decisive observation is: Tests for the selected version extract the intended operational state and flag unexpected response shape.

D:

Incremental changes arrive without one full-inventory HTTP request per event. That observation could confirm Event stream versus request-response polling, not the current Respect versioned API fields case. For this case, the decisive observation is: Tests for the selected version extract the intended operational state and flag unexpected response shape.

Question 173

A developer is explaining the underlying technical behavior. A management platform moved an inventory field from status to operationalState in v2 but an integration keeps assuming the old response schema. Which principle is most relevant to this case?

  1. Transport exceptions are distinct from normal HTTP response statuses.
  2. RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods.
  3. A documented GET query parameter belongs in the URL rather than an arbitrary request body.
  4. API versions and schema contracts determine available fields and response representations.

Explanation

Correct Answer

D:

API versions and schema contracts determine available fields and response representations. This mechanism explains Respect versioned API fields. Action: Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation. Expected confirmation: Tests for the selected version extract the intended operational state and flag unexpected response shape.

Incorrect Answers

A:

Transport exceptions are distinct from normal HTTP response statuses. This relates to Catch RequestException without hiding failures. In the current Respect versioned API fields case the operative principle is: API versions and schema contracts determine available fields and response representations.

B:

RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods. This relates to RPC action versus REST resource semantics. In the current Respect versioned API fields case the operative principle is: API versions and schema contracts determine available fields and response representations.

C:

A documented GET query parameter belongs in the URL rather than an arbitrary request body. This relates to GET filtered devices using query parameters. In the current Respect versioned API fields case the operative principle is: API versions and schema contracts determine available fields and response representations.

Question 174

A team does not apply the necessary control or correction. A management platform moved an inventory field from status to operationalState in v2 but an integration keeps assuming the old response schema. Which resulting failure or risk is most directly relevant?

  1. Treating acceptance as completion can schedule dependent changes during an in-progress upgrade.
  2. Assuming every 200 or 202 returns final report data can publish incomplete results.
  3. Granting administrator rights for a single denied method violates least privilege.
  4. Silently treating missing fields as healthy can suppress outage reporting.

Explanation

Correct Answer

D:

Silently treating missing fields as healthy can suppress outage reporting. This is the direct exposure for Respect versioned API fields. Mitigate with: Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation. Check success by: Tests for the selected version extract the intended operational state and flag unexpected response shape.

Incorrect Answers

A:

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

B:

Assuming every 200 or 202 returns final report data can publish incomplete results. This risk occurs in the different Synchronous request versus deferred job situation. For the given Respect versioned API fields requirement, the directly relevant risk is: Silently treating missing fields as healthy can suppress outage reporting.

C:

Granting administrator rights for a single denied method violates least privilege. This risk occurs in the different 403 Forbidden despite valid authentication situation. For the given Respect versioned API fields requirement, the directly relevant risk is: Silently treating missing fields as healthy can suppress outage reporting.

Question 175

The initial implementation fails or does not meet the expected behavior. A management platform moved an inventory field from status to operationalState in v2 but an integration keeps assuming the old response schema. Which investigation should be prioritized to diagnose the problem?

  1. Inspect request If-None-Match, response status and stored ETag/body pairing.
  2. Inspect negotiated API version, response body, schema changelog and parser defaults.
  3. Inspect the API method definition, transmitted fields and before/after interface representation.
  4. Verify the identifier, endpoint authorization and returned deletion status before retrying.

Explanation

Correct Answer

B:

Inspect negotiated API version, response body, schema changelog and parser defaults. These are the relevant initial evidence checks for Respect versioned API fields. Intended action: Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation. Expected success condition: Tests for the selected version extract the intended operational state and flag unexpected response shape.

Incorrect Answers

A:

Inspect request If-None-Match, response status and stored ETag/body pairing. This investigation primarily applies to Handle conditional GET with 304, not the current Respect versioned API fields problem. Prioritize: Inspect negotiated API version, response body, schema changelog and parser defaults.

C:

Inspect the API method definition, transmitted fields and before/after interface representation. This investigation primarily applies to PATCH a single interface description, not the current Respect versioned API fields problem. Prioritize: Inspect negotiated API version, response body, schema changelog and parser defaults.

D:

Verify the identifier, endpoint authorization and returned deletion status before retrying. This investigation primarily applies to DELETE an obsolete webhook subscription, not the current Respect versioned API fields problem. Prioritize: Inspect negotiated API version, response body, schema changelog and parser defaults.

Question 176

A Cisco network automation team has this requirement: 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 design or implementation action best addresses it?

  1. Serialize the payload as valid JSON and set the required application/json Content-Type header.
  2. Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly.
  3. Treat 201 Created as successful resource creation and record the new resource URI.
  4. Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS.

Explanation

Correct Answer

C:

Treat 201 Created as successful resource creation and record the new resource URI. Technical reason: 201 signals creation, not a server-side failure. Verify by: The new resource can be retrieved from the returned Location under authorized credentials. Deployment qualification: Location is not guaranteed to be present for every API, so follow the endpoint contract.

Incorrect Answers

A:

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 201 Created on POST requirement specifically calls for Treat 201 Created as successful resource creation and record the new resource URI.

B:

Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly. This instead targets the different case Acknowledge webhook quickly and queue work. The described Interpret 201 Created on POST requirement specifically calls for Treat 201 Created as successful resource creation and record the new resource URI.

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 201 Created on POST requirement specifically calls for Treat 201 Created as successful resource creation and record the new resource URI.

Question 177

After deployment, an engineer must prove the proposed solution works. 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 observed result is the most direct acceptance evidence?

  1. The collector retrieves both pages while preserving resource objects from each valid response.
  2. A role granted the documented delete privilege succeeds, while the read-only role remains forbidden.
  3. The new resource can be retrieved from the returned Location under authorized credentials.
  4. Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

Explanation

Correct Answer

C:

The new resource can be retrieved from the returned Location under authorized credentials. Recommended implementation: Treat 201 Created as successful resource creation and record the new resource URI. Why the observation matters: 201 signals creation, not a server-side failure.

Incorrect Answers

A:

The collector retrieves both pages while preserving resource objects from each valid response. That observation could confirm Parse Link header for next page, not the current Interpret 201 Created on POST case. For this case, the decisive observation is: The new resource can be retrieved from the returned Location under authorized credentials.

B:

A role granted the documented delete privilege succeeds, while the read-only role remains forbidden. That observation could confirm 403 Forbidden despite valid authentication, not the current Interpret 201 Created on POST case. For this case, the decisive observation is: The new resource can be retrieved from the returned Location under authorized credentials.

D:

Repeated calls reuse eligible connections while an untrusted certificate is still rejected. That observation could confirm Reuse requests Session with certificate verification, not the current Interpret 201 Created on POST case. For this case, the decisive observation is: The new resource can be retrieved from the returned Location under authorized credentials.

Question 178

A developer is explaining the underlying technical 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 principle is most relevant to this case?

  1. 409 represents a request conflicting with current resource state, not a network outage.
  2. Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.
  3. RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods.
  4. 201 signals creation, not a server-side failure.

Explanation

Correct Answer

D:

201 signals creation, not a server-side failure. This mechanism explains Interpret 201 Created on POST. Action: Treat 201 Created as successful resource creation and record the new resource URI. Expected confirmation: The new resource can be retrieved from the returned Location under authorized credentials.

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 201 Created on POST case the operative principle is: 201 signals creation, not a server-side failure.

B:

Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint. This relates to Back off on API rate-limit response. In the current Interpret 201 Created on POST case the operative principle is: 201 signals creation, not a server-side failure.

C:

RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods. This relates to RPC action versus REST resource semantics. In the current Interpret 201 Created on POST case the operative principle is: 201 signals creation, not a server-side failure.

Question 179

A team does not apply the necessary control or correction. 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 resulting failure or risk is most directly relevant?

  1. Broad except:pass logic can conceal genuine outages and report success.
  2. A 200-only success check can spuriously retry and create duplicate objects.
  3. Searching for headers inside the body can hide rate limits and trigger unnecessary requests.
  4. Replacing the authentication token will not repair an incompatible request media type.

Explanation

Correct Answer

B:

A 200-only success check can spuriously retry and create duplicate objects. This is the direct exposure for Interpret 201 Created on POST. Mitigate with: Treat 201 Created as successful resource creation and record the new resource URI. Check success by: The new resource can be retrieved from the returned Location under authorized credentials.

Incorrect Answers

A:

Broad except:pass logic can conceal genuine outages and report success. This risk occurs in the different Catch RequestException without hiding failures situation. For the given Interpret 201 Created on POST requirement, the directly relevant risk is: A 200-only success check can spuriously retry and create duplicate objects.

C:

Searching for headers inside the body can hide rate limits and trigger unnecessary requests. This risk occurs in the different Distinguish HTTP headers from response body situation. For the given Interpret 201 Created on POST requirement, the directly relevant risk is: A 200-only success check can spuriously retry and create duplicate objects.

D:

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 201 Created on POST requirement, the directly relevant risk is: A 200-only success check can spuriously retry and create duplicate objects.

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.

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

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