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DevNet Associate (DEVASC) 200-901 Practice Test 26

Question 250

The initial implementation fails or does not meet the expected behavior. An operator needs to trigger a long-running inventory reconciliation, yet the API returns a job identifier immediately rather than the finished report. Which investigation should be prioritized to diagnose the problem?

  1. Inspect status code, job location, state transitions and final device evidence.
  2. Inspect WWW-Authenticate details, token expiry and secret rotation logs.
  3. Inspect job-id fields, polling instructions and final-state payload shape.
  4. Compare HTTP verb, required JSON schema and response status with the API reference.

Explanation

Correct Answer

C:

Inspect job-id fields, polling instructions and final-state payload shape. These are the relevant initial evidence checks for Synchronous request versus deferred job. Intended action: Use the asynchronous job workflow and obtain completion status before consuming result artifacts. Expected success condition: The client waits for a terminal successful state and then fetches the completed report URI.

Incorrect Answers

A:

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 Synchronous request versus deferred job problem. Prioritize: Inspect job-id fields, polling instructions and final-state payload shape.

B:

Inspect WWW-Authenticate details, token expiry and secret rotation logs. This investigation primarily applies to 401 Unauthorized on expired bearer token, not the current Synchronous request versus deferred job problem. Prioritize: Inspect job-id fields, polling instructions and final-state payload shape.

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 Synchronous request versus deferred job problem. Prioritize: Inspect job-id fields, polling instructions and final-state payload shape.

Question 251

A Cisco network automation team has this requirement: A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource. Which design or implementation action best addresses it?

  1. Use the documented PATCH operation with the targeted description field and concurrency prerequisites.
  2. Check role/permission authorization for the operation instead of rotating valid credentials blindly.
  3. Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.
  4. Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field.

Explanation

Correct Answer

D:

Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. Technical reason: RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods. Verify by: A reboot task appears in the controller's operations history for the chosen device. Deployment qualification: Some REST services intentionally expose action subresources, so style alone does not determine support.

Incorrect Answers

A:

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 RPC action versus REST resource semantics requirement specifically calls for Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field.

B:

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 RPC action versus REST resource semantics requirement specifically calls for Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field.

C:

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 RPC action versus REST resource semantics requirement specifically calls for Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field.

Question 252

After deployment, an engineer must prove the proposed solution works. A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource. Which observed result is the most direct acceptance evidence?

  1. A simulated device-down event arrives at the receiver promptly without a scheduled inventory scan.
  2. After a simulated limit response, the client waits and succeeds without a tight retry storm.
  3. DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.
  4. A reboot task appears in the controller's operations history for the chosen device.

Explanation

Correct Answer

D:

A reboot task appears in the controller's operations history for the chosen device. Recommended implementation: Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. Why the observation matters: RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods.

Incorrect Answers

A:

A simulated device-down event arrives at the receiver promptly without a scheduled inventory scan. That observation could confirm Webhook push instead of polling, not the current RPC action versus REST resource semantics case. For this case, the decisive observation is: A reboot task appears in the controller's operations history for the chosen device.

B:

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 RPC action versus REST resource semantics case. For this case, the decisive observation is: A reboot task appears in the controller's operations history for the chosen device.

C:

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 RPC action versus REST resource semantics case. For this case, the decisive observation is: A reboot task appears in the controller's operations history for the chosen device.

Question 253

A developer is explaining the underlying technical behavior. A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource. Which principle is most relevant to this case?

  1. API versions and schema contracts determine available fields and response representations.
  2. POST commonly submits a representation to create or process a resource under the target collection.
  3. RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods.
  4. Pagination breaks large collections into bounded responses navigated through continuation metadata.

Explanation

Correct Answer

C:

RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods. This mechanism explains RPC action versus REST resource semantics. Action: Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. Expected confirmation: A reboot task appears in the controller's operations history for the chosen device.

Incorrect Answers

A:

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

B:

POST commonly submits a representation to create or process a resource under the target collection. This relates to POST creates an alarm subscription. In the current RPC action versus REST resource semantics case the operative principle is: RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods.

D:

Pagination breaks large collections into bounded responses navigated through continuation metadata. This relates to Traverse cursor-based pagination. In the current RPC action versus REST resource semantics case the operative principle is: RPC-style interfaces model named operations while REST-style interfaces commonly model resources and standard methods.

Question 254

A team does not apply the necessary control or correction. A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource. Which resulting failure or risk is most directly relevant?

  1. Assuming every remote command is a CRUD field can target an unsupported endpoint.
  2. Blind JSON parsing can misclassify an intermediary login page as a broken API field.
  3. Granting administrator rights for a single denied method violates least privilege.
  4. Ignoring Link pagination yields incomplete collections even when each request succeeds.

Explanation

Correct Answer

A:

Assuming every remote command is a CRUD field can target an unsupported endpoint. This is the direct exposure for RPC action versus REST resource semantics. Mitigate with: Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. Check success by: A reboot task appears in the controller's operations history for the chosen device.

Incorrect Answers

B:

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 RPC action versus REST resource semantics requirement, the directly relevant risk is: Assuming every remote command is a CRUD field can target an unsupported endpoint.

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 RPC action versus REST resource semantics requirement, the directly relevant risk is: Assuming every remote command is a CRUD field can target an unsupported endpoint.

D:

Ignoring Link pagination yields incomplete collections even when each request succeeds. This risk occurs in the different Parse Link header for next page situation. For the given RPC action versus REST resource semantics requirement, the directly relevant risk is: Assuming every remote command is a CRUD field can target an unsupported endpoint.

Question 255

The initial implementation fails or does not meet the expected behavior. A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource. Which investigation should be prioritized to diagnose the problem?

  1. Inspect status code, job location, state transitions and final device evidence.
  2. Inspect raw response status line, headers and JSON payload separately.
  3. Compare HTTP verb, required JSON schema and response status with the API reference.
  4. Inspect SDK method signature, operation result and device identifier semantics.

Explanation

Correct Answer

D:

Inspect SDK method signature, operation result and device identifier semantics. These are the relevant initial evidence checks for RPC action versus REST resource semantics. Intended action: Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. Expected success condition: A reboot task appears in the controller's operations history for the chosen device.

Incorrect Answers

A:

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 RPC action versus REST resource semantics problem. Prioritize: Inspect SDK method signature, operation result and device identifier semantics.

B:

Inspect raw response status line, headers and JSON payload separately. This investigation primarily applies to Distinguish HTTP headers from response body, not the current RPC action versus REST resource semantics problem. Prioritize: Inspect SDK method signature, operation result and device identifier semantics.

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 RPC action versus REST resource semantics problem. Prioritize: Inspect SDK method signature, operation result and device identifier semantics.

Question 256

A Cisco network automation team has this requirement: A monitoring service offers an event stream for thousands of interface changes, but a team repeatedly requests full inventory snapshots for each update. Which design or implementation action best addresses it?

  1. Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation.
  2. Check role/permission authorization for the operation instead of rotating valid credentials blindly.
  3. Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.
  4. Subscribe to the supported event channel and reconcile snapshots periodically for completeness.

Explanation

Correct Answer

D:

Subscribe to the supported event channel and reconcile snapshots periodically for completeness. Technical reason: Event-driven delivery decouples producers from consumers and reduces redundant polling. Verify by: Incremental changes arrive without one full-inventory HTTP request per event. Deployment qualification: Streams need reconnection and gap recovery; event delivery alone need not be exactly once.

Incorrect Answers

A:

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

B:

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 Event stream versus request-response polling requirement specifically calls for Subscribe to the supported event channel and reconcile snapshots periodically for completeness.

C:

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 Event stream versus request-response polling requirement specifically calls for Subscribe to the supported event channel and reconcile snapshots periodically for completeness.

Question 257

After deployment, an engineer must prove the proposed solution works. A monitoring service offers an event stream for thousands of interface changes, but a team repeatedly requests full inventory snapshots for each update. Which observed result is the most direct acceptance evidence?

  1. A simulated device-down event arrives at the receiver promptly without a scheduled inventory scan.
  2. The same semantic request is accepted with the proper media type and valid field values.
  3. Incremental changes arrive without one full-inventory HTTP request per event.
  4. A correctly signed fixture is accepted and a tampered body or invalid signature is rejected.

Explanation

Correct Answer

C:

Incremental changes arrive without one full-inventory HTTP request per event. Recommended implementation: Subscribe to the supported event channel and reconcile snapshots periodically for completeness. Why the observation matters: Event-driven delivery decouples producers from consumers and reduces redundant polling.

Incorrect Answers

A:

A simulated device-down event arrives at the receiver promptly without a scheduled inventory scan. That observation could confirm Webhook push instead of polling, not the current Event stream versus request-response polling case. For this case, the decisive observation is: Incremental changes arrive without one full-inventory HTTP request per event.

B:

The same semantic request is accepted with the proper media type and valid field values. That observation could confirm 415 Unsupported Media Type on JSON endpoint, not the current Event stream versus request-response polling case. For this case, the decisive observation is: Incremental changes arrive without one full-inventory HTTP request per event.

D:

A correctly signed fixture is accepted and a tampered body or invalid signature is rejected. That observation could confirm Verify webhook signature on callback, not the current Event stream versus request-response polling case. For this case, the decisive observation is: Incremental changes arrive without one full-inventory HTTP request per event.

Question 258

A developer is explaining the underlying technical behavior. A monitoring service offers an event stream for thousands of interface changes, but a team repeatedly requests full inventory snapshots for each update. Which principle is most relevant to this case?

  1. Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks.
  2. Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.
  3. 403 often indicates that the principal is known but lacks permission to perform the action.
  4. Event-driven delivery decouples producers from consumers and reduces redundant polling.

Explanation

Correct Answer

D:

Event-driven delivery decouples producers from consumers and reduces redundant polling. This mechanism explains Event stream versus request-response polling. Action: Subscribe to the supported event channel and reconcile snapshots periodically for completeness. Expected confirmation: Incremental changes arrive without one full-inventory HTTP request per event.

Incorrect Answers

A:

Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks. This relates to Acknowledge webhook quickly and queue work. In the current Event stream versus request-response polling case the operative principle is: Event-driven delivery decouples producers from consumers and reduces redundant polling.

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 Event stream versus request-response polling case the operative principle is: Event-driven delivery decouples producers from consumers and reduces redundant polling.

C:

403 often indicates that the principal is known but lacks permission to perform the action. This relates to 403 Forbidden despite valid authentication. In the current Event stream versus request-response polling case the operative principle is: Event-driven delivery decouples producers from consumers and reduces redundant polling.

Question 259

A team does not apply the necessary control or correction. A monitoring service offers an event stream for thousands of interface changes, but a team repeatedly requests full inventory snapshots for each update. Which resulting failure or risk is most directly relevant?

  1. Blindly replaying the stale update can discard concurrent changes.
  2. High-frequency polling can exhaust quotas while still missing short-lived state changes.
  3. Blind JSON parsing can misclassify an intermediary login page as a broken API field.
  4. Granting administrator rights for a single denied method violates least privilege.

Explanation

Correct Answer

B:

High-frequency polling can exhaust quotas while still missing short-lived state changes. This is the direct exposure for Event stream versus request-response polling. Mitigate with: Subscribe to the supported event channel and reconcile snapshots periodically for completeness. Check success by: Incremental changes arrive without one full-inventory HTTP request per event.

Incorrect Answers

A:

Blindly replaying the stale update can discard concurrent changes. This risk occurs in the different 409 Conflict on stale configuration revision situation. For the given Event stream versus request-response polling requirement, the directly relevant risk is: High-frequency polling can exhaust quotas while still missing short-lived state changes.

C:

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 Event stream versus request-response polling requirement, the directly relevant risk is: High-frequency polling can exhaust quotas while still missing short-lived state changes.

D:

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 Event stream versus request-response polling requirement, the directly relevant risk is: High-frequency polling can exhaust quotas while still missing short-lived state changes.

Question 260

The initial implementation fails or does not meet the expected behavior. A monitoring service offers an event stream for thousands of interface changes, but a team repeatedly requests full inventory snapshots for each update. Which investigation should be prioritized to diagnose the problem?

  1. Inspect subscription state, delivery logs, target URL and received event timestamp.
  2. Inspect page size, continuation token transitions, collected IDs and terminating response.
  3. Compare HTTP verb, required JSON schema and response status with the API reference.
  4. Inspect subscription offsets, event ordering and periodic snapshot reconciliation.

Explanation

Correct Answer

D:

Inspect subscription offsets, event ordering and periodic snapshot reconciliation. These are the relevant initial evidence checks for Event stream versus request-response polling. Intended action: Subscribe to the supported event channel and reconcile snapshots periodically for completeness. Expected success condition: Incremental changes arrive without one full-inventory HTTP request per event.

Incorrect Answers

A:

Inspect subscription state, delivery logs, target URL and received event timestamp. This investigation primarily applies to Webhook push instead of polling, not the current Event stream versus request-response polling problem. Prioritize: Inspect subscription offsets, event ordering and periodic snapshot reconciliation.

B:

Inspect page size, continuation token transitions, collected IDs and terminating response. This investigation primarily applies to Traverse cursor-based pagination, not the current Event stream versus request-response polling problem. Prioritize: Inspect subscription offsets, event ordering and periodic snapshot reconciliation.

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 Event stream versus request-response polling problem. Prioritize: Inspect subscription offsets, event ordering and periodic snapshot reconciliation.

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

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