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DevNet Associate (DEVASC) 200-901 Practice Test 16

Question 150

The initial implementation fails or does not meet the expected behavior. A collaboration bot accepts arbitrary HTTPS posts as trusted Webex event notices without verifying their origin. Which investigation should be prioritized to diagnose the problem?

  1. Inspect raw payload bytes, signature header and constant-time digest comparison outcome.
  2. Inspect request headers, raw payload bytes and accepted media types in API docs.
  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

A:

Inspect raw payload bytes, signature header and constant-time digest comparison outcome. These are the relevant initial evidence checks for Verify webhook signature on callback. Intended action: Validate the provider's documented shared-secret signature over the received request body before processing the event. Expected success condition: A correctly signed fixture is accepted and a tampered body or invalid signature is rejected.

Incorrect Answers

B:

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 Verify webhook signature on callback problem. Prioritize: Inspect raw payload bytes, signature header and constant-time digest comparison outcome.

C:

Inspect connect/read timeout configuration, exception handling and total retry elapsed time. This investigation primarily applies to Control timeouts and retry budget, not the current Verify webhook signature on callback problem. Prioritize: Inspect raw payload bytes, signature header and constant-time digest comparison outcome.

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 Verify webhook signature on callback problem. Prioritize: Inspect raw payload bytes, signature header and constant-time digest comparison outcome.

Question 151

A Cisco network automation team has this requirement: A webhook handler performs a ten-minute backup synchronously; the sender retries when it sees an HTTP timeout. Which design or implementation action best addresses it?

  1. Send GET /devices with site=west as a URL query parameter and the required authorization header.
  2. Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly.
  3. Use the documented PATCH operation with the targeted description field and concurrency prerequisites.
  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

B:

Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly. Technical reason: Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks. Verify by: One event produces one queued job and the provider stops retrying after successful acknowledgement. Deployment qualification: The queue and consumer must implement retry and idempotent processing after acknowledgement.

Incorrect Answers

A:

Send GET /devices with site=west as a URL query parameter and the required authorization header. This instead targets the different case GET filtered devices using query parameters. The described Acknowledge webhook quickly and queue work requirement specifically calls for Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly.

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 Acknowledge webhook quickly and queue work requirement specifically calls for Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly.

D:

Select the documented RPC or action call for reboot rather than trying to update an unrelated GET resource with an invented field. This instead targets the different case RPC action versus REST resource semantics (A management SDK exposes rebootDevice(deviceId) as an action while a REST inventory API exposes /devices/{id} as a resource.). The described Acknowledge webhook quickly and queue work requirement specifically calls for Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly.

Question 152

After deployment, an engineer must prove the proposed solution works. A webhook handler performs a ten-minute backup synchronously; the sender retries when it sees an HTTP timeout. 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. The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone.
  3. One event produces one queued job and the provider stops retrying after successful acknowledgement.
  4. A simulated text/html response is rejected as unexpected content without misleading key errors.

Explanation

Correct Answer

C:

One event produces one queued job and the provider stops retrying after successful acknowledgement. Recommended implementation: Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly. Why the observation matters: Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks.

Incorrect Answers

A:

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

B:

The deletion routine completes without JSONDecodeError and a later GET confirms the record is gone. That observation could confirm Interpret 204 No Content, not the current Acknowledge webhook quickly and queue work case. For this case, the decisive observation is: One event produces one queued job and the provider stops retrying after successful acknowledgement.

D:

A simulated text/html response is rejected as unexpected content without misleading key errors. That observation could confirm Content-Type guards JSON parsing, not the current Acknowledge webhook quickly and queue work case. For this case, the decisive observation is: One event produces one queued job and the provider stops retrying after successful acknowledgement.

Question 153

A developer is explaining the underlying technical behavior. A webhook handler performs a ten-minute backup synchronously; the sender retries when it sees an HTTP timeout. Which principle is most relevant to this case?

  1. Event-driven delivery decouples producers from consumers and reduces redundant polling.
  2. 204 No Content deliberately indicates success without a response payload.
  3. 401 indicates missing or invalid authentication credentials for the requested resource.
  4. Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks.

Explanation

Correct Answer

D:

Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks. This mechanism explains Acknowledge webhook quickly and queue work. Action: Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly. Expected confirmation: One event produces one queued job and the provider stops retrying after successful acknowledgement.

Incorrect Answers

A:

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

B:

204 No Content deliberately indicates success without a response payload. This relates to Interpret 204 No Content. In the current Acknowledge webhook quickly and queue work case the operative principle is: Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks.

C:

401 indicates missing or invalid authentication credentials for the requested resource. This relates to 401 Unauthorized on expired bearer token. In the current Acknowledge webhook quickly and queue work case the operative principle is: Asynchronous processing decouples fast event delivery acknowledgement from slow business tasks.

Question 154

A team does not apply the necessary control or correction. A webhook handler performs a ten-minute backup synchronously; the sender retries when it sees an HTTP timeout. Which resulting failure or risk is most directly relevant?

  1. Searching for headers inside the body can hide rate limits and trigger unnecessary requests.
  2. Blocking the HTTP callback can trigger retries and duplicate work execution.
  3. Deleting the wrong ID could remove the production alarm pipeline.
  4. Changing device routes will not resolve an expired access token.

Explanation

Correct Answer

B:

Blocking the HTTP callback can trigger retries and duplicate work execution. This is the direct exposure for Acknowledge webhook quickly and queue work. Mitigate with: Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly. Check success by: One event produces one queued job and the provider stops retrying after successful acknowledgement.

Incorrect Answers

A:

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 Acknowledge webhook quickly and queue work requirement, the directly relevant risk is: Blocking the HTTP callback can trigger retries and duplicate work execution.

C:

Deleting the wrong ID could remove the production alarm pipeline. This risk occurs in the different DELETE an obsolete webhook subscription situation. For the given Acknowledge webhook quickly and queue work requirement, the directly relevant risk is: Blocking the HTTP callback can trigger retries and duplicate work execution.

D:

Changing device routes will not resolve an expired access token. This risk occurs in the different 401 Unauthorized on expired bearer token situation. For the given Acknowledge webhook quickly and queue work requirement, the directly relevant risk is: Blocking the HTTP callback can trigger retries and duplicate work execution.

Question 155

The initial implementation fails or does not meet the expected behavior. A webhook handler performs a ten-minute backup synchronously; the sender retries when it sees an HTTP timeout. Which investigation should be prioritized to diagnose the problem?

  1. Inspect response headers, request intervals and maximum attempt count.
  2. Inspect webhook response latency, delivery attempt history and job deduplication IDs.
  3. Inspect headers, first response bytes and any proxy or captive-portal redirects.
  4. Verify the identifier, endpoint authorization and returned deletion status before retrying.

Explanation

Correct Answer

B:

Inspect webhook response latency, delivery attempt history and job deduplication IDs. These are the relevant initial evidence checks for Acknowledge webhook quickly and queue work. Intended action: Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly. Expected success condition: One event produces one queued job and the provider stops retrying after successful acknowledgement.

Incorrect Answers

A:

Inspect response headers, request intervals and maximum attempt count. This investigation primarily applies to Back off on API rate-limit response, not the current Acknowledge webhook quickly and queue work problem. Prioritize: Inspect webhook response latency, delivery attempt history and job deduplication IDs.

C:

Inspect headers, first response bytes and any proxy or captive-portal redirects. This investigation primarily applies to Content-Type guards JSON parsing, not the current Acknowledge webhook quickly and queue work problem. Prioritize: Inspect webhook response latency, delivery attempt history and job deduplication IDs.

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 Acknowledge webhook quickly and queue work problem. Prioritize: Inspect webhook response latency, delivery attempt history and job deduplication IDs.

Question 156

A Cisco network automation team has this requirement: An inventory loop gets HTTP 429 and immediately repeats the same request hundreds of times per second. 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. Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification.
  3. Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate.
  4. Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS.

Explanation

Correct Answer

C:

Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate. Technical reason: Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint. Verify by: After a simulated limit response, the client waits and succeeds without a tight retry storm. Deployment qualification: Only safe or idempotent operations should be retried automatically without special safeguards.

Incorrect Answers

A:

Record the accepted job and poll or subscribe to its documented completion state before reporting success. This instead targets the different case Interpret 202 Accepted as asynchronous work. The described Back off on API rate-limit response requirement specifically calls for Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate.

B:

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 Back off on API rate-limit response requirement specifically calls for Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate.

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 Back off on API rate-limit response requirement specifically calls for Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate.

Question 157

After deployment, an engineer must prove the proposed solution works. An inventory loop gets HTTP 429 and immediately repeats the same request hundreds of times per second. Which observed result is the most direct acceptance evidence?

  1. After a 304, the client still serves the previously cached valid inventory response.
  2. The service returns a newly created subscription identifier and a matching stored event filter.
  3. After a simulated limit response, the client waits and succeeds without a tight retry storm.
  4. Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

Explanation

Correct Answer

C:

After a simulated limit response, the client waits and succeeds without a tight retry storm. Recommended implementation: Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate. Why the observation matters: Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.

Incorrect Answers

A:

After a 304, the client still serves the previously cached valid inventory response. That observation could confirm Handle conditional GET with 304, not the current Back off on API rate-limit response case. For this case, the decisive observation is: After a simulated limit response, the client waits and succeeds without a tight retry storm.

B:

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 Back off on API rate-limit response case. For this case, the decisive observation is: After a simulated limit response, the client waits and succeeds without a tight retry storm.

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 Back off on API rate-limit response case. For this case, the decisive observation is: After a simulated limit response, the client waits and succeeds without a tight retry storm.

Question 158

A developer is explaining the underlying technical behavior. An inventory loop gets HTTP 429 and immediately repeats the same request hundreds of times per second. Which principle is most relevant to this case?

  1. Webhooks push event notifications to a subscriber endpoint rather than requiring repeated polling.
  2. Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.
  3. Webhook signatures provide message integrity and origin evidence using a secret-derived digest.
  4. Asynchronous APIs separate submission acknowledgement from eventual work completion.

Explanation

Correct Answer

B:

Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint. This mechanism explains Back off on API rate-limit response. Action: Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate. Expected confirmation: After a simulated limit response, the client waits and succeeds without a tight retry storm.

Incorrect Answers

A:

Webhooks push event notifications to a subscriber endpoint rather than requiring repeated polling. This relates to Webhook push instead of polling. In the current Back off on API rate-limit response case the operative principle is: Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.

C:

Webhook signatures provide message integrity and origin evidence using a secret-derived digest. This relates to Verify webhook signature on callback. In the current Back off on API rate-limit response case the operative principle is: Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.

D:

Asynchronous APIs separate submission acknowledgement from eventual work completion. This relates to Synchronous request versus deferred job. In the current Back off on API rate-limit response case the operative principle is: Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.

Question 159

A team does not apply the necessary control or correction. An inventory loop gets HTTP 429 and immediately repeats the same request hundreds of times per second. Which resulting failure or risk is most directly relevant?

  1. Slow polling creates event-detection delay and unnecessary API load.
  2. Searching for headers inside the body can hide rate limits and trigger unnecessary requests.
  3. Aggressive retries amplify throttling and may lead to temporary API blocks.
  4. Treating acceptance as completion can schedule dependent changes during an in-progress upgrade.

Explanation

Correct Answer

C:

Aggressive retries amplify throttling and may lead to temporary API blocks. This is the direct exposure for Back off on API rate-limit response. Mitigate with: Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate. Check success by: After a simulated limit response, the client waits and succeeds without a tight retry storm.

Incorrect Answers

A:

Slow polling creates event-detection delay and unnecessary API load. This risk occurs in the different Webhook push instead of polling situation. For the given Back off on API rate-limit response requirement, the directly relevant risk is: Aggressive retries amplify throttling and may lead to temporary API blocks.

B:

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 Back off on API rate-limit response requirement, the directly relevant risk is: Aggressive retries amplify throttling and may lead to temporary API blocks.

D:

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 Back off on API rate-limit response requirement, the directly relevant risk is: Aggressive retries amplify throttling and may lead to temporary API blocks.

Question 160

The initial implementation fails or does not meet the expected behavior. An inventory loop gets HTTP 429 and immediately repeats the same request hundreds of times per second. Which investigation should be prioritized to diagnose the problem?

  1. Inspect raw response status line, headers and JSON payload separately.
  2. Inspect response headers, request intervals and maximum attempt count.
  3. Inspect response code, Location header and the newly created object's identifier.
  4. Verify the identifier, endpoint authorization and returned deletion status before retrying.

Explanation

Correct Answer

B:

Inspect response headers, request intervals and maximum attempt count. These are the relevant initial evidence checks for Back off on API rate-limit response. Intended action: Honor Retry-After or documented rate windows, applying bounded exponential backoff and jitter where appropriate. Expected success condition: After a simulated limit response, the client waits and succeeds without a tight retry storm.

Incorrect Answers

A:

Inspect raw response status line, headers and JSON payload separately. This investigation primarily applies to Distinguish HTTP headers from response body, not the current Back off on API rate-limit response problem. Prioritize: Inspect response headers, request intervals and maximum attempt count.

C:

Inspect response code, Location header and the newly created object's identifier. This investigation primarily applies to Interpret 201 Created on POST, not the current Back off on API rate-limit response problem. Prioritize: Inspect response headers, request intervals and maximum attempt count.

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 Back off on API rate-limit response problem. Prioritize: Inspect response headers, request intervals and maximum attempt count.

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

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