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DevNet Associate (DEVASC) 200-901 Practice Test 25

Question 240

The initial implementation fails or does not meet the expected behavior. A modern Meraki integration expects an API credential in the documented authentication header; a developer appends the token to URLs logged by proxies. Which investigation should be prioritized to diagnose the problem?

  1. Inspect prepared request URL, response status and simulated timeout handling.
  2. Inspect request headers, raw payload bytes and accepted media types in API docs.
  3. Compare HTTP verb, required JSON schema and response status with the API reference.
  4. Inspect URL construction, header placement and redacted request traces.

Explanation

Correct Answer

D:

Inspect URL construction, header placement and redacted request traces. These are the relevant initial evidence checks for Bearer token separation from query string. Intended action: Move the token into the authorized HTTP header and keep it out of query parameters and logs. Expected success condition: Network logs show no credential in the request URL and authenticated calls still succeed.

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 Bearer token separation from query string problem. Prioritize: Inspect URL construction, header placement and redacted request traces.

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 Bearer token separation from query string problem. Prioritize: Inspect URL construction, header placement and redacted request traces.

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 Bearer token separation from query string problem. Prioritize: Inspect URL construction, header placement and redacted request traces.

Question 241

A Cisco network automation team has this requirement: A code review finds a working controller API key accidentally committed in a public repository last month. Which design or implementation action best addresses it?

  1. Keep the cached representation on 304 and refresh it only when the server sends a new 200 response body.
  2. Send GET /devices with site=west as a URL query parameter and the required authorization header.
  3. Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.
  4. Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage.

Explanation

Correct Answer

D:

Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage. Technical reason: Revocation invalidates leaked bearer-equivalent credentials while secret storage reduces future exposure. Verify by: The old key fails authentication and the service succeeds with the replacement through a secret reference. Deployment qualification: Determine incident exposure and downstream impact before closing the remediation.

Incorrect Answers

A:

Keep the cached representation on 304 and refresh it only when the server sends a new 200 response body. This instead targets the different case Handle conditional GET with 304. The described Rotate a compromised API key requirement specifically calls for Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage.

B:

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 Rotate a compromised API key requirement specifically calls for Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage.

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 Rotate a compromised API key requirement specifically calls for Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage.

Question 242

After deployment, an engineer must prove the proposed solution works. A code review finds a working controller API key accidentally committed in a public repository last month. Which observed result is the most direct acceptance evidence?

  1. The service returns a newly created subscription identifier and a matching stored event filter.
  2. A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.
  3. The old key fails authentication and the service succeeds with the replacement through a secret reference.
  4. Incremental changes arrive without one full-inventory HTTP request per event.

Explanation

Correct Answer

C:

The old key fails authentication and the service succeeds with the replacement through a secret reference. Recommended implementation: Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage. Why the observation matters: Revocation invalidates leaked bearer-equivalent credentials while secret storage reduces future exposure.

Incorrect Answers

A:

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 Rotate a compromised API key case. For this case, the decisive observation is: The old key fails authentication and the service succeeds with the replacement through a secret reference.

B:

A deliberately unresponsive fixture causes a handled timeout within the defined processing budget. That observation could confirm Control timeouts and retry budget, not the current Rotate a compromised API key case. For this case, the decisive observation is: The old key fails authentication and the service succeeds with the replacement through a secret reference.

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 Rotate a compromised API key case. For this case, the decisive observation is: The old key fails authentication and the service succeeds with the replacement through a secret reference.

Question 243

A developer is explaining the underlying technical behavior. A code review finds a working controller API key accidentally committed in a public repository last month. Which principle is most relevant to this case?

  1. Event-driven delivery decouples producers from consumers and reduces redundant polling.
  2. Revocation invalidates leaked bearer-equivalent credentials while secret storage reduces future exposure.
  3. API versions and schema contracts determine available fields and response representations.
  4. Transport exceptions are distinct from normal HTTP response statuses.

Explanation

Correct Answer

B:

Revocation invalidates leaked bearer-equivalent credentials while secret storage reduces future exposure. This mechanism explains Rotate a compromised API key. Action: Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage. Expected confirmation: The old key fails authentication and the service succeeds with the replacement through a secret reference.

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 Rotate a compromised API key case the operative principle is: Revocation invalidates leaked bearer-equivalent credentials while secret storage reduces future exposure.

C:

API versions and schema contracts determine available fields and response representations. This relates to Respect versioned API fields. In the current Rotate a compromised API key case the operative principle is: Revocation invalidates leaked bearer-equivalent credentials while secret storage reduces future exposure.

D:

Transport exceptions are distinct from normal HTTP response statuses. This relates to Catch RequestException without hiding failures. In the current Rotate a compromised API key case the operative principle is: Revocation invalidates leaked bearer-equivalent credentials while secret storage reduces future exposure.

Question 244

A team does not apply the necessary control or correction. A code review finds a working controller API key accidentally committed in a public repository last month. Which resulting failure or risk is most directly relevant?

  1. Deleting the wrong ID could remove the production alarm pipeline.
  2. Blocking the HTTP callback can trigger retries and duplicate work execution.
  3. Discarding cached data on 304 creates empty reports despite no upstream change.
  4. Simply deleting the current file does not remove the credential from repository history or attacker copies.

Explanation

Correct Answer

D:

Simply deleting the current file does not remove the credential from repository history or attacker copies. This is the direct exposure for Rotate a compromised API key. Mitigate with: Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage. Check success by: The old key fails authentication and the service succeeds with the replacement through a secret reference.

Incorrect Answers

A:

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 Rotate a compromised API key requirement, the directly relevant risk is: Simply deleting the current file does not remove the credential from repository history or attacker copies.

B:

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 Rotate a compromised API key requirement, the directly relevant risk is: Simply deleting the current file does not remove the credential from repository history or attacker copies.

C:

Discarding cached data on 304 creates empty reports despite no upstream change. This risk occurs in the different Handle conditional GET with 304 situation. For the given Rotate a compromised API key requirement, the directly relevant risk is: Simply deleting the current file does not remove the credential from repository history or attacker copies.

Question 245

The initial implementation fails or does not meet the expected behavior. A code review finds a working controller API key accidentally committed in a public repository last month. Which investigation should be prioritized to diagnose the problem?

  1. Inspect key usage logs, issuance/revocation timestamps and secret-scanning findings.
  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

A:

Inspect key usage logs, issuance/revocation timestamps and secret-scanning findings. These are the relevant initial evidence checks for Rotate a compromised API key. Intended action: Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage. Expected success condition: The old key fails authentication and the service succeeds with the replacement through a secret reference.

Incorrect Answers

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 Rotate a compromised API key problem. Prioritize: Inspect key usage logs, issuance/revocation timestamps and secret-scanning findings.

C:

Inspect job-id fields, polling instructions and final-state payload shape. This investigation primarily applies to Synchronous request versus deferred job, not the current Rotate a compromised API key problem. Prioritize: Inspect key usage logs, issuance/revocation timestamps and secret-scanning findings.

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 Rotate a compromised API key problem. Prioritize: Inspect key usage logs, issuance/revocation timestamps and secret-scanning findings.

Question 246

A Cisco network automation team has this requirement: An operator needs to trigger a long-running inventory reconciliation, yet the API returns a job identifier immediately rather than the finished report. Which design or implementation action best addresses it?

  1. Use the asynchronous job workflow and obtain completion status before consuming result artifacts.
  2. Record the accepted job and poll or subscribe to its documented completion state before reporting success.
  3. Specify finite connect/read timeouts and an overall bounded retry budget around the request.
  4. Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS.

Explanation

Correct Answer

A:

Use the asynchronous job workflow and obtain completion status before consuming result artifacts. Technical reason: Asynchronous APIs separate submission acknowledgement from eventual work completion. Verify by: The client waits for a terminal successful state and then fetches the completed report URI. Deployment qualification: Poll intervals and job expiration must follow the service contract.

Incorrect Answers

B:

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 Synchronous request versus deferred job requirement specifically calls for Use the asynchronous job workflow and obtain completion status before consuming result artifacts.

C:

Specify finite connect/read timeouts and an overall bounded retry budget around the request. This instead targets the different case Control timeouts and retry budget. The described Synchronous request versus deferred job requirement specifically calls for Use the asynchronous job workflow and obtain completion status before consuming result artifacts.

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 Synchronous request versus deferred job requirement specifically calls for Use the asynchronous job workflow and obtain completion status before consuming result artifacts.

Question 247

After deployment, an engineer must prove the proposed solution works. An operator needs to trigger a long-running inventory reconciliation, yet the API returns a job identifier immediately rather than the finished report. Which observed result is the most direct acceptance evidence?

  1. The client waits for a terminal successful state and then fetches the completed report URI.
  2. After a simulated limit response, the client waits and succeeds without a tight retry storm.
  3. The server authenticates the lab account and the request does not expose credentials in logs.
  4. Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

Explanation

Correct Answer

A:

The client waits for a terminal successful state and then fetches the completed report URI. Recommended implementation: Use the asynchronous job workflow and obtain completion status before consuming result artifacts. Why the observation matters: Asynchronous APIs separate submission acknowledgement from eventual work completion.

Incorrect Answers

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 Synchronous request versus deferred job case. For this case, the decisive observation is: The client waits for a terminal successful state and then fetches the completed report URI.

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 Synchronous request versus deferred job case. For this case, the decisive observation is: The client waits for a terminal successful state and then fetches the completed report URI.

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 Synchronous request versus deferred job case. For this case, the decisive observation is: The client waits for a terminal successful state and then fetches the completed report URI.

Question 248

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

  1. Asynchronous APIs separate submission acknowledgement from eventual work completion.
  2. Transport exceptions are distinct from normal HTTP response statuses.
  3. Headers convey protocol metadata while the body carries a representation of application data.
  4. The response media type indicates how the body should be interpreted.

Explanation

Correct Answer

A:

Asynchronous APIs separate submission acknowledgement from eventual work completion. This mechanism explains Synchronous request versus deferred job. Action: Use the asynchronous job workflow and obtain completion status before consuming result artifacts. Expected confirmation: The client waits for a terminal successful state and then fetches the completed report URI.

Incorrect Answers

B:

Transport exceptions are distinct from normal HTTP response statuses. This relates to Catch RequestException without hiding failures. In the current Synchronous request versus deferred job case the operative principle is: Asynchronous APIs separate submission acknowledgement from eventual work completion.

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 Synchronous request versus deferred job case the operative principle is: Asynchronous APIs separate submission acknowledgement from eventual work completion.

D:

The response media type indicates how the body should be interpreted. This relates to Content-Type guards JSON parsing. In the current Synchronous request versus deferred job case the operative principle is: Asynchronous APIs separate submission acknowledgement from eventual work completion.

Question 249

A team does not apply the necessary control or correction. An operator needs to trigger a long-running inventory reconciliation, yet the API returns a job identifier immediately rather than the finished report. Which resulting failure or risk is most directly relevant?

  1. Broad except:pass logic can conceal genuine outages and report success.
  2. Discarding cached data on 304 creates empty reports despite no upstream change.
  3. Assuming every 200 or 202 returns final report data can publish incomplete results.
  4. Slow polling creates event-detection delay and unnecessary API load.

Explanation

Correct Answer

C:

Assuming every 200 or 202 returns final report data can publish incomplete results. This is the direct exposure for Synchronous request versus deferred job. Mitigate with: Use the asynchronous job workflow and obtain completion status before consuming result artifacts. Check success by: The client waits for a terminal successful state and then fetches the completed report URI.

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 Synchronous request versus deferred job requirement, the directly relevant risk is: Assuming every 200 or 202 returns final report data can publish incomplete results.

B:

Discarding cached data on 304 creates empty reports despite no upstream change. This risk occurs in the different Handle conditional GET with 304 situation. For the given Synchronous request versus deferred job requirement, the directly relevant risk is: Assuming every 200 or 202 returns final report data can publish incomplete results.

D:

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 Synchronous request versus deferred job requirement, the directly relevant risk is: Assuming every 200 or 202 returns final report data can publish incomplete results.

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.

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

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