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DevNet Associate (DEVASC) 200-901 Practice Test 28

Question 270

The initial implementation fails or does not meet the expected behavior. A client calls requests.post(url, data=str(python_dict)) and the receiver reports malformed JSON. Which investigation should be prioritized to diagnose the problem?

  1. Inspect response code, Location header and the newly created object's identifier.
  2. Inspect identity, role assignments, method-specific permissions and server authorization logs.
  3. Inspect connect/read timeout configuration, exception handling and total retry elapsed time.
  4. Inspect outbound bytes, Content-Type and the server's validation response.

Explanation

Correct Answer

D:

Inspect outbound bytes, Content-Type and the server's validation response. These are the relevant initial evidence checks for Use requests.post json parameter. Intended action: Supply a JSON-serializable mapping through requests.post(..., json=payload) with the required headers. Expected success condition: The captured request body is valid JSON and the server recognizes its expected media type.

Incorrect Answers

A:

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 Use requests.post json parameter problem. Prioritize: Inspect outbound bytes, Content-Type and the server's validation response.

B:

Inspect identity, role assignments, method-specific permissions and server authorization logs. This investigation primarily applies to 403 Forbidden despite valid authentication, not the current Use requests.post json parameter problem. Prioritize: Inspect outbound bytes, Content-Type and the server's validation response.

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 Use requests.post json parameter problem. Prioritize: Inspect outbound bytes, Content-Type and the server's validation response.

Question 271

A Cisco network automation team has this requirement: An automated health monitor crashes whenever DNS resolution or a TLS handshake fails, leaving no usable incident event. Which design or implementation action best addresses it?

  1. Validate the notification, enqueue a durable job and return the required 2xx acknowledgement promptly.
  2. Use the documented PATCH operation with the targeted description field and concurrency prerequisites.
  3. Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result.
  4. Validate the provider's documented shared-secret signature over the received request body before processing the event.

Explanation

Correct Answer

C:

Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result. Technical reason: Transport exceptions are distinct from normal HTTP response statuses. Verify by: DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks. Deployment qualification: Never treat a failed request as proof the remote mutation did not occur.

Incorrect Answers

A:

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 Catch RequestException without hiding failures requirement specifically calls for Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result.

B:

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 Catch RequestException without hiding failures requirement specifically calls for Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result.

D:

Validate the provider's documented shared-secret signature over the received request body before processing the event. This instead targets the different case Verify webhook signature on callback. The described Catch RequestException without hiding failures requirement specifically calls for Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result.

Question 272

After deployment, an engineer must prove the proposed solution works. An automated health monitor crashes whenever DNS resolution or a TLS handshake fails, leaving no usable incident event. Which observed result is the most direct acceptance evidence?

  1. DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.
  2. One event produces one queued job and the provider stops retrying after successful acknowledgement.
  3. After a simulated limit response, the client waits and succeeds without a tight retry storm.
  4. After a 304, the client still serves the previously cached valid inventory response.

Explanation

Correct Answer

A:

DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks. Recommended implementation: Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result. Why the observation matters: Transport exceptions are distinct from normal HTTP response statuses.

Incorrect Answers

B:

One event produces one queued job and the provider stops retrying after successful acknowledgement. That observation could confirm Acknowledge webhook quickly and queue work, not the current Catch RequestException without hiding failures case. For this case, the decisive observation is: DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.

C:

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 Catch RequestException without hiding failures case. For this case, the decisive observation is: DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.

D:

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 Catch RequestException without hiding failures case. For this case, the decisive observation is: DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.

Question 273

A developer is explaining the underlying technical behavior. An automated health monitor crashes whenever DNS resolution or a TLS handshake fails, leaving no usable incident event. Which principle is most relevant to this case?

  1. HTTP Link headers can advertise pagination relations independently of the response body.
  2. Transport exceptions are distinct from normal HTTP response statuses.
  3. Rate limiting constrains request frequency and 429 indicates throttling rather than a malformed endpoint.
  4. 401 indicates missing or invalid authentication credentials for the requested resource.

Explanation

Correct Answer

B:

Transport exceptions are distinct from normal HTTP response statuses. This mechanism explains Catch RequestException without hiding failures. Action: Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result. Expected confirmation: DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.

Incorrect Answers

A:

HTTP Link headers can advertise pagination relations independently of the response body. This relates to Parse Link header for next page. In the current Catch RequestException without hiding failures case the operative principle is: Transport exceptions are distinct from normal HTTP response statuses.

C:

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 Catch RequestException without hiding failures case the operative principle is: Transport exceptions are distinct from normal HTTP response statuses.

D:

401 indicates missing or invalid authentication credentials for the requested resource. This relates to 401 Unauthorized on expired bearer token. In the current Catch RequestException without hiding failures case the operative principle is: Transport exceptions are distinct from normal HTTP response statuses.

Question 274

A team does not apply the necessary control or correction. An automated health monitor crashes whenever DNS resolution or a TLS handshake fails, leaving no usable incident event. Which resulting failure or risk is most directly relevant?

  1. A 200-only success check can spuriously retry and create duplicate objects.
  2. Broad except:pass logic can conceal genuine outages and report success.
  3. Ignoring the cursor silently undercounts hosts and produces incomplete security inventory.
  4. Deleting the wrong ID could remove the production alarm pipeline.

Explanation

Correct Answer

B:

Broad except:pass logic can conceal genuine outages and report success. This is the direct exposure for Catch RequestException without hiding failures. Mitigate with: Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result. Check success by: DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.

Incorrect Answers

A:

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

C:

Ignoring the cursor silently undercounts hosts and produces incomplete security inventory. This risk occurs in the different Traverse cursor-based pagination situation. For the given Catch RequestException without hiding failures requirement, the directly relevant risk is: Broad except:pass logic can conceal genuine outages and report success.

D:

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 Catch RequestException without hiding failures requirement, the directly relevant risk is: Broad except:pass logic can conceal genuine outages and report success.

Question 275

The initial implementation fails or does not meet the expected behavior. An automated health monitor crashes whenever DNS resolution or a TLS handshake fails, leaving no usable incident event. Which investigation should be prioritized to diagnose the problem?

  1. Inspect connect/read timeout configuration, exception handling and total retry elapsed time.
  2. Inspect exception type, logger output and health-check return path under injected faults.
  3. Inspect Link header rel values, next URL and visited-page count.
  4. Compare HTTP verb, required JSON schema and response status with the API reference.

Explanation

Correct Answer

B:

Inspect exception type, logger output and health-check return path under injected faults. These are the relevant initial evidence checks for Catch RequestException without hiding failures. Intended action: Catch appropriate requests exceptions, log a redacted structured failure and return an explicit unsuccessful result. Expected success condition: DNS, connection and TLS test failures produce classified alerts rather than falsely successful checks.

Incorrect Answers

A:

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 Catch RequestException without hiding failures problem. Prioritize: Inspect exception type, logger output and health-check return path under injected faults.

C:

Inspect Link header rel values, next URL and visited-page count. This investigation primarily applies to Parse Link header for next page, not the current Catch RequestException without hiding failures problem. Prioritize: Inspect exception type, logger output and health-check return path under injected faults.

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 Catch RequestException without hiding failures problem. Prioritize: Inspect exception type, logger output and health-check return path under injected faults.

Question 276

A Cisco network automation team has this requirement: A polling integration opens a new TLS connection for every small request and a developer proposes verify=False to improve apparent reliability. Which design or implementation action best addresses it?

  1. Specify finite connect/read timeouts and an overall bounded retry budget around the request.
  2. Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification.
  3. Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage.
  4. Check role/permission authorization for the operation instead of rotating valid credentials blindly.

Explanation

Correct Answer

B:

Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification. Technical reason: Sessions pool HTTP connections and certificate verification authenticates the remote endpoint. Verify by: Repeated calls reuse eligible connections while an untrusted certificate is still rejected. Deployment qualification: Connection pooling is an optimization; the server may still close or rotate connections.

Incorrect Answers

A:

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 Reuse requests Session with certificate verification requirement specifically calls for Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification.

C:

Revoke the exposed key, issue a new least-privilege key and move it to approved secret storage. This instead targets the different case Rotate a compromised API key. The described Reuse requests Session with certificate verification requirement specifically calls for Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification.

D:

Check role/permission authorization for the operation instead of rotating valid credentials blindly. This instead targets the different case 403 Forbidden despite valid authentication. The described Reuse requests Session with certificate verification requirement specifically calls for Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification.

Question 277

After deployment, an engineer must prove the proposed solution works. A polling integration opens a new TLS connection for every small request and a developer proposes verify=False to improve apparent reliability. Which observed result is the most direct acceptance evidence?

  1. Repeated calls reuse eligible connections while an untrusted certificate is still rejected.
  2. The authenticated retry succeeds while invalid credentials are rejected consistently.
  3. The same semantic request is accepted with the proper media type and valid field values.
  4. A reboot task appears in the controller's operations history for the chosen device.

Explanation

Correct Answer

A:

Repeated calls reuse eligible connections while an untrusted certificate is still rejected. Recommended implementation: Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification. Why the observation matters: Sessions pool HTTP connections and certificate verification authenticates the remote endpoint.

Incorrect Answers

B:

The authenticated retry succeeds while invalid credentials are rejected consistently. That observation could confirm 401 Unauthorized on expired bearer token, not the current Reuse requests Session with certificate verification case. For this case, the decisive observation is: Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

C:

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 Reuse requests Session with certificate verification case. For this case, the decisive observation is: Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

D:

A reboot task appears in the controller's operations history for the chosen device. That observation could confirm RPC action versus REST resource semantics, not the current Reuse requests Session with certificate verification case. For this case, the decisive observation is: Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

Question 278

A developer is explaining the underlying technical behavior. A polling integration opens a new TLS connection for every small request and a developer proposes verify=False to improve apparent reliability. Which principle is most relevant to this case?

  1. HTTP Link headers can advertise pagination relations independently of the response body.
  2. Sessions pool HTTP connections and certificate verification authenticates the remote endpoint.
  3. Headers convey protocol metadata while the body carries a representation of application data.
  4. 204 No Content deliberately indicates success without a response payload.

Explanation

Correct Answer

B:

Sessions pool HTTP connections and certificate verification authenticates the remote endpoint. This mechanism explains Reuse requests Session with certificate verification. Action: Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification. Expected confirmation: Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

Incorrect Answers

A:

HTTP Link headers can advertise pagination relations independently of the response body. This relates to Parse Link header for next page. In the current Reuse requests Session with certificate verification case the operative principle is: Sessions pool HTTP connections and certificate verification authenticates the remote endpoint.

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 Reuse requests Session with certificate verification case the operative principle is: Sessions pool HTTP connections and certificate verification authenticates the remote endpoint.

D:

204 No Content deliberately indicates success without a response payload. This relates to Interpret 204 No Content. In the current Reuse requests Session with certificate verification case the operative principle is: Sessions pool HTTP connections and certificate verification authenticates the remote endpoint.

Question 279

A team does not apply the necessary control or correction. A polling integration opens a new TLS connection for every small request and a developer proposes verify=False to improve apparent reliability. Which resulting failure or risk is most directly relevant?

  1. Disabling TLS verification permits interception or spoofed-controller responses.
  2. Unauthenticated callbacks permit forged incidents or unauthorized bot operations.
  3. Deleting the wrong ID could remove the production alarm pipeline.
  4. Aggressive retries amplify throttling and may lead to temporary API blocks.

Explanation

Correct Answer

A:

Disabling TLS verification permits interception or spoofed-controller responses. This is the direct exposure for Reuse requests Session with certificate verification. Mitigate with: Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification. Check success by: Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

Incorrect Answers

B:

Unauthenticated callbacks permit forged incidents or unauthorized bot operations. This risk occurs in the different Verify webhook signature on callback situation. For the given Reuse requests Session with certificate verification requirement, the directly relevant risk is: Disabling TLS verification permits interception or spoofed-controller responses.

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 Reuse requests Session with certificate verification requirement, the directly relevant risk is: Disabling TLS verification permits interception or spoofed-controller responses.

D:

Aggressive retries amplify throttling and may lead to temporary API blocks. This risk occurs in the different Back off on API rate-limit response situation. For the given Reuse requests Session with certificate verification requirement, the directly relevant risk is: Disabling TLS verification permits interception or spoofed-controller responses.

Question 280

The initial implementation fails or does not meet the expected behavior. A polling integration opens a new TLS connection for every small request and a developer proposes verify=False to improve apparent reliability. Which investigation should be prioritized to diagnose the problem?

  1. Inspect the endpoint's parameter location and the actual URL captured in request logs.
  2. Inspect session adapter behavior, certificate trust and request timing with a test endpoint.
  3. Inspect raw response status line, headers and JSON payload separately.
  4. Inspect revision/ETag tokens, competing updates and the diff between desired and current state.

Explanation

Correct Answer

B:

Inspect session adapter behavior, certificate trust and request timing with a test endpoint. These are the relevant initial evidence checks for Reuse requests Session with certificate verification. Intended action: Reuse a requests.Session with trusted certificate validation and bounded timeouts rather than disabling TLS verification. Expected success condition: Repeated calls reuse eligible connections while an untrusted certificate is still rejected.

Incorrect Answers

A:

Inspect the endpoint's parameter location and the actual URL captured in request logs. This investigation primarily applies to GET filtered devices using query parameters, not the current Reuse requests Session with certificate verification problem. Prioritize: Inspect session adapter behavior, certificate trust and request timing with a test endpoint.

C:

Inspect raw response status line, headers and JSON payload separately. This investigation primarily applies to Distinguish HTTP headers from response body, not the current Reuse requests Session with certificate verification problem. Prioritize: Inspect session adapter behavior, certificate trust and request timing with a test endpoint.

D:

Inspect revision/ETag tokens, competing updates and the diff between desired and current state. This investigation primarily applies to 409 Conflict on stale configuration revision, not the current Reuse requests Session with certificate verification problem. Prioritize: Inspect session adapter behavior, certificate trust and request timing with a test endpoint.

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

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