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DevNet Associate (DEVASC) 200-901 Practice Test 14

Question 130

The initial implementation fails or does not meet the expected behavior. An alert API documents POST /subscriptions with JSON fields endpoint and eventTypes, but the client issues GET and expects a new subscription. Which investigation should be prioritized to diagnose the problem?

  1. Inspect raw response status line, headers and JSON payload separately.
  2. Compare HTTP verb, required JSON schema and response status with the API reference.
  3. Inspect page size, continuation token transitions, collected IDs and terminating response.
  4. Inspect exception type, logger output and health-check return path under injected faults.

Explanation

Correct Answer

B:

Compare HTTP verb, required JSON schema and response status with the API reference. These are the relevant initial evidence checks for POST creates an alarm subscription. Intended action: Construct the documented POST with JSON body, Content-Type and authentication, then inspect the creation response. Expected success condition: The service returns a newly created subscription identifier and a matching stored event filter.

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 POST creates an alarm subscription problem. Prioritize: Compare HTTP verb, required JSON schema and response status with the API reference.

C:

Inspect page size, continuation token transitions, collected IDs and terminating response. This investigation primarily applies to Traverse cursor-based pagination, not the current POST creates an alarm subscription problem. Prioritize: Compare HTTP verb, required JSON schema and response status with the API reference.

D:

Inspect exception type, logger output and health-check return path under injected faults. This investigation primarily applies to Catch RequestException without hiding failures, not the current POST creates an alarm subscription problem. Prioritize: Compare HTTP verb, required JSON schema and response status with the API reference.

Question 131

A Cisco network automation team has this requirement: An interface API supports PATCH /interfaces/42 to update description only; an operator plans to PUT a partial object that omits the existing VLAN settings. Which design or implementation action best addresses it?

  1. Use the documented PATCH operation with the targeted description field and concurrency prerequisites.
  2. Pin the supported API version and adapt parsing to the documented versioned schema with explicit validation.
  3. Serialize the payload as valid JSON and set the required application/json Content-Type header.
  4. Send the required Basic authorization credentials through the HTTP client's supported auth interface over verified HTTPS.

Explanation

Correct Answer

A:

Use the documented PATCH operation with the targeted description field and concurrency prerequisites. Technical reason: PATCH expresses a partial modification while PUT generally replaces the addressed resource representation. Verify by: The description changes while the interface's existing VLAN configuration remains intact. Deployment qualification: Some APIs implement PATCH with custom semantics, so the schema remains authoritative.

Incorrect Answers

B:

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 PATCH a single interface description requirement specifically calls for Use the documented PATCH operation with the targeted description field and concurrency prerequisites.

C:

Serialize the payload as valid JSON and set the required application/json Content-Type header. This instead targets the different case 415 Unsupported Media Type on JSON endpoint. The described PATCH a single interface description requirement specifically calls for Use the documented PATCH operation with the targeted description field and concurrency prerequisites.

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 PATCH a single interface description requirement specifically calls for Use the documented PATCH operation with the targeted description field and concurrency prerequisites.

Question 132

After deployment, an engineer must prove the proposed solution works. An interface API supports PATCH /interfaces/42 to update description only; an operator plans to PUT a partial object that omits the existing VLAN settings. Which observed result is the most direct acceptance evidence?

  1. A role granted the documented delete privilege succeeds, while the read-only role remains forbidden.
  2. A deliberately unresponsive fixture causes a handled timeout within the defined processing budget.
  3. The description changes while the interface's existing VLAN configuration remains intact.
  4. A correctly signed fixture is accepted and a tampered body or invalid signature is rejected.

Explanation

Correct Answer

C:

The description changes while the interface's existing VLAN configuration remains intact. Recommended implementation: Use the documented PATCH operation with the targeted description field and concurrency prerequisites. Why the observation matters: PATCH expresses a partial modification while PUT generally replaces the addressed resource representation.

Incorrect Answers

A:

A role granted the documented delete privilege succeeds, while the read-only role remains forbidden. That observation could confirm 403 Forbidden despite valid authentication, not the current PATCH a single interface description case. For this case, the decisive observation is: The description changes while the interface's existing VLAN configuration remains intact.

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 PATCH a single interface description case. For this case, the decisive observation is: The description changes while the interface's existing VLAN configuration remains intact.

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 PATCH a single interface description case. For this case, the decisive observation is: The description changes while the interface's existing VLAN configuration remains intact.

Question 133

A developer is explaining the underlying technical behavior. An interface API supports PATCH /interfaces/42 to update description only; an operator plans to PUT a partial object that omits the existing VLAN settings. Which principle is most relevant to this case?

  1. Headers convey protocol metadata while the body carries a representation of application data.
  2. 202 Accepted means a request was accepted for processing, not necessarily finished.
  3. PATCH expresses a partial modification while PUT generally replaces the addressed resource representation.
  4. Asynchronous APIs separate submission acknowledgement from eventual work completion.

Explanation

Correct Answer

C:

PATCH expresses a partial modification while PUT generally replaces the addressed resource representation. This mechanism explains PATCH a single interface description. Action: Use the documented PATCH operation with the targeted description field and concurrency prerequisites. Expected confirmation: The description changes while the interface's existing VLAN configuration remains intact.

Incorrect Answers

A:

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 PATCH a single interface description case the operative principle is: PATCH expresses a partial modification while PUT generally replaces the addressed resource representation.

B:

202 Accepted means a request was accepted for processing, not necessarily finished. This relates to Interpret 202 Accepted as asynchronous work. In the current PATCH a single interface description case the operative principle is: PATCH expresses a partial modification while PUT generally replaces the addressed resource representation.

D:

Asynchronous APIs separate submission acknowledgement from eventual work completion. This relates to Synchronous request versus deferred job. In the current PATCH a single interface description case the operative principle is: PATCH expresses a partial modification while PUT generally replaces the addressed resource representation.

Question 134

A team does not apply the necessary control or correction. An interface API supports PATCH /interfaces/42 to update description only; an operator plans to PUT a partial object that omits the existing VLAN settings. Which resulting failure or risk is most directly relevant?

  1. Blind JSON parsing on an empty success response creates a false error condition.
  2. Replacing the authentication token will not repair an incompatible request media type.
  3. Slow polling creates event-detection delay and unnecessary API load.
  4. A partial PUT may overwrite or reset omitted settings depending on the service contract.

Explanation

Correct Answer

D:

A partial PUT may overwrite or reset omitted settings depending on the service contract. This is the direct exposure for PATCH a single interface description. Mitigate with: Use the documented PATCH operation with the targeted description field and concurrency prerequisites. Check success by: The description changes while the interface's existing VLAN configuration remains intact.

Incorrect Answers

A:

Blind JSON parsing on an empty success response creates a false error condition. This risk occurs in the different Interpret 204 No Content situation. For the given PATCH a single interface description requirement, the directly relevant risk is: A partial PUT may overwrite or reset omitted settings depending on the service contract.

B:

Replacing the authentication token will not repair an incompatible request media type. This risk occurs in the different 415 Unsupported Media Type on JSON endpoint situation. For the given PATCH a single interface description requirement, the directly relevant risk is: A partial PUT may overwrite or reset omitted settings depending on the service contract.

C:

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 PATCH a single interface description requirement, the directly relevant risk is: A partial PUT may overwrite or reset omitted settings depending on the service contract.

Question 135

The initial implementation fails or does not meet the expected behavior. An interface API supports PATCH /interfaces/42 to update description only; an operator plans to PUT a partial object that omits the existing VLAN settings. Which investigation should be prioritized to diagnose the problem?

  1. Inspect the API method definition, transmitted fields and before/after interface representation.
  2. Inspect SDK method signature, operation result and device identifier semantics.
  3. Inspect subscription offsets, event ordering and periodic snapshot reconciliation.
  4. Inspect session adapter behavior, certificate trust and request timing with a test endpoint.

Explanation

Correct Answer

A:

Inspect the API method definition, transmitted fields and before/after interface representation. These are the relevant initial evidence checks for PATCH a single interface description. Intended action: Use the documented PATCH operation with the targeted description field and concurrency prerequisites. Expected success condition: The description changes while the interface's existing VLAN configuration remains intact.

Incorrect Answers

B:

Inspect SDK method signature, operation result and device identifier semantics. This investigation primarily applies to RPC action versus REST resource semantics, not the current PATCH a single interface description problem. Prioritize: Inspect the API method definition, transmitted fields and before/after interface representation.

C:

Inspect subscription offsets, event ordering and periodic snapshot reconciliation. This investigation primarily applies to Event stream versus request-response polling, not the current PATCH a single interface description problem. Prioritize: Inspect the API method definition, transmitted fields and before/after interface representation.

D:

Inspect session adapter behavior, certificate trust and request timing with a test endpoint. This investigation primarily applies to Reuse requests Session with certificate verification, not the current PATCH a single interface description problem. Prioritize: Inspect the API method definition, transmitted fields and before/after interface representation.

Question 136

A Cisco network automation team has this requirement: A test integration left duplicate subscriptions sending the same incident twice; the API supports DELETE /subscriptions/{id}. Which design or implementation action best addresses it?

  1. Fetch current state, reconcile intended changes and resubmit using documented concurrency controls.
  2. Treat 201 Created as successful resource creation and record the new resource URI.
  3. Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method.
  4. Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected.

Explanation

Correct Answer

C:

Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method. Technical reason: DELETE targets removal of an identified resource rather than editing a collection through GET. Verify by: The unwanted subscription no longer appears on list requests and duplicate events cease. Deployment qualification: A successful DELETE may respond 204 No Content rather than JSON.

Incorrect Answers

A:

Fetch current state, reconcile intended changes and resubmit using documented concurrency controls. This instead targets the different case 409 Conflict on stale configuration revision. The described DELETE an obsolete webhook subscription requirement specifically calls for Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method.

B:

Treat 201 Created as successful resource creation and record the new resource URI. This instead targets the different case Interpret 201 Created on POST. The described DELETE an obsolete webhook subscription requirement specifically calls for Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method.

D:

Handle 204 as successful empty-content completion and avoid JSON decoding when no body is expected. This instead targets the different case Interpret 204 No Content (An API deletes a test client and returns HTTP 204; a Python caller immediately invokes response.json() and crashes on the empty body.). The described DELETE an obsolete webhook subscription requirement specifically calls for Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method.

Question 137

After deployment, an engineer must prove the proposed solution works. A test integration left duplicate subscriptions sending the same incident twice; the API supports DELETE /subscriptions/{id}. Which observed result is the most direct acceptance evidence?

  1. Network logs show no credential in the request URL and authenticated calls still succeed.
  2. The unwanted subscription no longer appears on list requests and duplicate events cease.
  3. The client waits for a terminal successful state and then fetches the completed report URI.
  4. A fixture of 240 clients produces exactly 240 unique IDs from three pages.

Explanation

Correct Answer

B:

The unwanted subscription no longer appears on list requests and duplicate events cease. Recommended implementation: Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method. Why the observation matters: DELETE targets removal of an identified resource rather than editing a collection through GET.

Incorrect Answers

A:

Network logs show no credential in the request URL and authenticated calls still succeed. That observation could confirm Bearer token separation from query string, not the current DELETE an obsolete webhook subscription case. For this case, the decisive observation is: The unwanted subscription no longer appears on list requests and duplicate events cease.

C:

The client waits for a terminal successful state and then fetches the completed report URI. That observation could confirm Synchronous request versus deferred job, not the current DELETE an obsolete webhook subscription case. For this case, the decisive observation is: The unwanted subscription no longer appears on list requests and duplicate events cease.

D:

A fixture of 240 clients produces exactly 240 unique IDs from three pages. That observation could confirm Traverse cursor-based pagination, not the current DELETE an obsolete webhook subscription case. For this case, the decisive observation is: The unwanted subscription no longer appears on list requests and duplicate events cease.

Question 138

A developer is explaining the underlying technical behavior. A test integration left duplicate subscriptions sending the same incident twice; the API supports DELETE /subscriptions/{id}. Which principle is most relevant to this case?

  1. Webhooks push event notifications to a subscriber endpoint rather than requiring repeated polling.
  2. DELETE targets removal of an identified resource rather than editing a collection through GET.
  3. 401 indicates missing or invalid authentication credentials for the requested resource.
  4. API versions and schema contracts determine available fields and response representations.

Explanation

Correct Answer

B:

DELETE targets removal of an identified resource rather than editing a collection through GET. This mechanism explains DELETE an obsolete webhook subscription. Action: Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method. Expected confirmation: The unwanted subscription no longer appears on list requests and duplicate events cease.

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 DELETE an obsolete webhook subscription case the operative principle is: DELETE targets removal of an identified resource rather than editing a collection through GET.

C:

401 indicates missing or invalid authentication credentials for the requested resource. This relates to 401 Unauthorized on expired bearer token. In the current DELETE an obsolete webhook subscription case the operative principle is: DELETE targets removal of an identified resource rather than editing a collection through GET.

D:

API versions and schema contracts determine available fields and response representations. This relates to Respect versioned API fields. In the current DELETE an obsolete webhook subscription case the operative principle is: DELETE targets removal of an identified resource rather than editing a collection through GET.

Question 139

A team does not apply the necessary control or correction. A test integration left duplicate subscriptions sending the same incident twice; the API supports DELETE /subscriptions/{id}. Which resulting failure or risk is most directly relevant?

  1. Simply deleting the current file does not remove the credential from repository history or attacker copies.
  2. Deleting the wrong ID could remove the production alarm pipeline.
  3. Broad except:pass logic can conceal genuine outages and report success.
  4. Silently treating missing fields as healthy can suppress outage reporting.

Explanation

Correct Answer

B:

Deleting the wrong ID could remove the production alarm pipeline. This is the direct exposure for DELETE an obsolete webhook subscription. Mitigate with: Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method. Check success by: The unwanted subscription no longer appears on list requests and duplicate events cease.

Incorrect Answers

A:

Simply deleting the current file does not remove the credential from repository history or attacker copies. This risk occurs in the different Rotate a compromised API key situation. For the given DELETE an obsolete webhook subscription requirement, the directly relevant risk is: Deleting the wrong ID could remove the production alarm pipeline.

C:

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 DELETE an obsolete webhook subscription requirement, the directly relevant risk is: Deleting the wrong ID could remove the production alarm pipeline.

D:

Silently treating missing fields as healthy can suppress outage reporting. This risk occurs in the different Respect versioned API fields situation. For the given DELETE an obsolete webhook subscription requirement, the directly relevant risk is: Deleting the wrong ID could remove the production alarm pipeline.

Question 140

The initial implementation fails or does not meet the expected behavior. A test integration left duplicate subscriptions sending the same incident twice; the API supports DELETE /subscriptions/{id}. Which investigation should be prioritized to diagnose the problem?

  1. Inspect status code, body length and the endpoint's documented success responses.
  2. Verify the identifier, endpoint authorization and returned deletion status before retrying.
  3. Inspect request If-None-Match, response status and stored ETag/body pairing.
  4. Inspect request headers, raw payload bytes and accepted media types in API docs.

Explanation

Correct Answer

B:

Verify the identifier, endpoint authorization and returned deletion status before retrying. These are the relevant initial evidence checks for DELETE an obsolete webhook subscription. Intended action: Issue DELETE for the verified unwanted subscription ID, using the documented authentication and method. Expected success condition: The unwanted subscription no longer appears on list requests and duplicate events cease.

Incorrect Answers

A:

Inspect status code, body length and the endpoint's documented success responses. This investigation primarily applies to Interpret 204 No Content, not the current DELETE an obsolete webhook subscription problem. Prioritize: Verify the identifier, endpoint authorization and returned deletion status before retrying.

C:

Inspect request If-None-Match, response status and stored ETag/body pairing. This investigation primarily applies to Handle conditional GET with 304, not the current DELETE an obsolete webhook subscription problem. Prioritize: Verify the identifier, endpoint authorization and returned deletion status before retrying.

D:

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 DELETE an obsolete webhook subscription problem. Prioritize: Verify the identifier, endpoint authorization and returned deletion status before retrying.

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

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