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Exam Code: 350-401
Exam Name: Implementing Cisco Enterprise Network Core Technologies (ENCOR)
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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 77

Question 760

During acceptance testing after refresh or correct the authentication credential instead of repeating unchanged requests., which evidence is most relevant?

  1. The same request succeeds only for a properly privileged identity.
  2. A valid credential yields an authorized response.
  3. The subsequent compatible update succeeds without overriding unrelated state.
  4. Server issue is resolved and the same valid request completes successfully.

Explanation

Correct Answer

B:

A valid credential yields an authorized response. This is the targeted operational evidence for the change. HTTP 401 usually means authentication is missing or invalid. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Grant the required API authorization rather than reauthenticating blindly. HTTP 403 indicates the authenticated principal lacks permission. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Resolve the current resource state or conflicting operation before retrying. Conflict means the request cannot complete under current server state. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Investigate server-side failure and logs before modifying client payload blindly. HTTP 500 indicates an internal server error. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 761

An API returns 403 Forbidden with a recognized token. What is the most appropriate corrective measure?

  1. Grant the required API authorization rather than reauthenticating blindly.
  2. Use the correct modeled resource path and list key.
  3. Honor Retry-After/backoff limits before attempting more requests.
  4. Check Accept media type and parse the returned YANG-modeled payload.

Explanation

Correct Answer

A:

HTTP 403 indicates the authenticated principal lacks permission. The most direct remediation is grant the required API authorization rather than reauthenticating blindly. A practical acceptance test is the same request succeeds only for a properly privileged identity. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A RESTCONF resource returns 404 Not Found when an invalid interface key is supplied. A valid API root can still return 404 for a nonexistent child resource. It does not specifically correct the issue here: an API returns 403 Forbidden with a recognized token.

C:

This choice addresses a different situation: An API is rate limited with HTTP 429 Too Many Requests. 429 signals throttling rather than an invalid path or credential. It does not specifically correct the issue here: an API returns 403 Forbidden with a recognized token.

D:

This choice addresses a different situation: A RESTCONF GET returns status 200 with an unexpected representation. Successful HTTP status does not establish that the parser expects the correct content type. It does not specifically correct the issue here: an API returns 403 Forbidden with a recognized token.

Question 762

An operator has applied the following change: grant the required API authorization rather than reauthenticating blindly. Which observation best confirms it works?

  1. GET succeeds against the correct interface path.
  2. Requests succeed at an acceptable paced rate without repeated throttling.
  3. Response has supported YANG JSON/XML media type and decodes successfully.
  4. The same request succeeds only for a properly privileged identity.

Explanation

Correct Answer

D:

The same request succeeds only for a properly privileged identity. This is the targeted operational evidence for the change. HTTP 403 indicates the authenticated principal lacks permission. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Use the correct modeled resource path and list key. A valid API root can still return 404 for a nonexistent child resource. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Honor Retry-After/backoff limits before attempting more requests. 429 signals throttling rather than an invalid path or credential. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Check Accept media type and parse the returned YANG-modeled payload. Successful HTTP status does not establish that the parser expects the correct content type. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 763

A RESTCONF resource returns 404 Not Found when an invalid interface key is supplied. Which action most directly addresses this situation?

  1. Resolve the current resource state or conflicting operation before retrying.
  2. Investigate server-side failure and logs before modifying client payload blindly.
  3. Use the correct modeled resource path and list key.
  4. Interpret 201 as successful resource creation.

Explanation

Correct Answer

C:

A valid API root can still return 404 for a nonexistent child resource. The most direct remediation is use the correct modeled resource path and list key. A practical acceptance test is gET succeeds against the correct interface path. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An API returns HTTP 409 Conflict during concurrent configuration changes. Conflict means the request cannot complete under current server state. It does not specifically correct the issue here: a RESTCONF resource returns 404 Not Found when an invalid interface key is supplied.

B:

This choice addresses a different situation: An API returns status 500 after the server accepts a syntactically valid call. HTTP 500 indicates an internal server error. It does not specifically correct the issue here: a RESTCONF resource returns 404 Not Found when an invalid interface key is supplied.

D:

This choice addresses a different situation: An API POST returns HTTP 201 Created and the script treats it as error. HTTP 201 indicates a resource was created. It does not specifically correct the issue here: a RESTCONF resource returns 404 Not Found when an invalid interface key is supplied.

Question 764

After implementing use the correct modeled resource path and list key., which operational evidence should an engineer collect?

  1. The subsequent compatible update succeeds without overriding unrelated state.
  2. GET succeeds against the correct interface path.
  3. Server issue is resolved and the same valid request completes successfully.
  4. The response identifies the newly created resource and follow-up GET succeeds.

Explanation

Correct Answer

B:

GET succeeds against the correct interface path. This is the targeted operational evidence for the change. A valid API root can still return 404 for a nonexistent child resource. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Resolve the current resource state or conflicting operation before retrying. Conflict means the request cannot complete under current server state. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Investigate server-side failure and logs before modifying client payload blindly. HTTP 500 indicates an internal server error. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Interpret 201 as successful resource creation. HTTP 201 indicates a resource was created. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 765

An API returns HTTP 409 Conflict during concurrent configuration changes. What is the most effective configuration or design response?

  1. Resolve the current resource state or conflicting operation before retrying.
  2. Honor Retry-After/backoff limits before attempting more requests.
  3. Check Accept media type and parse the returned YANG-modeled payload.
  4. Interpret the 204 as successful operation without response body.

Explanation

Correct Answer

A:

Conflict means the request cannot complete under current server state. The most direct remediation is resolve the current resource state or conflicting operation before retrying. A practical acceptance test is the subsequent compatible update succeeds without overriding unrelated state. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An API is rate limited with HTTP 429 Too Many Requests. 429 signals throttling rather than an invalid path or credential. It does not specifically correct the issue here: an API returns HTTP 409 Conflict during concurrent configuration changes.

C:

This choice addresses a different situation: A RESTCONF GET returns status 200 with an unexpected representation. Successful HTTP status does not establish that the parser expects the correct content type. It does not specifically correct the issue here: an API returns HTTP 409 Conflict during concurrent configuration changes.

D:

This choice addresses a different situation: An API responds 204 No Content to a DELETE. HTTP 204 deliberately returns no content after success. It does not specifically correct the issue here: an API returns HTTP 409 Conflict during concurrent configuration changes.

Question 766

The change request says: resolve the current resource state or conflicting operation before retrying. Which verification result is most decisive?

  1. Requests succeed at an acceptable paced rate without repeated throttling.
  2. Response has supported YANG JSON/XML media type and decodes successfully.
  3. The resource is absent on a subsequent authenticated GET.
  4. The subsequent compatible update succeeds without overriding unrelated state.

Explanation

Correct Answer

D:

The subsequent compatible update succeeds without overriding unrelated state. This is the targeted operational evidence for the change. Conflict means the request cannot complete under current server state. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Honor Retry-After/backoff limits before attempting more requests. 429 signals throttling rather than an invalid path or credential. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Check Accept media type and parse the returned YANG-modeled payload. Successful HTTP status does not establish that the parser expects the correct content type. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Interpret the 204 as successful operation without response body. HTTP 204 deliberately returns no content after success. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 767

An API is rate limited with HTTP 429 Too Many Requests. Which change should the network engineer prioritize?

  1. Investigate server-side failure and logs before modifying client payload blindly.
  2. Interpret 201 as successful resource creation.
  3. Honor Retry-After/backoff limits before attempting more requests.
  4. Validate JSON syntax and required modeled fields against the request schema.

Explanation

Correct Answer

C:

429 signals throttling rather than an invalid path or credential. The most direct remediation is honor Retry-After/backoff limits before attempting more requests. A practical acceptance test is requests succeed at an acceptable paced rate without repeated throttling. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An API returns status 500 after the server accepts a syntactically valid call. HTTP 500 indicates an internal server error. It does not specifically correct the issue here: an API is rate limited with HTTP 429 Too Many Requests.

B:

This choice addresses a different situation: An API POST returns HTTP 201 Created and the script treats it as error. HTTP 201 indicates a resource was created. It does not specifically correct the issue here: an API is rate limited with HTTP 429 Too Many Requests.

D:

This choice addresses a different situation: An API call returns 400 Bad Request after a configuration payload edit. HTTP 400 typically indicates invalid request data or syntax. It does not specifically correct the issue here: an API is rate limited with HTTP 429 Too Many Requests.

Question 768

A post-change test follows this action: honor Retry-After/backoff limits before attempting more requests. Which result demonstrates success?

  1. Server issue is resolved and the same valid request completes successfully.
  2. Requests succeed at an acceptable paced rate without repeated throttling.
  3. The response identifies the newly created resource and follow-up GET succeeds.
  4. Corrected payload is accepted without the previous 400.

Explanation

Correct Answer

B:

Requests succeed at an acceptable paced rate without repeated throttling. This is the targeted operational evidence for the change. 429 signals throttling rather than an invalid path or credential. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Investigate server-side failure and logs before modifying client payload blindly. HTTP 500 indicates an internal server error. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Interpret 201 as successful resource creation. HTTP 201 indicates a resource was created. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Validate JSON syntax and required modeled fields against the request schema. HTTP 400 typically indicates invalid request data or syntax. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 769

An API returns status 500 after the server accepts a syntactically valid call. Which remediation best resolves the described symptom?

  1. Investigate server-side failure and logs before modifying client payload blindly.
  2. Check Accept media type and parse the returned YANG-modeled payload.
  3. Interpret the 204 as successful operation without response body.
  4. Refresh or correct the authentication credential instead of repeating unchanged requests.

Explanation

Correct Answer

A:

HTTP 500 indicates an internal server error. The most direct remediation is investigate server-side failure and logs before modifying client payload blindly. A practical acceptance test is server issue is resolved and the same valid request completes successfully. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A RESTCONF GET returns status 200 with an unexpected representation. Successful HTTP status does not establish that the parser expects the correct content type. It does not specifically correct the issue here: an API returns status 500 after the server accepts a syntactically valid call.

C:

This choice addresses a different situation: An API responds 204 No Content to a DELETE. HTTP 204 deliberately returns no content after success. It does not specifically correct the issue here: an API returns status 500 after the server accepts a syntactically valid call.

D:

This choice addresses a different situation: An API returns 401 Unauthorized and the script retries endlessly. HTTP 401 usually means authentication is missing or invalid. It does not specifically correct the issue here: an API returns status 500 after the server accepts a syntactically valid call.

Question 770

During acceptance testing after investigate server-side failure and logs before modifying client payload blindly., which evidence is most relevant?

  1. Response has supported YANG JSON/XML media type and decodes successfully.
  2. The resource is absent on a subsequent authenticated GET.
  3. A valid credential yields an authorized response.
  4. Server issue is resolved and the same valid request completes successfully.

Explanation

Correct Answer

D:

Server issue is resolved and the same valid request completes successfully. This is the targeted operational evidence for the change. HTTP 500 indicates an internal server error. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Check Accept media type and parse the returned YANG-modeled payload. Successful HTTP status does not establish that the parser expects the correct content type. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Interpret the 204 as successful operation without response body. HTTP 204 deliberately returns no content after success. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Refresh or correct the authentication credential instead of repeating unchanged requests. HTTP 401 usually means authentication is missing or invalid. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

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