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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 63

Question 620

After implementing issue scoped least-privilege API credentials or role-bound tokens., which operational evidence should an engineer collect?

  1. The exposed token is revoked and the workflow retrieves a new secret securely.
  2. A token cannot perform an API operation outside its assigned role.
  3. The service responds with controlled rate-limit errors under overload.
  4. Requests for out-of-scope device IDs are forbidden even with valid login.

Explanation

Correct Answer

B:

A token cannot perform an API operation outside its assigned role. This is the targeted operational evidence for the change. Broad reusable tokens increase the blast radius of compromise. 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: Remove and rotate the secret and move it to protected secret storage. Source-controlled credentials can be copied and reused outside intended applications. 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: Apply rate limits and monitoring to the API service. Throttling reduces availability risk from excessive authenticated or unauthenticated calls. 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: Enforce object-level access authorization in the API. API object references must be checked against caller rights to prevent data leakage. 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 621

A stored REST API token appears in an automation repository. Which change should the network engineer prioritize?

  1. Remove and rotate the secret and move it to protected secret storage.
  2. Install a valid trust chain and keep hostname validation enabled.
  3. Require authentication and authorization before permitting REST writes.
  4. Investigate missing, expired or invalid credentials rather than the resource name first.

Explanation

Correct Answer

A:

Source-controlled credentials can be copied and reused outside intended applications. The most direct remediation is remove and rotate the secret and move it to protected secret storage. A practical acceptance test is the exposed token is revoked and the workflow retrieves a new secret securely. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An operator disables TLS certificate validation to make RESTCONF work. Skipping TLS validation allows man-in-the-middle impersonation. It does not specifically correct the issue here: a stored REST API token appears in an automation repository.

C:

This choice addresses a different situation: A client sends a resource modification without authenticated identity. Transport reachability does not imply permission to modify device configuration. It does not specifically correct the issue here: a stored REST API token appears in an automation repository.

D:

This choice addresses a different situation: A client receives 401 despite presenting a syntactically valid API path. HTTP 401 signals an authentication failure rather than a generic parsing problem. It does not specifically correct the issue here: a stored REST API token appears in an automation repository.

Question 622

The change request says: remove and rotate the secret and move it to protected secret storage. Which verification result is most decisive?

  1. The REST client succeeds only for a certificate matching its trusted authority and name.
  2. Anonymous modification is denied while authorized scoped identity succeeds.
  3. The API returns success after a valid authorized credential is supplied.
  4. The exposed token is revoked and the workflow retrieves a new secret securely.

Explanation

Correct Answer

D:

The exposed token is revoked and the workflow retrieves a new secret securely. This is the targeted operational evidence for the change. Source-controlled credentials can be copied and reused outside intended applications. 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: Install a valid trust chain and keep hostname validation enabled. Skipping TLS validation allows man-in-the-middle impersonation. 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: Require authentication and authorization before permitting REST writes. Transport reachability does not imply permission to modify device configuration. 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 missing, expired or invalid credentials rather than the resource name first. HTTP 401 signals an authentication failure rather than a generic parsing problem. 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 623

An operator disables TLS certificate validation to make RESTCONF work. Which remediation best resolves the described symptom?

  1. Apply rate limits and monitoring to the API service.
  2. Enforce object-level access authorization in the API.
  3. Install a valid trust chain and keep hostname validation enabled.
  4. Review the token's role permissions for the requested action.

Explanation

Correct Answer

C:

Skipping TLS validation allows man-in-the-middle impersonation. The most direct remediation is install a valid trust chain and keep hostname validation enabled. A practical acceptance test is the REST client succeeds only for a certificate matching its trusted authority and name. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An API has no per-user request quota and is flooded by abusive automation. Throttling reduces availability risk from excessive authenticated or unauthenticated calls. It does not specifically correct the issue here: an operator disables TLS certificate validation to make RESTCONF work.

B:

This choice addresses a different situation: A network API returns data about devices outside a user's managed domain. API object references must be checked against caller rights to prevent data leakage. It does not specifically correct the issue here: an operator disables TLS certificate validation to make RESTCONF work.

D:

This choice addresses a different situation: A client receives 403 using a valid token and assumes the endpoint is offline. HTTP 403 indicates recognized but insufficient authorization in typical REST APIs. It does not specifically correct the issue here: an operator disables TLS certificate validation to make RESTCONF work.

Question 624

A post-change test follows this action: install a valid trust chain and keep hostname validation enabled. Which result demonstrates success?

  1. The service responds with controlled rate-limit errors under overload.
  2. The REST client succeeds only for a certificate matching its trusted authority and name.
  3. Requests for out-of-scope device IDs are forbidden even with valid login.
  4. The same path succeeds only with a role permitted to perform that action.

Explanation

Correct Answer

B:

The REST client succeeds only for a certificate matching its trusted authority and name. This is the targeted operational evidence for the change. Skipping TLS validation allows man-in-the-middle impersonation. 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: Apply rate limits and monitoring to the API service. Throttling reduces availability risk from excessive authenticated or unauthenticated calls. 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: Enforce object-level access authorization in the API. API object references must be checked against caller rights to prevent data leakage. 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: Review the token's role permissions for the requested action. HTTP 403 indicates recognized but insufficient authorization in typical REST APIs. 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 625

An API has no per-user request quota and is flooded by abusive automation. How should the team implement the required behavior?

  1. Apply rate limits and monitoring to the API service.
  2. Require authentication and authorization before permitting REST writes.
  3. Investigate missing, expired or invalid credentials rather than the resource name first.
  4. Enable request audit trails tied to identity and requested resource.

Explanation

Correct Answer

A:

Throttling reduces availability risk from excessive authenticated or unauthenticated calls. The most direct remediation is apply rate limits and monitoring to the API service. A practical acceptance test is the service responds with controlled rate-limit errors under overload. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A client sends a resource modification without authenticated identity. Transport reachability does not imply permission to modify device configuration. It does not specifically correct the issue here: an API has no per-user request quota and is flooded by abusive automation.

C:

This choice addresses a different situation: A client receives 401 despite presenting a syntactically valid API path. HTTP 401 signals an authentication failure rather than a generic parsing problem. It does not specifically correct the issue here: an API has no per-user request quota and is flooded by abusive automation.

D:

This choice addresses a different situation: An audit wants to know which automation identity changed a switch via API. REST request attribution supports investigation and access governance. It does not specifically correct the issue here: an API has no per-user request quota and is flooded by abusive automation.

Question 626

During acceptance testing after apply rate limits and monitoring to the API service., which evidence is most relevant?

  1. Anonymous modification is denied while authorized scoped identity succeeds.
  2. The API returns success after a valid authorized credential is supplied.
  3. Audit logs include caller identity, endpoint, method, result and timestamp.
  4. The service responds with controlled rate-limit errors under overload.

Explanation

Correct Answer

D:

The service responds with controlled rate-limit errors under overload. This is the targeted operational evidence for the change. Throttling reduces availability risk from excessive authenticated or unauthenticated calls. 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: Require authentication and authorization before permitting REST writes. Transport reachability does not imply permission to modify device configuration. 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: Investigate missing, expired or invalid credentials rather than the resource name first. HTTP 401 signals an authentication failure rather than a generic parsing problem. 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: Enable request audit trails tied to identity and requested resource. REST request attribution supports investigation and access governance. 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 627

A client sends a resource modification without authenticated identity. What is the most appropriate corrective measure?

  1. Enforce object-level access authorization in the API.
  2. Review the token's role permissions for the requested action.
  3. Require authentication and authorization before permitting REST writes.
  4. Use HTTPS with verified server TLS certificates for REST API calls.

Explanation

Correct Answer

C:

Transport reachability does not imply permission to modify device configuration. The most direct remediation is require authentication and authorization before permitting REST writes. A practical acceptance test is anonymous modification is denied while authorized scoped identity succeeds. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A network API returns data about devices outside a user's managed domain. API object references must be checked against caller rights to prevent data leakage. It does not specifically correct the issue here: a client sends a resource modification without authenticated identity.

B:

This choice addresses a different situation: A client receives 403 using a valid token and assumes the endpoint is offline. HTTP 403 indicates recognized but insufficient authorization in typical REST APIs. It does not specifically correct the issue here: a client sends a resource modification without authenticated identity.

D:

This choice addresses a different situation: An automation client calls a device API over HTTP with credentials. TLS protects credentials and payloads from passive interception and endpoint impersonation. It does not specifically correct the issue here: a client sends a resource modification without authenticated identity.

Question 628

An operator has applied the following change: require authentication and authorization before permitting REST writes. Which observation best confirms it works?

  1. Requests for out-of-scope device IDs are forbidden even with valid login.
  2. Anonymous modification is denied while authorized scoped identity succeeds.
  3. The same path succeeds only with a role permitted to perform that action.
  4. Capture shows TLS traffic and client validates the expected server identity.

Explanation

Correct Answer

B:

Anonymous modification is denied while authorized scoped identity succeeds. This is the targeted operational evidence for the change. Transport reachability does not imply permission to modify device configuration. 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: Enforce object-level access authorization in the API. API object references must be checked against caller rights to prevent data leakage. 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: Review the token's role permissions for the requested action. HTTP 403 indicates recognized but insufficient authorization in typical REST APIs. 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: Use HTTPS with verified server TLS certificates for REST API calls. TLS protects credentials and payloads from passive interception and endpoint impersonation. 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 629

A network API returns data about devices outside a user's managed domain. Which action most directly addresses this situation?

  1. Enforce object-level access authorization in the API.
  2. Investigate missing, expired or invalid credentials rather than the resource name first.
  3. Enable request audit trails tied to identity and requested resource.
  4. Issue scoped least-privilege API credentials or role-bound tokens.

Explanation

Correct Answer

A:

API object references must be checked against caller rights to prevent data leakage. The most direct remediation is enforce object-level access authorization in the API. A practical acceptance test is requests for out-of-scope device IDs are forbidden even with valid login. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A client receives 401 despite presenting a syntactically valid API path. HTTP 401 signals an authentication failure rather than a generic parsing problem. It does not specifically correct the issue here: a network API returns data about devices outside a user's managed domain.

C:

This choice addresses a different situation: An audit wants to know which automation identity changed a switch via API. REST request attribution supports investigation and access governance. It does not specifically correct the issue here: a network API returns data about devices outside a user's managed domain.

D:

This choice addresses a different situation: An API integration uses one global administrator token for every maintenance script. Broad reusable tokens increase the blast radius of compromise. It does not specifically correct the issue here: a network API returns data about devices outside a user's managed domain.

Question 630

After implementing enforce object-level access authorization in the API., which operational evidence should an engineer collect?

  1. The API returns success after a valid authorized credential is supplied.
  2. Audit logs include caller identity, endpoint, method, result and timestamp.
  3. A token cannot perform an API operation outside its assigned role.
  4. Requests for out-of-scope device IDs are forbidden even with valid login.

Explanation

Correct Answer

D:

Requests for out-of-scope device IDs are forbidden even with valid login. This is the targeted operational evidence for the change. API object references must be checked against caller rights to prevent data leakage. 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 missing, expired or invalid credentials rather than the resource name first. HTTP 401 signals an authentication failure rather than a generic parsing problem. 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: Enable request audit trails tied to identity and requested resource. REST request attribution supports investigation and access governance. 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: Issue scoped least-privilege API credentials or role-bound tokens. Broad reusable tokens increase the blast radius of compromise. 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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