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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 64

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.

Question 631

A client receives 401 despite presenting a syntactically valid API path. What is the most effective configuration or design response?

  1. Review the token's role permissions for the requested action.
  2. Use HTTPS with verified server TLS certificates for REST API calls.
  3. Investigate missing, expired or invalid credentials rather than the resource name first.
  4. Remove and rotate the secret and move it to protected secret storage.

Explanation

Correct Answer

C:

HTTP 401 signals an authentication failure rather than a generic parsing problem. The most direct remediation is investigate missing, expired or invalid credentials rather than the resource name first. A practical acceptance test is the API returns success after a valid authorized credential is supplied. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

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 receives 401 despite presenting a syntactically valid API path.

B:

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 receives 401 despite presenting a syntactically valid API path.

D:

This choice addresses a different situation: A stored REST API token appears in an automation repository. Source-controlled credentials can be copied and reused outside intended applications. It does not specifically correct the issue here: a client receives 401 despite presenting a syntactically valid API path.

Question 632

The change request says: investigate missing, expired or invalid credentials rather than the resource name first. Which verification result is most decisive?

  1. The same path succeeds only with a role permitted to perform that action.
  2. The API returns success after a valid authorized credential is supplied.
  3. Capture shows TLS traffic and client validates the expected server identity.
  4. The exposed token is revoked and the workflow retrieves a new secret securely.

Explanation

Correct Answer

B:

The API returns success after a valid authorized credential is supplied. This is the targeted operational evidence for the change. HTTP 401 signals an authentication failure rather than a generic parsing problem. 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: 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.

C:

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.

D:

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.

Question 633

A client receives 403 using a valid token and assumes the endpoint is offline. Which change should the network engineer prioritize?

  1. Review the token's role permissions for the requested action.
  2. Enable request audit trails tied to identity and requested resource.
  3. Issue scoped least-privilege API credentials or role-bound tokens.
  4. Install a valid trust chain and keep hostname validation enabled.

Explanation

Correct Answer

A:

HTTP 403 indicates recognized but insufficient authorization in typical REST APIs. The most direct remediation is review the token's role permissions for the requested action. A practical acceptance test is the same path succeeds only with a role permitted to perform that action. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

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 client receives 403 using a valid token and assumes the endpoint is offline.

C:

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 client receives 403 using a valid token and assumes the endpoint is offline.

D:

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 client receives 403 using a valid token and assumes the endpoint is offline.

Question 634

A post-change test follows this action: review the token's role permissions for the requested action. Which result demonstrates success?

  1. Audit logs include caller identity, endpoint, method, result and timestamp.
  2. A token cannot perform an API operation outside its assigned role.
  3. The REST client succeeds only for a certificate matching its trusted authority and name.
  4. The same path succeeds only with a role permitted to perform that action.

Explanation

Correct Answer

D:

The same path succeeds only with a role permitted to perform that action. This is the targeted operational evidence for the change. HTTP 403 indicates recognized but insufficient authorization in typical REST APIs. 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: 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.

B:

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.

C:

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.

Question 635

An audit wants to know which automation identity changed a switch via API. Which remediation best resolves the described symptom?

  1. Use HTTPS with verified server TLS certificates for REST API calls.
  2. Remove and rotate the secret and move it to protected secret storage.
  3. Enable request audit trails tied to identity and requested resource.
  4. Apply rate limits and monitoring to the API service.

Explanation

Correct Answer

C:

REST request attribution supports investigation and access governance. The most direct remediation is enable request audit trails tied to identity and requested resource. A practical acceptance test is audit logs include caller identity, endpoint, method, result and timestamp. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

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: an audit wants to know which automation identity changed a switch via API.

B:

This choice addresses a different situation: A stored REST API token appears in an automation repository. Source-controlled credentials can be copied and reused outside intended applications. It does not specifically correct the issue here: an audit wants to know which automation identity changed a switch via API.

D:

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 audit wants to know which automation identity changed a switch via API.

Question 636

During acceptance testing after enable request audit trails tied to identity and requested resource., which evidence is most relevant?

  1. Capture shows TLS traffic and client validates the expected server identity.
  2. Audit logs include caller identity, endpoint, method, result and timestamp.
  3. The exposed token is revoked and the workflow retrieves a new secret securely.
  4. The service responds with controlled rate-limit errors under overload.

Explanation

Correct Answer

B:

Audit logs include caller identity, endpoint, method, result and timestamp. This is the targeted operational evidence for the change. REST request attribution supports investigation and access governance. 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 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.

C:

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.

D:

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.

Question 637

An IDS alerts on threats but a team expects it to block all attacks automatically. Which action most directly addresses this situation?

  1. Deploy an inline IPS or NGFW prevention policy where blocking is required.
  2. Use NGFW application-aware identification and policy rather than port-only filtering.
  3. Use Cisco TrustSec security group tags and SGT-based policy.
  4. Classify or overwrite endpoint SGT at the approved trust boundary.

Explanation

Correct Answer

A:

Detection-only monitoring is not automatically active prevention. The most direct remediation is deploy an inline IPS or NGFW prevention policy where blocking is required. A practical acceptance test is an authorized test signature is blocked by the inline enforcement device. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A firewall is allowing an application over TCP 443 that must be denied. Multiple applications can share the same transport port. It does not specifically correct the issue here: an IDS alerts on threats but a team expects it to block all attacks automatically.

C:

This choice addresses a different situation: A security team wants to associate policy with identity groups rather than changing IP subnets. Group-based policy decouples authorization from the endpoint's current IP. It does not specifically correct the issue here: an IDS alerts on threats but a team expects it to block all attacks automatically.

D:

This choice addresses a different situation: A device receives untrusted SGT markings from a non-trustworthy edge. Trusting user-supplied group tags can bypass segmentation. It does not specifically correct the issue here: an IDS alerts on threats but a team expects it to block all attacks automatically.

Question 638

An operator has applied the following change: deploy an inline IPS or NGFW prevention policy where blocking is required. Which observation best confirms it works?

  1. The target application is blocked while unrelated approved HTTPS remains usable.
  2. SGT-to-SGT policy counters track permitted and denied flows.
  3. Packet group labels reflect policy-derived identity rather than arbitrary endpoint marks.
  4. An authorized test signature is blocked by the inline enforcement device.

Explanation

Correct Answer

D:

An authorized test signature is blocked by the inline enforcement device. This is the targeted operational evidence for the change. Detection-only monitoring is not automatically active prevention. 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 NGFW application-aware identification and policy rather than port-only filtering. Multiple applications can share the same transport port. 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: Use Cisco TrustSec security group tags and SGT-based policy. Group-based policy decouples authorization from the endpoint's current IP. 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: Classify or overwrite endpoint SGT at the approved trust boundary. Trusting user-supplied group tags can bypass segmentation. 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 639

A firewall is allowing an application over TCP 443 that must be denied. What is the most effective configuration or design response?

  1. Place appropriate internal segmentation firewall or distributed enforcement controls.
  2. Ensure supported SGT classification and propagation between nodes.
  3. Use NGFW application-aware identification and policy rather than port-only filtering.
  4. Deploy MACsec on supported Ethernet links.

Explanation

Correct Answer

C:

Multiple applications can share the same transport port. The most direct remediation is use NGFW application-aware identification and policy rather than port-only filtering. A practical acceptance test is the target application is blocked while unrelated approved HTTPS remains usable. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A segmented datacenter needs visibility into east-west flows between servers. Perimeter-only filtering misses lateral traffic inside a datacenter. It does not specifically correct the issue here: a firewall is allowing an application over TCP 443 that must be denied.

B:

This choice addresses a different situation: Two TrustSec switches need to propagate endpoint group identity through the fabric. SGT policy requires group context at enforcement points. It does not specifically correct the issue here: a firewall is allowing an application over TCP 443 that must be denied.

D:

This choice addresses a different situation: A LAN uplink transmits confidential management frames and needs hop-by-hop protection. MACsec encrypts/authenticates frames on a Layer-2 hop rather than only at L3. It does not specifically correct the issue here: a firewall is allowing an application over TCP 443 that must be denied.

Question 640

After implementing use NGFW application-aware identification and policy rather than port-only filtering., which operational evidence should an engineer collect?

  1. Traffic between protected segments is logged and policy-enforced.
  2. The target application is blocked while unrelated approved HTTPS remains usable.
  3. The receiving switch shows the intended source group tag on classified traffic.
  4. Link session displays active MACsec secure channels and protected frame counters.

Explanation

Correct Answer

B:

The target application is blocked while unrelated approved HTTPS remains usable. This is the targeted operational evidence for the change. Multiple applications can share the same transport port. 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: Place appropriate internal segmentation firewall or distributed enforcement controls. Perimeter-only filtering misses lateral traffic inside a datacenter. 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: Ensure supported SGT classification and propagation between nodes. SGT policy requires group context at enforcement points. 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: Deploy MACsec on supported Ethernet links. MACsec encrypts/authenticates frames on a Layer-2 hop rather than only at L3. 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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