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Exam Name: Implementing Cisco Enterprise Network Core Technologies (ENCOR)
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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 66

Question 650

After implementing deploy MACsec on supported Ethernet links., which operational evidence should an engineer collect?

  1. MKA session becomes secured with matching cipher and key agreement.
  2. EDR records malicious process behavior and isolation blocks lateral access.
  3. An untrusted office-connected device remains denied despite local IP address.
  4. Link session displays active MACsec secure channels and protected frame counters.

Explanation

Correct Answer

D:

Link session displays active MACsec secure channels and protected frame counters. This is the targeted operational evidence for the change. MACsec encrypts/authenticates frames on a Layer-2 hop rather than only at L3. 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: Align MKA keying and supported cipher policy on both ends. MACsec session negotiation requires compatible key agreement. 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: Deploy endpoint detection and response plus isolate affected systems. Endpoint telemetry detects host behavior not visible in network perimeter logs. 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: Adopt identity/device-aware zero-trust checks rather than location as sole authority. Physical network placement is not proof of device health or user entitlement. 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 651

Two MACsec peers never establish secured adjacency due to mismatched key parameters. What is the most effective configuration or design response?

  1. Use end-to-end IPsec or TLS where application-path confidentiality is required.
  2. Use supported stateful HA with synchronized policy and state.
  3. Align MKA keying and supported cipher policy on both ends.
  4. Review policy rule match and app identification logs before disabling IPS globally.

Explanation

Correct Answer

C:

MACsec session negotiation requires compatible key agreement. The most direct remediation is align MKA keying and supported cipher policy on both ends. A practical acceptance test is mKA session becomes secured with matching cipher and key agreement. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A security architect assumes MACsec protects routed packets end-to-end through multiple routers. MACsec protection normally terminates at the adjacent protected Ethernet hop. It does not specifically correct the issue here: two MACsec peers never establish secured adjacency due to mismatched key parameters.

B:

This choice addresses a different situation: A high-availability NGFW pair should preserve traffic when one firewall fails. Stateless device redundancy may disrupt existing inspected sessions. It does not specifically correct the issue here: two MACsec peers never establish secured adjacency due to mismatched key parameters.

D:

This choice addresses a different situation: A next-generation firewall blocks an application after an unexpected signature update. One false positive calls for scoped tuning rather than removing all defense. It does not specifically correct the issue here: two MACsec peers never establish secured adjacency due to mismatched key parameters.

Question 652

The change request says: align MKA keying and supported cipher policy on both ends. Which verification result is most decisive?

  1. Each MACsec hop is independently secured while routed end-to-end payload needs other encryption.
  2. MKA session becomes secured with matching cipher and key agreement.
  3. A controlled firewall failover retains permitted sessions where state sync is supported.
  4. The specific flow matches the documented exception while general inspection remains enabled.

Explanation

Correct Answer

B:

MKA session becomes secured with matching cipher and key agreement. This is the targeted operational evidence for the change. MACsec session negotiation requires compatible key agreement. 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 end-to-end IPsec or TLS where application-path confidentiality is required. MACsec protection normally terminates at the adjacent protected Ethernet hop. 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 supported stateful HA with synchronized policy and state. Stateless device redundancy may disrupt existing inspected sessions. 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 policy rule match and app identification logs before disabling IPS globally. One false positive calls for scoped tuning rather than removing all defense. 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 653

A security architect assumes MACsec protects routed packets end-to-end through multiple routers. Which change should the network engineer prioritize?

  1. Use end-to-end IPsec or TLS where application-path confidentiality is required.
  2. Deploy endpoint detection and response plus isolate affected systems.
  3. Adopt identity/device-aware zero-trust checks rather than location as sole authority.
  4. Add behavior-based endpoint detection controls.

Explanation

Correct Answer

A:

MACsec protection normally terminates at the adjacent protected Ethernet hop. The most direct remediation is use end-to-end IPsec or TLS where application-path confidentiality is required. A practical acceptance test is each MACsec hop is independently secured while routed end-to-end payload needs other encryption. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A branch has malware on a host and perimeter firewall logs show normal traffic. Endpoint telemetry detects host behavior not visible in network perimeter logs. It does not specifically correct the issue here: a security architect assumes MACsec protects routed packets end-to-end through multiple routers.

C:

This choice addresses a different situation: A new access policy trusts every device located on the office subnet. Physical network placement is not proof of device health or user entitlement. It does not specifically correct the issue here: a security architect assumes MACsec protects routed packets end-to-end through multiple routers.

D:

This choice addresses a different situation: An endpoint defense policy checks only antivirus signatures and misses suspicious process trees. Modern endpoint security uses behavioral signals in addition to signature matching. It does not specifically correct the issue here: a security architect assumes MACsec protects routed packets end-to-end through multiple routers.

Question 654

A post-change test follows this action: use end-to-end IPsec or TLS where application-path confidentiality is required. Which result demonstrates success?

  1. EDR records malicious process behavior and isolation blocks lateral access.
  2. An untrusted office-connected device remains denied despite local IP address.
  3. Threat telemetry records anomalous execution chains and triggers the response policy.
  4. Each MACsec hop is independently secured while routed end-to-end payload needs other encryption.

Explanation

Correct Answer

D:

Each MACsec hop is independently secured while routed end-to-end payload needs other encryption. This is the targeted operational evidence for the change. MACsec protection normally terminates at the adjacent protected Ethernet hop. 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: Deploy endpoint detection and response plus isolate affected systems. Endpoint telemetry detects host behavior not visible in network perimeter logs. 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: Adopt identity/device-aware zero-trust checks rather than location as sole authority. Physical network placement is not proof of device health or user entitlement. 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: Add behavior-based endpoint detection controls. Modern endpoint security uses behavioral signals in addition to signature matching. 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 655

A branch has malware on a host and perimeter firewall logs show normal traffic. Which remediation best resolves the described symptom?

  1. Use supported stateful HA with synchronized policy and state.
  2. Review policy rule match and app identification logs before disabling IPS globally.
  3. Deploy endpoint detection and response plus isolate affected systems.
  4. Define least-privilege SGT policy among functional groups.

Explanation

Correct Answer

C:

Endpoint telemetry detects host behavior not visible in network perimeter logs. The most direct remediation is deploy endpoint detection and response plus isolate affected systems. A practical acceptance test is eDR records malicious process behavior and isolation blocks lateral access. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A high-availability NGFW pair should preserve traffic when one firewall fails. Stateless device redundancy may disrupt existing inspected sessions. It does not specifically correct the issue here: a branch has malware on a host and perimeter firewall logs show normal traffic.

B:

This choice addresses a different situation: A next-generation firewall blocks an application after an unexpected signature update. One false positive calls for scoped tuning rather than removing all defense. It does not specifically correct the issue here: a branch has malware on a host and perimeter firewall logs show normal traffic.

D:

This choice addresses a different situation: A campus segmentation plan uses one common allow-all SGT rule for every group. An unconstrained group matrix defeats group-based segmentation. It does not specifically correct the issue here: a branch has malware on a host and perimeter firewall logs show normal traffic.

Question 656

During acceptance testing after deploy endpoint detection and response plus isolate affected systems., which evidence is most relevant?

  1. A controlled firewall failover retains permitted sessions where state sync is supported.
  2. EDR records malicious process behavior and isolation blocks lateral access.
  3. The specific flow matches the documented exception while general inspection remains enabled.
  4. Only approved group pairs show permitted counters in TrustSec policy.

Explanation

Correct Answer

B:

EDR records malicious process behavior and isolation blocks lateral access. This is the targeted operational evidence for the change. Endpoint telemetry detects host behavior not visible in network perimeter logs. 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 supported stateful HA with synchronized policy and state. Stateless device redundancy may disrupt existing inspected sessions. 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 policy rule match and app identification logs before disabling IPS globally. One false positive calls for scoped tuning rather than removing all defense. 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: Define least-privilege SGT policy among functional groups. An unconstrained group matrix defeats group-based 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 657

A high-availability NGFW pair should preserve traffic when one firewall fails. How should the team implement the required behavior?

  1. Use supported stateful HA with synchronized policy and state.
  2. Adopt identity/device-aware zero-trust checks rather than location as sole authority.
  3. Add behavior-based endpoint detection controls.
  4. Restrict management-plane reachability and require strong authenticated transport.

Explanation

Correct Answer

A:

Stateless device redundancy may disrupt existing inspected sessions. The most direct remediation is use supported stateful HA with synchronized policy and state. A practical acceptance test is a controlled firewall failover retains permitted sessions where state sync is supported. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A new access policy trusts every device located on the office subnet. Physical network placement is not proof of device health or user entitlement. It does not specifically correct the issue here: a high-availability NGFW pair should preserve traffic when one firewall fails.

C:

This choice addresses a different situation: An endpoint defense policy checks only antivirus signatures and misses suspicious process trees. Modern endpoint security uses behavioral signals in addition to signature matching. It does not specifically correct the issue here: a high-availability NGFW pair should preserve traffic when one firewall fails.

D:

This choice addresses a different situation: An engineer exposes a management API to the internet with broad ACLs. Management interfaces should not be generally accessible from untrusted sources. It does not specifically correct the issue here: a high-availability NGFW pair should preserve traffic when one firewall fails.

Question 658

An operator has applied the following change: use supported stateful HA with synchronized policy and state. Which observation best confirms it works?

  1. An untrusted office-connected device remains denied despite local IP address.
  2. Threat telemetry records anomalous execution chains and triggers the response policy.
  3. Only approved management sources reach the API with valid identity.
  4. A controlled firewall failover retains permitted sessions where state sync is supported.

Explanation

Correct Answer

D:

A controlled firewall failover retains permitted sessions where state sync is supported. This is the targeted operational evidence for the change. Stateless device redundancy may disrupt existing inspected sessions. 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: Adopt identity/device-aware zero-trust checks rather than location as sole authority. Physical network placement is not proof of device health or user entitlement. 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: Add behavior-based endpoint detection controls. Modern endpoint security uses behavioral signals in addition to signature matching. 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: Restrict management-plane reachability and require strong authenticated transport. Management interfaces should not be generally accessible from untrusted sources. 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 659

A new access policy trusts every device located on the office subnet. What is the most appropriate corrective measure?

  1. Review policy rule match and app identification logs before disabling IPS globally.
  2. Define least-privilege SGT policy among functional groups.
  3. Adopt identity/device-aware zero-trust checks rather than location as sole authority.
  4. Use segmentation and endpoint containment policies between peer groups.

Explanation

Correct Answer

C:

Physical network placement is not proof of device health or user entitlement. The most direct remediation is adopt identity/device-aware zero-trust checks rather than location as sole authority. A practical acceptance test is an untrusted office-connected device remains denied despite local IP address. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A next-generation firewall blocks an application after an unexpected signature update. One false positive calls for scoped tuning rather than removing all defense. It does not specifically correct the issue here: a new access policy trusts every device located on the office subnet.

B:

This choice addresses a different situation: A campus segmentation plan uses one common allow-all SGT rule for every group. An unconstrained group matrix defeats group-based segmentation. It does not specifically correct the issue here: a new access policy trusts every device located on the office subnet.

D:

This choice addresses a different situation: A company needs to stop lateral movement between compromised desktops. Internal host-to-host restrictions limit the spread of a single compromise. It does not specifically correct the issue here: a new access policy trusts every device located on the office subnet.

Question 660

After implementing adopt identity/device-aware zero-trust checks rather than location as sole authority., which operational evidence should an engineer collect?

  1. The specific flow matches the documented exception while general inspection remains enabled.
  2. An untrusted office-connected device remains denied despite local IP address.
  3. Only approved group pairs show permitted counters in TrustSec policy.
  4. A test compromised endpoint cannot open prohibited peer-to-peer sessions.

Explanation

Correct Answer

B:

An untrusted office-connected device remains denied despite local IP address. This is the targeted operational evidence for the change. Physical network placement is not proof of device health or user entitlement. 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 policy rule match and app identification logs before disabling IPS globally. One false positive calls for scoped tuning rather than removing all defense. 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: Define least-privilege SGT policy among functional groups. An unconstrained group matrix defeats group-based 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.

D:

This observation validates another operation: Use segmentation and endpoint containment policies between peer groups. Internal host-to-host restrictions limit the spread of a single 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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