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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 40

Question 390

During acceptance testing after restrict NTP peer access using appropriate access controls or authentication., which evidence is most relevant?

  1. Stratum falls to a synchronized value and reference time updates.
  2. Translation output shows the persistent mapping and external reachability.
  3. `show ip nat statistics` identifies correct interface roles and counters increase.
  4. Unauthorized NTP peers are denied and trusted sources still synchronize.

Explanation

Correct Answer

D:

Unauthorized NTP peers are denied and trusted sources still synchronize. This is the targeted operational evidence for the change. Unauthenticated unrestricted time sources can corrupt system timing. 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: Treat the time source as unsynchronized and restore upstream reference. Stratum 16 signals an unusable NTP time reference. 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: Configure a static inside-source NAT mapping for the server. Static NAT maintains a predictable inside-local to inside-global mapping. 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: Correct the NAT inside/outside interface roles. Source translation depends on matching directions and the inside/outside topology. 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 391

Logs show NTP stratum 16 and traffic is normal. What is the most appropriate corrective measure?

  1. Configure PAT overload against the correct public interface.
  2. Add the subnet to the NAT match ACL and verify route direction.
  3. Treat the time source as unsynchronized and restore upstream reference.
  4. Use overload where supported or expand the available global address pool.

Explanation

Correct Answer

C:

Stratum 16 signals an unusable NTP time reference. The most direct remediation is treat the time source as unsynchronized and restore upstream reference. A practical acceptance test is stratum falls to a synchronized value and reference time updates. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: Internal RFC1918 users share one public IPv4 address for outbound web. PAT uses transport port translations to share a public address. It does not specifically correct the issue here: logs show NTP stratum 16 and traffic is normal.

B:

This choice addresses a different situation: Outbound PAT works for some VLANs but a newly added subnet has no translation. Only packets matching the NAT rule are translated. It does not specifically correct the issue here: logs show NTP stratum 16 and traffic is normal.

D:

This choice addresses a different situation: A dynamic NAT pool is exhausted while many connections are opened. One-to-one dynamic mappings cannot support unlimited simultaneous inside hosts. It does not specifically correct the issue here: logs show NTP stratum 16 and traffic is normal.

Question 392

An operator has applied the following change: treat the time source as unsynchronized and restore upstream reference. Which observation best confirms it works?

  1. `show ip nat translations` shows many inside local addresses sharing one global IP.
  2. Stratum falls to a synchronized value and reference time updates.
  3. Translation entries appear for the new subnet without changing others.
  4. Active translations scale after the pool or overload change.

Explanation

Correct Answer

B:

Stratum falls to a synchronized value and reference time updates. This is the targeted operational evidence for the change. Stratum 16 signals an unusable NTP time reference. 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: Configure PAT overload against the correct public interface. PAT uses transport port translations to share a public address. 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 the subnet to the NAT match ACL and verify route direction. Only packets matching the NAT rule are translated. 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 overload where supported or expand the available global address pool. One-to-one dynamic mappings cannot support unlimited simultaneous inside hosts. 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 393

Internal RFC1918 users share one public IPv4 address for outbound web. Which action most directly addresses this situation?

  1. Configure PAT overload against the correct public interface.
  2. Configure a static inside-source NAT mapping for the server.
  3. Correct the NAT inside/outside interface roles.
  4. Configure a static TCP port forward to the server's private address and port.

Explanation

Correct Answer

A:

PAT uses transport port translations to share a public address. The most direct remediation is configure PAT overload against the correct public interface. A practical acceptance test is `show ip nat translations` shows many inside local addresses sharing one global IP. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A private internal server must be reachable at one fixed public address. Static NAT maintains a predictable inside-local to inside-global mapping. It does not specifically correct the issue here: internal RFC1918 users share one public IPv4 address for outbound web.

C:

This choice addresses a different situation: A NAT router designates the WAN interface as inside and LAN as outside. Source translation depends on matching directions and the inside/outside topology. It does not specifically correct the issue here: internal RFC1918 users share one public IPv4 address for outbound web.

D:

This choice addresses a different situation: An application server must publish TCP 443 through a PAT router. Static PAT maps a specific public transport socket to the internal service. It does not specifically correct the issue here: internal RFC1918 users share one public IPv4 address for outbound web.

Question 394

After implementing configure PAT overload against the correct public interface., which operational evidence should an engineer collect?

  1. Translation output shows the persistent mapping and external reachability.
  2. `show ip nat statistics` identifies correct interface roles and counters increase.
  3. Inbound TCP 443 reaches the intended inside local server and translation appears.
  4. `show ip nat translations` shows many inside local addresses sharing one global IP.

Explanation

Correct Answer

D:

`show ip nat translations` shows many inside local addresses sharing one global IP. This is the targeted operational evidence for the change. PAT uses transport port translations to share a public address. 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: Configure a static inside-source NAT mapping for the server. Static NAT maintains a predictable inside-local to inside-global mapping. 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: Correct the NAT inside/outside interface roles. Source translation depends on matching directions and the inside/outside topology. 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: Configure a static TCP port forward to the server's private address and port. Static PAT maps a specific public transport socket to the internal service. 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 395

A private internal server must be reachable at one fixed public address. What is the most effective configuration or design response?

  1. Add the subnet to the NAT match ACL and verify route direction.
  2. Use overload where supported or expand the available global address pool.
  3. Configure a static inside-source NAT mapping for the server.
  4. Make the NAT device a valid forwarding hop for matched traffic.

Explanation

Correct Answer

C:

Static NAT maintains a predictable inside-local to inside-global mapping. The most direct remediation is configure a static inside-source NAT mapping for the server. A practical acceptance test is translation output shows the persistent mapping and external reachability. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: Outbound PAT works for some VLANs but a newly added subnet has no translation. Only packets matching the NAT rule are translated. It does not specifically correct the issue here: a private internal server must be reachable at one fixed public address.

B:

This choice addresses a different situation: A dynamic NAT pool is exhausted while many connections are opened. One-to-one dynamic mappings cannot support unlimited simultaneous inside hosts. It does not specifically correct the issue here: a private internal server must be reachable at one fixed public address.

D:

This choice addresses a different situation: A NAT debug reports no translations because the client path bypasses the device. A NAT configuration cannot translate packets that never traverse its interfaces. It does not specifically correct the issue here: a private internal server must be reachable at one fixed public address.

Question 396

The change request says: configure a static inside-source NAT mapping for the server. Which verification result is most decisive?

  1. Translation entries appear for the new subnet without changing others.
  2. Translation output shows the persistent mapping and external reachability.
  3. Active translations scale after the pool or overload change.
  4. Packet capture shows the inside flow arriving and translated egress leaving.

Explanation

Correct Answer

B:

Translation output shows the persistent mapping and external reachability. This is the targeted operational evidence for the change. Static NAT maintains a predictable inside-local to inside-global mapping. 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: Add the subnet to the NAT match ACL and verify route direction. Only packets matching the NAT rule are translated. 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 overload where supported or expand the available global address pool. One-to-one dynamic mappings cannot support unlimited simultaneous inside hosts. 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: Make the NAT device a valid forwarding hop for matched traffic. A NAT configuration cannot translate packets that never traverse its interfaces. 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 397

Outbound PAT works for some VLANs but a newly added subnet has no translation. Which change should the network engineer prioritize?

  1. Add the subnet to the NAT match ACL and verify route direction.
  2. Correct the NAT inside/outside interface roles.
  3. Configure a static TCP port forward to the server's private address and port.
  4. Assess stateful NAT redundancy or application-level session recovery design.

Explanation

Correct Answer

A:

Only packets matching the NAT rule are translated. The most direct remediation is add the subnet to the NAT match ACL and verify route direction. A practical acceptance test is translation entries appear for the new subnet without changing others. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A NAT router designates the WAN interface as inside and LAN as outside. Source translation depends on matching directions and the inside/outside topology. It does not specifically correct the issue here: outbound PAT works for some VLANs but a newly added subnet has no translation.

C:

This choice addresses a different situation: An application server must publish TCP 443 through a PAT router. Static PAT maps a specific public transport socket to the internal service. It does not specifically correct the issue here: outbound PAT works for some VLANs but a newly added subnet has no translation.

D:

This choice addresses a different situation: Users lose NAT sessions during failover and want session continuity. A new router with no translation state cannot preserve existing PAT sessions automatically. It does not specifically correct the issue here: outbound PAT works for some VLANs but a newly added subnet has no translation.

Question 398

A post-change test follows this action: add the subnet to the NAT match ACL and verify route direction. Which result demonstrates success?

  1. `show ip nat statistics` identifies correct interface roles and counters increase.
  2. Inbound TCP 443 reaches the intended inside local server and translation appears.
  3. Failover testing shows either replicated translations or a documented reconnection process.
  4. Translation entries appear for the new subnet without changing others.

Explanation

Correct Answer

D:

Translation entries appear for the new subnet without changing others. This is the targeted operational evidence for the change. Only packets matching the NAT rule are translated. 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: Correct the NAT inside/outside interface roles. Source translation depends on matching directions and the inside/outside topology. 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: Configure a static TCP port forward to the server's private address and port. Static PAT maps a specific public transport socket to the internal service. 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: Assess stateful NAT redundancy or application-level session recovery design. A new router with no translation state cannot preserve existing PAT sessions automatically. 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 399

A NAT router designates the WAN interface as inside and LAN as outside. Which remediation best resolves the described symptom?

  1. Use overload where supported or expand the available global address pool.
  2. Make the NAT device a valid forwarding hop for matched traffic.
  3. Correct the NAT inside/outside interface roles.
  4. Verify outside-to-inside ACL and route reachability as well as NAT configuration.

Explanation

Correct Answer

C:

Source translation depends on matching directions and the inside/outside topology. The most direct remediation is correct the NAT inside/outside interface roles. A practical acceptance test is `show ip nat statistics` identifies correct interface roles and counters increase. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A dynamic NAT pool is exhausted while many connections are opened. One-to-one dynamic mappings cannot support unlimited simultaneous inside hosts. It does not specifically correct the issue here: a NAT router designates the WAN interface as inside and LAN as outside.

B:

This choice addresses a different situation: A NAT debug reports no translations because the client path bypasses the device. A NAT configuration cannot translate packets that never traverse its interfaces. It does not specifically correct the issue here: a NAT router designates the WAN interface as inside and LAN as outside.

D:

This choice addresses a different situation: A public service is inaccessible despite a static NAT entry. Translation alone does not override security filtering or return routing. It does not specifically correct the issue here: a NAT router designates the WAN interface as inside and LAN as outside.

Question 400

During acceptance testing after correct the NAT inside/outside interface roles., which evidence is most relevant?

  1. Active translations scale after the pool or overload change.
  2. `show ip nat statistics` identifies correct interface roles and counters increase.
  3. Packet capture shows the inside flow arriving and translated egress leaving.
  4. Permitted inbound packets are translated and response traffic returns through the NAT path.

Explanation

Correct Answer

B:

`show ip nat statistics` identifies correct interface roles and counters increase. This is the targeted operational evidence for the change. Source translation depends on matching directions and the inside/outside topology. 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 overload where supported or expand the available global address pool. One-to-one dynamic mappings cannot support unlimited simultaneous inside hosts. 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: Make the NAT device a valid forwarding hop for matched traffic. A NAT configuration cannot translate packets that never traverse its interfaces. 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: Verify outside-to-inside ACL and route reachability as well as NAT configuration. Translation alone does not override security filtering or return routing. 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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