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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 62

Question 610

During acceptance testing after inspect class-map match/drop counters rather than enabling packet debug globally., which evidence is most relevant?

  1. BGP keepalives match the authorized routing class and session stays Established.
  2. The target IPv6 source is denied while unrelated IPv6 traffic follows its intended policy.
  3. SSH packets match deny while unrelated allowed TCP ports pass.
  4. A targeted CoPP exceed/drop counter rises during an isolated rate test while global packet debugging remains off.

Explanation

Correct Answer

D:

A targeted CoPP exceed/drop counter rises during an isolated rate test while global packet debugging remains off. This is the targeted operational evidence for the change. CoPP statistics provide targeted observation at lower overhead. 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 ACL/class-map identification for BGP TCP port 179. Control-plane classification errors can tear down routing 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.

B:

This observation validates another operation: Add a corresponding IPv6 ACL and apply it to the intended interface. IPv4 access lists do not automatically evaluate IPv6 packets. 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 an extended ACE matching protocol TCP and destination port 22. Extended ACLs can distinguish transport ports unlike standard source-only lists. 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 611

A control-plane policy accidentally classifies BGP keepalives into scavenger traffic. What is the most effective configuration or design response?

  1. Use reviewed ACL sequence changes and test match counters before broad rollout.
  2. Place a precise deny ACE before broader permit ACEs.
  3. Correct ACL/class-map identification for BGP TCP port 179.
  4. Reattach the ACL in the direction of the arriving packets.

Explanation

Correct Answer

C:

Control-plane classification errors can tear down routing sessions. The most direct remediation is correct ACL/class-map identification for BGP TCP port 179. A practical acceptance test is bGP keepalives match the authorized routing class and session stays Established. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An ACL change must be safe across many routers. Order-sensitive filters need staged verification to avoid outages. It does not specifically correct the issue here: a control-plane policy accidentally classifies BGP keepalives into scavenger traffic.

B:

This choice addresses a different situation: An ACL blocks a public source but still lets an unwanted private address through. ACLs evaluate entries in order and stop on first match. It does not specifically correct the issue here: a control-plane policy accidentally classifies BGP keepalives into scavenger traffic.

D:

This choice addresses a different situation: An access list is applied inbound on a WAN interface but only outgoing traffic is blocked. Interface ACL direction is relative to the router interface. It does not specifically correct the issue here: a control-plane policy accidentally classifies BGP keepalives into scavenger traffic.

Question 612

An operator has applied the following change: correct ACL/class-map identification for BGP TCP port 179. Which observation best confirms it works?

  1. A pilot router shows intended permit/deny matches before deployment expansion.
  2. BGP keepalives match the authorized routing class and session stays Established.
  3. The intended source increments deny counters and no later permit takes effect.
  4. `show ip interface` shows inbound attachment and ingress test packets are filtered.

Explanation

Correct Answer

B:

BGP keepalives match the authorized routing class and session stays Established. This is the targeted operational evidence for the change. Control-plane classification errors can tear down routing 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: Use reviewed ACL sequence changes and test match counters before broad rollout. Order-sensitive filters need staged verification to avoid outages. 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: Place a precise deny ACE before broader permit ACEs. ACLs evaluate entries in order and stop on first match. 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: Reattach the ACL in the direction of the arriving packets. Interface ACL direction is relative to the router interface. 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 613

An ACL change must be safe across many routers. Which change should the network engineer prioritize?

  1. Use reviewed ACL sequence changes and test match counters before broad rollout.
  2. Add a corresponding IPv6 ACL and apply it to the intended interface.
  3. Use an extended ACE matching protocol TCP and destination port 22.
  4. Place a source-only standard ACL near the destination where appropriate.

Explanation

Correct Answer

A:

Order-sensitive filters need staged verification to avoid outages. The most direct remediation is use reviewed ACL sequence changes and test match counters before broad rollout. A practical acceptance test is a pilot router shows intended permit/deny matches before deployment expansion. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A router blocks IPv4 transit traffic but permits IPv6 transit unexpectedly. IPv4 access lists do not automatically evaluate IPv6 packets. It does not specifically correct the issue here: an ACL change must be safe across many routers.

C:

This choice addresses a different situation: An extended ACL should block only TCP destination 22 rather than all IP. Extended ACLs can distinguish transport ports unlike standard source-only lists. It does not specifically correct the issue here: an ACL change must be safe across many routers.

D:

This choice addresses a different situation: A broad standard ACL on an upstream core blocks multiple unrelated destination services. Standard ACLs lack destination matching so broad placement can unintentionally affect other paths. It does not specifically correct the issue here: an ACL change must be safe across many routers.

Question 614

After implementing use reviewed ACL sequence changes and test match counters before broad rollout., which operational evidence should an engineer collect?

  1. The target IPv6 source is denied while unrelated IPv6 traffic follows its intended policy.
  2. SSH packets match deny while unrelated allowed TCP ports pass.
  3. Only traffic to the intended destination interface is filtered.
  4. A pilot router shows intended permit/deny matches before deployment expansion.

Explanation

Correct Answer

D:

A pilot router shows intended permit/deny matches before deployment expansion. This is the targeted operational evidence for the change. Order-sensitive filters need staged verification to avoid outages. 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 a corresponding IPv6 ACL and apply it to the intended interface. IPv4 access lists do not automatically evaluate IPv6 packets. 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 an extended ACE matching protocol TCP and destination port 22. Extended ACLs can distinguish transport ports unlike standard source-only lists. 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: Place a source-only standard ACL near the destination where appropriate. Standard ACLs lack destination matching so broad placement can unintentionally affect other paths. 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 615

A router blocks IPv4 transit traffic but permits IPv6 transit unexpectedly. Which remediation best resolves the described symptom?

  1. Place a precise deny ACE before broader permit ACEs.
  2. Reattach the ACL in the direction of the arriving packets.
  3. Add a corresponding IPv6 ACL and apply it to the intended interface.
  4. Account for the implicit deny and add explicit permitted traffic as needed.

Explanation

Correct Answer

C:

IPv4 access lists do not automatically evaluate IPv6 packets. The most direct remediation is add a corresponding IPv6 ACL and apply it to the intended interface. A practical acceptance test is the target IPv6 source is denied while unrelated IPv6 traffic follows its intended policy. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An ACL blocks a public source but still lets an unwanted private address through. ACLs evaluate entries in order and stop on first match. It does not specifically correct the issue here: a router blocks IPv4 transit traffic but permits IPv6 transit unexpectedly.

B:

This choice addresses a different situation: An access list is applied inbound on a WAN interface but only outgoing traffic is blocked. Interface ACL direction is relative to the router interface. It does not specifically correct the issue here: a router blocks IPv4 transit traffic but permits IPv6 transit unexpectedly.

D:

This choice addresses a different situation: An ACL ends without an explicit permit and legitimate packets disappear. Unmatched packets are discarded by an IP ACL. It does not specifically correct the issue here: a router blocks IPv4 transit traffic but permits IPv6 transit unexpectedly.

Question 616

The change request says: add a corresponding IPv6 ACL and apply it to the intended interface. Which verification result is most decisive?

  1. The intended source increments deny counters and no later permit takes effect.
  2. The target IPv6 source is denied while unrelated IPv6 traffic follows its intended policy.
  3. `show ip interface` shows inbound attachment and ingress test packets are filtered.
  4. A test permit ACE matches legitimate traffic while other packets remain denied.

Explanation

Correct Answer

B:

The target IPv6 source is denied while unrelated IPv6 traffic follows its intended policy. This is the targeted operational evidence for the change. IPv4 access lists do not automatically evaluate IPv6 packets. 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 a precise deny ACE before broader permit ACEs. ACLs evaluate entries in order and stop on first match. 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: Reattach the ACL in the direction of the arriving packets. Interface ACL direction is relative to the router interface. 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: Account for the implicit deny and add explicit permitted traffic as needed. Unmatched packets are discarded by an IP ACL. 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 617

An automation client calls a device API over HTTP with credentials. Which action most directly addresses this situation?

  1. Use HTTPS with verified server TLS certificates for REST API calls.
  2. Issue scoped least-privilege API credentials or role-bound tokens.
  3. Install a valid trust chain and keep hostname validation enabled.
  4. Require authentication and authorization before permitting REST writes.

Explanation

Correct Answer

A:

TLS protects credentials and payloads from passive interception and endpoint impersonation. The most direct remediation is use HTTPS with verified server TLS certificates for REST API calls. A practical acceptance test is capture shows TLS traffic and client validates the expected server identity. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

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: an automation client calls a device API over HTTP with credentials.

C:

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: an automation client calls a device API over HTTP with credentials.

D:

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 automation client calls a device API over HTTP with credentials.

Question 618

An operator has applied the following change: use HTTPS with verified server TLS certificates for REST API calls. Which observation best confirms it works?

  1. A token cannot perform an API operation outside its assigned role.
  2. The REST client succeeds only for a certificate matching its trusted authority and name.
  3. Anonymous modification is denied while authorized scoped identity succeeds.
  4. Capture shows TLS traffic and client validates the expected server identity.

Explanation

Correct Answer

D:

Capture shows TLS traffic and client validates the expected server identity. This is the targeted operational evidence for the change. TLS protects credentials and payloads from passive interception and endpoint 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: 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.

B:

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.

C:

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.

Question 619

An API integration uses one global administrator token for every maintenance script. What is the most effective configuration or design response?

  1. Remove and rotate the secret and move it to protected secret storage.
  2. Apply rate limits and monitoring to the API service.
  3. Issue scoped least-privilege API credentials or role-bound tokens.
  4. Enforce object-level access authorization in the API.

Explanation

Correct Answer

C:

Broad reusable tokens increase the blast radius of compromise. The most direct remediation is issue scoped least-privilege API credentials or role-bound tokens. A practical acceptance test is a token cannot perform an API operation outside its assigned role. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

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 API integration uses one global administrator token for every maintenance script.

B:

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 API integration uses one global administrator token for every maintenance script.

D:

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 API integration uses one global administrator token for every maintenance script.

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.

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