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Cisco 300-410 Bundle

Exam Code: 300-410

Exam Name Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) (300-410) Practice Tests

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Cisco 300-410 Practice Test 73

Question 720

At the Southridge banking office, an IPv4 ACL on R-SRG-EDGE1 allows two explicit applications, but an otherwise legitimate management source loses connectivity after the ACL is applied. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review ACL type and placement against all affected routing paths.
  2. Trace packet direction through the router before attaching an ACL.
  3. Test approved and denied flows whenever extending production ACLs.
  4. Include IPv6 interface ACL attachment in dual-stack security change reviews.

Explanation

Correct Answer

C:

The safeguard follows the failure mechanism at the Southridge banking office. Test approved and denied flows whenever extending production ACLs.

Incorrect Answers

A:

This is useful for another concern: Review ACL type and placement against all affected routing paths. It does not continuously test ipv4 acl implicit deny at the Southridge banking office.

B:

This would manage a different failure pattern. The ACL attachment direction or interface does not intersect the targeted packet flow. It is not the most direct recurring check for ipv4 acl implicit deny at the Southridge banking office.

D:

This is useful for another concern: Include IPv6 interface ACL attachment in dual-stack security change reviews. It does not continuously test ipv4 acl implicit deny at the Southridge banking office.

Question 721

At the Westlake utility network, a standard IPv4 ACL intended to limit access to one destination is blocking the same source subnet's unrelated traffic on another network. Which continuing operational control is most directly relevant to preventing this problem?

  1. Check reverse-path expectations whenever multihoming changes asymmetry.
  2. Monitor time synchronization and scheduled ACL activity around maintenance windows.
  3. Verify representative boundary addresses whenever ACL wildcards are changed.
  4. Review ACL type and placement against all affected routing paths.

Explanation

Correct Answer

D:

The safeguard follows the failure mechanism at the Westlake utility network. Review ACL type and placement against all affected routing paths.

Incorrect Answers

A:

That safeguard protects against urpf strict in asymmetric topology, not the concrete risk described at the Westlake utility network. A standard IPv4 ACL matches source addresses, so placement can affect more destinations than intended.

B:

This is useful for another concern: Monitor time synchronization and scheduled ACL activity around maintenance windows. It does not continuously test standard acl source-only matching at the Westlake utility network.

C:

This would manage a different failure pattern. Wildcard bits determine which address positions are ignored, and the current value does not represent the intended network. It is not the most direct recurring check for standard acl source-only matching at the Westlake utility network.

Question 722

At the Pinecrest freight terminal, a standard IPv4 ACL intended to limit access to one destination is blocking the same source subnet's unrelated traffic on another network. Which continuing operational control is most directly relevant to preventing this problem?

  1. Trace packet direction through the router before attaching an ACL.
  2. Review anti-spoofing assurance levels against the chosen uRPF mode.
  3. Test approved and denied flows whenever extending production ACLs.
  4. Review ACL type and placement against all affected routing paths.

Explanation

Correct Answer

D:

This control monitors the relevant configuration or operational behavior at the Pinecrest freight terminal. Review ACL type and placement against all affected routing paths. It targets the condition described in the stem.

Incorrect Answers

A:

This would manage a different failure pattern. The ACL attachment direction or interface does not intersect the targeted packet flow. It is not the most direct recurring check for standard acl source-only matching at the Pinecrest freight terminal.

B:

That safeguard protects against urpf loose versus strict source check, not the concrete risk described at the Pinecrest freight terminal. A standard IPv4 ACL matches source addresses, so placement can affect more destinations than intended.

C:

This is useful for another concern: Test approved and denied flows whenever extending production ACLs. It does not continuously test standard acl source-only matching at the Pinecrest freight terminal.

Question 723

At the Cedarfield retail branch, R-CED-BR1 has an extended ACL with the intended source and destination criteria, but the undesired packets still pass because the ACL is applied outbound on an unrelated interface. Which continuing operational control is most directly relevant to preventing this problem?

  1. Test approved and denied flows whenever extending production ACLs.
  2. Include IPv6 interface ACL attachment in dual-stack security change reviews.
  3. Review anti-spoofing assurance levels against the chosen uRPF mode.
  4. Trace packet direction through the router before attaching an ACL.

Explanation

Correct Answer

D:

At the Cedarfield retail branch, this continuing check directly limits recurrence of the observed failure. Trace packet direction through the router before attaching an ACL. The underlying problem is: The ACL attachment direction or interface does not intersect the targeted packet flow.

Incorrect Answers

A:

This is useful for another concern: Test approved and denied flows whenever extending production ACLs. It does not continuously test extended acl inbound/outbound orientation at the Cedarfield retail branch.

B:

This would manage a different failure pattern. The IPv6 access-classification policy is not attached to the traffic ingress path being protected. It is not the most direct recurring check for extended acl inbound/outbound orientation at the Cedarfield retail branch.

C:

That safeguard protects against urpf loose versus strict source check, not the concrete risk described at the Cedarfield retail branch. The ACL attachment direction or interface does not intersect the targeted packet flow.

Question 724

At the Bluewater clinical network, R-BLU-PE1 has an extended ACL with the intended source and destination criteria, but the undesired packets still pass because the ACL is applied outbound on an unrelated interface. Which continuing operational control is most directly relevant to preventing this problem?

  1. Trace packet direction through the router before attaching an ACL.
  2. Review ACL type and placement against all affected routing paths.
  3. Check reverse-path expectations whenever multihoming changes asymmetry.
  4. Test approved and denied flows whenever extending production ACLs.

Explanation

Correct Answer

A:

The safeguard follows the failure mechanism at the Bluewater clinical network. Trace packet direction through the router before attaching an ACL.

Incorrect Answers

B:

This is useful for another concern: Review ACL type and placement against all affected routing paths. It does not continuously test extended acl inbound/outbound orientation at the Bluewater clinical network.

C:

This would manage a different failure pattern. Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source. It is not the most direct recurring check for extended acl inbound/outbound orientation at the Bluewater clinical network.

D:

That safeguard protects against ipv4 acl implicit deny, not the concrete risk described at the Bluewater clinical network. The ACL attachment direction or interface does not intersect the targeted packet flow.

Question 725

At the Harborview media campus, an ACL on R-HAR-DIST1 meant to cover 10.127.0.0/16 uses a wildcard mask that unintentionally matches only part of the permitted source range. Which continuing operational control is most directly relevant to preventing this problem?

  1. Verify representative boundary addresses whenever ACL wildcards are changed.
  2. Review ACL type and placement against all affected routing paths.
  3. Check reverse-path expectations whenever multihoming changes asymmetry.
  4. Include IPv6 interface ACL attachment in dual-stack security change reviews.

Explanation

Correct Answer

A:

This control monitors the relevant configuration or operational behavior at the Harborview media campus. Verify representative boundary addresses whenever ACL wildcards are changed. It targets the condition described in the stem.

Incorrect Answers

B:

That safeguard protects against standard acl source-only matching, not the concrete risk described at the Harborview media campus. Wildcard bits determine which address positions are ignored, and the current value does not represent the intended network.

C:

This is useful for another concern: Check reverse-path expectations whenever multihoming changes asymmetry. It does not continuously test ipv4 wildcard mask matching at the Harborview media campus.

D:

This would manage a different failure pattern. The IPv6 access-classification policy is not attached to the traffic ingress path being protected. It is not the most direct recurring check for ipv4 wildcard mask matching at the Harborview media campus.

Question 726

At the Ironwood training campus, an ACL on R-IRN-RT1 meant to cover 10.248.0.0/16 uses a wildcard mask that unintentionally matches only part of the permitted source range. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review anti-spoofing assurance levels against the chosen uRPF mode.
  2. Review ACL type and placement against all affected routing paths.
  3. Verify representative boundary addresses whenever ACL wildcards are changed.
  4. Include IPv6 interface ACL attachment in dual-stack security change reviews.

Explanation

Correct Answer

C:

The safeguard follows the failure mechanism at the Ironwood training campus. Verify representative boundary addresses whenever ACL wildcards are changed.

Incorrect Answers

A:

This is useful for another concern: Review anti-spoofing assurance levels against the chosen uRPF mode. It does not continuously test ipv4 wildcard mask matching at the Ironwood training campus.

B:

This would manage a different failure pattern. A standard IPv4 ACL matches source addresses, so placement can affect more destinations than intended. It is not the most direct recurring check for ipv4 wildcard mask matching at the Ironwood training campus.

D:

This is useful for another concern: Include IPv6 interface ACL attachment in dual-stack security change reviews. It does not continuously test ipv4 wildcard mask matching at the Ironwood training campus.

Question 727

At the Hillcrest research lab, a time-range ACL should permit contractor access during the approved maintenance window, but legitimate traffic remains denied despite a matching IP rule. Which continuing operational control is most directly relevant to preventing this problem?

  1. Monitor time synchronization and scheduled ACL activity around maintenance windows.
  2. Check reverse-path expectations whenever multihoming changes asymmetry.
  3. Include IPv6 interface ACL attachment in dual-stack security change reviews.
  4. Review ACL type and placement against all affected routing paths.

Explanation

Correct Answer

A:

The safeguard follows the failure mechanism at the Hillcrest research lab. Monitor time synchronization and scheduled ACL activity around maintenance windows.

Incorrect Answers

B:

This is useful for another concern: Check reverse-path expectations whenever multihoming changes asymmetry. It does not continuously test time-based acl inactive schedule at the Hillcrest research lab.

C:

This would manage a different failure pattern. The IPv6 access-classification policy is not attached to the traffic ingress path being protected. It is not the most direct recurring check for time-based acl inactive schedule at the Hillcrest research lab.

D:

That safeguard protects against standard acl source-only matching, not the concrete risk described at the Hillcrest research lab. The time-based ACL entry is inactive at the time packets arrive despite matching source and destination criteria.

Question 728

At the Northport logistics site, a time-range ACL should permit contractor access during the approved maintenance window, but legitimate traffic remains denied despite a matching IP rule. Which continuing operational control is most directly relevant to preventing this problem?

  1. Monitor time synchronization and scheduled ACL activity around maintenance windows.
  2. Test approved and denied flows whenever extending production ACLs.
  3. Review anti-spoofing assurance levels against the chosen uRPF mode.
  4. Check reverse-path expectations whenever multihoming changes asymmetry.

Explanation

Correct Answer

A:

This control monitors the relevant configuration or operational behavior at the Northport logistics site. Monitor time synchronization and scheduled ACL activity around maintenance windows. It targets the condition described in the stem.

Incorrect Answers

B:

That safeguard protects against ipv4 acl implicit deny, not the concrete risk described at the Northport logistics site. The time-based ACL entry is inactive at the time packets arrive despite matching source and destination criteria.

C:

This is useful for another concern: Review anti-spoofing assurance levels against the chosen uRPF mode. It does not continuously test time-based acl inactive schedule at the Northport logistics site.

D:

This would manage a different failure pattern. Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source. It is not the most direct recurring check for time-based acl inactive schedule at the Northport logistics site.

Question 729

At the Elmfield engineering office, an IPv6 traffic filter is configured to block unsolicited management connections but traffic still reaches R-ELM-EDGE1 over the IPv6-facing ingress link. Which continuing operational control is most directly relevant to preventing this problem?

  1. Verify representative boundary addresses whenever ACL wildcards are changed.
  2. Include IPv6 interface ACL attachment in dual-stack security change reviews.
  3. Check reverse-path expectations whenever multihoming changes asymmetry.
  4. Monitor time synchronization and scheduled ACL activity around maintenance windows.

Explanation

Correct Answer

B:

This control monitors the relevant configuration or operational behavior at the Elmfield engineering office. Include IPv6 interface ACL attachment in dual-stack security change reviews. It targets the condition described in the stem.

Incorrect Answers

A:

This is useful for another concern: Verify representative boundary addresses whenever ACL wildcards are changed. It does not continuously test ipv6 acl interface direction at the Elmfield engineering office.

C:

That safeguard protects against urpf strict in asymmetric topology, not the concrete risk described at the Elmfield engineering office. The IPv6 access-classification policy is not attached to the traffic ingress path being protected.

D:

This is useful for another concern: Monitor time synchronization and scheduled ACL activity around maintenance windows. It does not continuously test ipv6 acl interface direction at the Elmfield engineering office.

Question 730

At the Granite manufacturing plant, an IPv6 traffic filter is configured to block unsolicited management connections but traffic still reaches R-GRA-PE1 over the IPv6-facing ingress link. Which continuing operational control is most directly relevant to preventing this problem?

  1. Include IPv6 interface ACL attachment in dual-stack security change reviews.
  2. Verify representative boundary addresses whenever ACL wildcards are changed.
  3. Review anti-spoofing assurance levels against the chosen uRPF mode.
  4. Check reverse-path expectations whenever multihoming changes asymmetry.

Explanation

Correct Answer

A:

The safeguard follows the failure mechanism at the Granite manufacturing plant. Include IPv6 interface ACL attachment in dual-stack security change reviews.

Incorrect Answers

B:

This is useful for another concern: Verify representative boundary addresses whenever ACL wildcards are changed. It does not continuously test ipv6 acl interface direction at the Granite manufacturing plant.

C:

This would manage a different failure pattern. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface. It is not the most direct recurring check for ipv6 acl interface direction at the Granite manufacturing plant.

D:

That safeguard protects against urpf strict in asymmetric topology, not the concrete risk described at the Granite manufacturing plant. The IPv6 access-classification policy is not attached to the traffic ingress path being protected.