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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 54

Question 530

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. After remediation, which observation would most directly demonstrate the intended result?

  1. Addresses inside the approved range match while adjacent unauthorized ranges do not.
  2. Counters increment on the matching deny entry and the disallowed application flow is blocked.
  3. Authorized IPv6 management sources reach the device and disallowed attempts increment deny counters.
  4. Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered.

Explanation

Correct Answer

C:

This tests the exact behavior that was failing at the Granite manufacturing plant. Authorized IPv6 management sources reach the device and disallowed attempts increment deny counters. The change supporting that outcome is: Apply the IPv6 ACL to the correct routed interface and incoming direction.

Incorrect Answers

A:

That test could pass while the specific fault remains. Addresses inside the approved range match while adjacent unauthorized ranges do not. It would not establish the required outcome for ipv6 acl interface direction at the Granite manufacturing plant.

B:

The result addresses extended acl inbound/outbound orientation, not the observed fault at the Granite manufacturing plant. The decisive outcome is different: Authorized IPv6 management sources reach the device and disallowed attempts increment deny counters.

D:

That test could pass while the specific fault remains. Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered. It would not establish the required outcome for ipv6 acl interface direction at the Granite manufacturing plant.

Question 531

At the Aspen agricultural office, valid return traffic arrives over a secondary WAN circuit and is dropped by strict uRPF because the best route to its source points to the primary circuit. After remediation, which observation would most directly demonstrate the intended result?

  1. Tests distinguish unreachable spoofed sources from reachable sources arriving over alternate paths.
  2. Addresses inside the approved range match while adjacent unauthorized ranges do not.
  3. Counters increment on the matching deny entry and the disallowed application flow is blocked.
  4. Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered.

Explanation

Correct Answer

D:

This tests the exact behavior that was failing at the Aspen agricultural office. Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered. The change supporting that outcome is: Select a suitable source-validation mode and design that accounts for legitimate asymmetric paths.

Incorrect Answers

A:

This validates an unrelated control at the Aspen agricultural office: Tests distinguish unreachable spoofed sources from reachable sources arriving over alternate paths. It would not demonstrate correction of urpf strict in asymmetric topology.

B:

That test could pass while the specific fault remains. Addresses inside the approved range match while adjacent unauthorized ranges do not. It would not establish the required outcome for urpf strict in asymmetric topology at the Aspen agricultural office.

C:

The result addresses extended acl inbound/outbound orientation, not the observed fault at the Aspen agricultural office. The decisive outcome is different: Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered.

Question 532

At the Oakbridge insurance office, valid return traffic arrives over a secondary WAN circuit and is dropped by strict uRPF because the best route to its source points to the primary circuit. After remediation, which observation would most directly demonstrate the intended result?

  1. Authorized IPv6 management sources reach the device and disallowed attempts increment deny counters.
  2. The permit takes effect only during the intended window according to a synchronized clock.
  3. Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered.
  4. Addresses inside the approved range match while adjacent unauthorized ranges do not.

Explanation

Correct Answer

C:

A meaningful acceptance check at the Oakbridge insurance office should verify the actual forwarding or control-plane outcome. Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered.

Incorrect Answers

A:

The result addresses ipv6 acl interface direction, not the observed fault at the Oakbridge insurance office. The decisive outcome is different: Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered.

B:

This validates an unrelated control at the Oakbridge insurance office: The permit takes effect only during the intended window according to a synchronized clock. It would not demonstrate correction of urpf strict in asymmetric topology.

D:

The result addresses ipv4 wildcard mask matching, not the observed fault at the Oakbridge insurance office. The decisive outcome is different: Legitimate asymmetric traffic passes under the approved anti-spoofing design while forged sources remain filtered.

Question 533

At the Redwood medical campus, administrators enable loose uRPF expecting to require every received packet to arrive on the best reverse-path interface. After remediation, which observation would most directly demonstrate the intended result?

  1. Addresses inside the approved range match while adjacent unauthorized ranges do not.
  2. Tests distinguish unreachable spoofed sources from reachable sources arriving over alternate paths.
  3. Only the designated destination is restricted while unrelated paths from the same source remain usable.
  4. Counters increment on the matching deny entry and the disallowed application flow is blocked.

Explanation

Correct Answer

B:

The stated result demonstrates that the specific condition at the Redwood medical campus has been corrected. Tests distinguish unreachable spoofed sources from reachable sources arriving over alternate paths.

Incorrect Answers

A:

That test could pass while the specific fault remains. Addresses inside the approved range match while adjacent unauthorized ranges do not. It would not establish the required outcome for urpf loose versus strict source check at the Redwood medical campus.

C:

This validates an unrelated control at the Redwood medical campus: Only the designated destination is restricted while unrelated paths from the same source remain usable. It would not demonstrate correction of urpf loose versus strict source check.

D:

That test could pass while the specific fault remains. Counters increment on the matching deny entry and the disallowed application flow is blocked. It would not establish the required outcome for urpf loose versus strict source check at the Redwood medical campus.

Question 534

At the Cedarbrook hospital, administrators enable loose uRPF expecting to require every received packet to arrive on the best reverse-path interface. After remediation, which observation would most directly demonstrate the intended result?

  1. Tests distinguish unreachable spoofed sources from reachable sources arriving over alternate paths.
  2. Only the designated destination is restricted while unrelated paths from the same source remain usable.
  3. Counters increment on the matching deny entry and the disallowed application flow is blocked.
  4. The permit takes effect only during the intended window according to a synchronized clock.

Explanation

Correct Answer

A:

This tests the exact behavior that was failing at the Cedarbrook hospital. Tests distinguish unreachable spoofed sources from reachable sources arriving over alternate paths. The change supporting that outcome is: Use strict uRPF where the topology supports it, or explicitly document loose-mode reachability-only validation.

Incorrect Answers

B:

That test could pass while the specific fault remains. Only the designated destination is restricted while unrelated paths from the same source remain usable. It would not establish the required outcome for urpf loose versus strict source check at the Cedarbrook hospital.

C:

The result addresses extended acl inbound/outbound orientation, not the observed fault at the Cedarbrook hospital. The decisive outcome is different: Tests distinguish unreachable spoofed sources from reachable sources arriving over alternate paths.

D:

This validates an unrelated control at the Cedarbrook hospital: The permit takes effect only during the intended window according to a synchronized clock. It would not demonstrate correction of urpf loose versus strict source check.

Question 535

At the Bayview university campus, BGP TCP sessions flap during traffic bursts, while interface drops stay low; R-BAY-DIST1 shows CoPP drops in the class carrying BGP control traffic. After remediation, which observation would most directly demonstrate the intended result?

  1. Spoofed ND information is rejected and legitimate neighbor reachability remains stable.
  2. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.
  3. Packets with authorized bound source addresses pass while spoofed sources are dropped.
  4. BGP sessions remain stable under normal load and the CoPP counters no longer show legitimate BGP loss.

Explanation

Correct Answer

D:

The stated result demonstrates that the specific condition at the Bayview university campus has been corrected. BGP sessions remain stable under normal load and the CoPP counters no longer show legitimate BGP loss.

Incorrect Answers

A:

The result addresses ipv6 neighbor discovery inspection, not the observed fault at the Bayview university campus. The decisive outcome is different: BGP sessions remain stable under normal load and the CoPP counters no longer show legitimate BGP loss.

B:

This validates an unrelated control at the Bayview university campus: CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss. It would not demonstrate correction of copp control-plane bgp drops.

C:

That test could pass while the specific fault remains. Packets with authorized bound source addresses pass while spoofed sources are dropped. It would not establish the required outcome for copp control-plane bgp drops at the Bayview university campus.

Question 536

At the Clearwater library district, BGP TCP sessions flap during traffic bursts, while interface drops stay low; R-CLW-EDGE1 shows CoPP drops in the class carrying BGP control traffic. After remediation, which observation would most directly demonstrate the intended result?

  1. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.
  2. BGP sessions remain stable under normal load and the CoPP counters no longer show legitimate BGP loss.
  3. Automated SSH sessions complete at the required rate while abusive traffic still triggers protection.
  4. The test command produces an attributable record with identity, action and time at the accounting service.

Explanation

Correct Answer

B:

The stated result demonstrates that the specific condition at the Clearwater library district has been corrected. BGP sessions remain stable under normal load and the CoPP counters no longer show legitimate BGP loss.

Incorrect Answers

A:

That test could pass while the specific fault remains. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss. It would not establish the required outcome for copp control-plane bgp drops at the Clearwater library district.

C:

This validates an unrelated control at the Clearwater library district: Automated SSH sessions complete at the required rate while abusive traffic still triggers protection. It would not demonstrate correction of copp control-plane bgp drops.

D:

That test could pass while the specific fault remains. The test command produces an attributable record with identity, action and time at the accounting service. It would not establish the required outcome for copp control-plane bgp drops at the Clearwater library district.

Question 537

At the Highland government office, R-HIG-RT1 needs to protect OSPF control packets, but the CoPP class map matches the wrong IP protocol number and fails to account for legitimate OSPF packets. After remediation, which observation would most directly demonstrate the intended result?

  1. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.
  2. Packets with authorized bound source addresses pass while spoofed sources are dropped.
  3. A rogue RA is blocked at the access switch while authorized router advertisements continue.
  4. The test command produces an attributable record with identity, action and time at the accounting service.

Explanation

Correct Answer

A:

This tests the exact behavior that was failing at the Highland government office. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss. The change supporting that outcome is: Correct the control-plane class match to identify OSPF protocol 89 and keep its intended policy limits.

Incorrect Answers

B:

That test could pass while the specific fault remains. Packets with authorized bound source addresses pass while spoofed sources are dropped. It would not establish the required outcome for copp protocol classification error at the Highland government office.

C:

The result addresses ipv6 rogue router advertisement, not the observed fault at the Highland government office. The decisive outcome is different: CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.

D:

This validates an unrelated control at the Highland government office: The test command produces an attributable record with identity, action and time at the accounting service. It would not demonstrate correction of copp protocol classification error.

Question 538

At the Foothill municipal site, R-FOO-DIST1 needs to protect OSPF control packets, but the CoPP class map matches the wrong IP protocol number and fails to account for legitimate OSPF packets. After remediation, which observation would most directly demonstrate the intended result?

  1. Unauthorized DHCPv6 replies are blocked while approved DHCPv6 service remains available.
  2. Packets with authorized bound source addresses pass while spoofed sources are dropped.
  3. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.
  4. BGP sessions remain stable under normal load and the CoPP counters no longer show legitimate BGP loss.

Explanation

Correct Answer

C:

A meaningful acceptance check at the Foothill municipal site should verify the actual forwarding or control-plane outcome. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.

Incorrect Answers

A:

The result addresses ipv6 dhcpv6 guard, not the observed fault at the Foothill municipal site. The decisive outcome is different: CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.

B:

This validates an unrelated control at the Foothill municipal site: Packets with authorized bound source addresses pass while spoofed sources are dropped. It would not demonstrate correction of copp protocol classification error.

D:

The result addresses copp control-plane bgp drops, not the observed fault at the Foothill municipal site. The decisive outcome is different: CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.

Question 539

At the Silverstream data center, authorized SSH sessions to R-SIL-PE1 fail intermittently during routine automation runs, and the CoPP management class shows sustained packet drops. After remediation, which observation would most directly demonstrate the intended result?

  1. Spoofed ND information is rejected and legitimate neighbor reachability remains stable.
  2. BGP sessions remain stable under normal load and the CoPP counters no longer show legitimate BGP loss.
  3. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.
  4. Automated SSH sessions complete at the required rate while abusive traffic still triggers protection.

Explanation

Correct Answer

D:

A meaningful acceptance check at the Silverstream data center should verify the actual forwarding or control-plane outcome. Automated SSH sessions complete at the required rate while abusive traffic still triggers protection.

Incorrect Answers

A:

That test could pass while the specific fault remains. Spoofed ND information is rejected and legitimate neighbor reachability remains stable. It would not establish the required outcome for copp management ssh rate-limiting at the Silverstream data center.

B:

The result addresses copp control-plane bgp drops, not the observed fault at the Silverstream data center. The decisive outcome is different: Automated SSH sessions complete at the required rate while abusive traffic still triggers protection.

C:

This validates an unrelated control at the Silverstream data center: CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss. It would not demonstrate correction of copp management ssh rate-limiting.

Question 540

At the Brookstone distribution branch, authorized SSH sessions to R-BRK-EDGE1 fail intermittently during routine automation runs, and the CoPP management class shows sustained packet drops. After remediation, which observation would most directly demonstrate the intended result?

  1. CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss.
  2. Automated SSH sessions complete at the required rate while abusive traffic still triggers protection.
  3. A rogue RA is blocked at the access switch while authorized router advertisements continue.
  4. The test command produces an attributable record with identity, action and time at the accounting service.

Explanation

Correct Answer

B:

A meaningful acceptance check at the Brookstone distribution branch should verify the actual forwarding or control-plane outcome. Automated SSH sessions complete at the required rate while abusive traffic still triggers protection.

Incorrect Answers

A:

This validates an unrelated control at the Brookstone distribution branch: CoPP counters rise in the OSPF class during protocol activity without undesired adjacency loss. It would not demonstrate correction of copp management ssh rate-limiting.

C:

The result addresses ipv6 rogue router advertisement, not the observed fault at the Brookstone distribution branch. The decisive outcome is different: Automated SSH sessions complete at the required rate while abusive traffic still triggers protection.

D:

This validates an unrelated control at the Brookstone distribution branch: The test command produces an attributable record with identity, action and time at the accounting service. It would not demonstrate correction of copp management ssh rate-limiting.