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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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Cisco 300-410 Practice Test 34

Question 330

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 underlying technical condition best accounts for this evidence?

  1. The time-based ACL entry is inactive at the time packets arrive despite matching source and destination criteria.
  2. Packets that do not match an ACL permit statement are denied by the implicit final rule.
  3. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface.
  4. The IPv6 access-classification policy is not attached to the traffic ingress path being protected.

Explanation

Correct Answer

D:

The IPv6 access-classification policy is not attached to the traffic ingress path being protected. That explains the specific symptom at the Granite manufacturing plant. A direct corrective action is: Apply the IPv6 ACL to the correct routed interface and incoming direction.

Incorrect Answers

A:

This diagnoses a different mechanism: The time-based ACL entry is inactive at the time packets arrive despite matching source and destination criteria. The reported symptom at the Granite manufacturing plant instead concerns ipv6 acl interface direction.

B:

That diagnosis belongs to ipv4 acl implicit deny, while the observation at the Granite manufacturing plant points to ipv6 acl interface direction.

C:

The observation at the Granite manufacturing plant does not point to urpf loose versus strict source check; it points to a different condition. The IPv6 access-classification policy is not attached to the traffic ingress path being protected.

Question 331

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. Which underlying technical condition best accounts for this evidence?

  1. The ACL attachment direction or interface does not intersect the targeted packet flow.
  2. A standard IPv4 ACL matches source addresses, so placement can affect more destinations than intended.
  3. The time-based ACL entry is inactive at the time packets arrive despite matching source and destination criteria.
  4. Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source.

Explanation

Correct Answer

D:

The evidence at the Aspen agricultural office supports this condition: Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source. The associated fix is: Select a suitable source-validation mode and design that accounts for legitimate asymmetric paths.

Incorrect Answers

A:

The observation at the Aspen agricultural office does not point to extended acl inbound/outbound orientation; it points to a different condition. Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source.

B:

This diagnoses a different mechanism: A standard IPv4 ACL matches source addresses, so placement can affect more destinations than intended. The reported symptom at the Aspen agricultural office instead concerns urpf strict in asymmetric topology.

C:

That diagnosis belongs to time-based acl inactive schedule, while the observation at the Aspen agricultural office points to urpf strict in asymmetric topology.

Question 332

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. Which underlying technical condition best accounts for this evidence?

  1. Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source.
  2. Packets that do not match an ACL permit statement are denied by the implicit final rule.
  3. A standard IPv4 ACL matches source addresses, so placement can affect more destinations than intended.
  4. The ACL attachment direction or interface does not intersect the targeted packet flow.

Explanation

Correct Answer

A:

This diagnosis fits the symptoms at the Oakbridge insurance office. Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source. The remedial action is: Select a suitable source-validation mode and design that accounts for legitimate asymmetric paths.

Incorrect Answers

B:

The observation at the Oakbridge insurance office does not point to ipv4 acl implicit deny; it points to a different condition. Strict uRPF rejects packets whose incoming interface is not the router's reverse best path toward the source.

C:

This diagnoses a different mechanism: A standard IPv4 ACL matches source addresses, so placement can affect more destinations than intended. The reported symptom at the Oakbridge insurance office instead concerns urpf strict in asymmetric topology.

D:

That diagnosis belongs to extended acl inbound/outbound orientation, while the observation at the Oakbridge insurance office points to urpf strict in asymmetric topology.

Question 333

At the Redwood medical campus, administrators enable loose uRPF expecting to require every received packet to arrive on the best reverse-path interface. Which underlying technical condition best accounts for this evidence?

  1. The ACL attachment direction or interface does not intersect the targeted packet flow.
  2. The time-based ACL entry is inactive at the time packets arrive despite matching source and destination criteria.
  3. The IPv6 access-classification policy is not attached to the traffic ingress path being protected.
  4. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface.

Explanation

Correct Answer

D:

Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface. That explains the specific symptom at the Redwood medical campus. A direct corrective action is: Use strict uRPF where the topology supports it, or explicitly document loose-mode reachability-only validation.

Incorrect Answers

A:

This diagnoses a different mechanism: The ACL attachment direction or interface does not intersect the targeted packet flow. The reported symptom at the Redwood medical campus instead concerns urpf loose versus strict source check.

B:

That diagnosis belongs to time-based acl inactive schedule, while the observation at the Redwood medical campus points to urpf loose versus strict source check.

C:

The observation at the Redwood medical campus does not point to ipv6 acl interface direction; it points to a different condition. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface.

Question 334

At the Cedarbrook hospital, administrators enable loose uRPF expecting to require every received packet to arrive on the best reverse-path interface. Which underlying technical condition best accounts for this evidence?

  1. The time-based ACL entry is inactive at the time packets arrive despite matching source and destination criteria.
  2. Wildcard bits determine which address positions are ignored, and the current value does not represent the intended network.
  3. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface.
  4. The IPv6 access-classification policy is not attached to the traffic ingress path being protected.

Explanation

Correct Answer

C:

This diagnosis fits the symptoms at the Cedarbrook hospital. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface. The remedial action is: Use strict uRPF where the topology supports it, or explicitly document loose-mode reachability-only validation.

Incorrect Answers

A:

The observation at the Cedarbrook hospital does not point to time-based acl inactive schedule; it points to a different condition. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface.

B:

This diagnoses a different mechanism: Wildcard bits determine which address positions are ignored, and the current value does not represent the intended network. The reported symptom at the Cedarbrook hospital instead concerns urpf loose versus strict source check.

D:

The observation at the Cedarbrook hospital does not point to ipv6 acl interface direction; it points to a different condition. Loose uRPF checks that a source route exists, not that the packet came on the best reverse-path interface.

Question 335

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. Which underlying technical condition best accounts for this evidence?

  1. Authentication and authorization are active, but command-level accounting records are not being collected.
  2. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations.
  3. A restrictive control-plane policing class is discarding legitimate BGP packets.
  4. Forged neighbor advertisement information can poison IPv6 neighbor mappings on the LAN.

Explanation

Correct Answer

C:

A restrictive control-plane policing class is discarding legitimate BGP packets. That explains the specific symptom at the Bayview university campus. A direct corrective action is: Adjust the CoPP classification and authorized BGP control traffic rate according to measured demand and attack protection needs.

Incorrect Answers

A:

That diagnosis belongs to aaa accounting gaps, while the observation at the Bayview university campus points to copp control-plane bgp drops.

B:

The observation at the Bayview university campus does not point to copp management ssh rate-limiting; it points to a different condition. A restrictive control-plane policing class is discarding legitimate BGP packets.

D:

That diagnosis belongs to ipv6 neighbor discovery inspection, while the observation at the Bayview university campus points to copp control-plane bgp drops.

Question 336

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. Which underlying technical condition best accounts for this evidence?

  1. Authentication and authorization are active, but command-level accounting records are not being collected.
  2. A restrictive control-plane policing class is discarding legitimate BGP packets.
  3. The network is not enforcing a source IPv6 address-to-port binding for endpoint traffic.
  4. The control-plane classifier does not match OSPF packets as expected.

Explanation

Correct Answer

B:

This diagnosis fits the symptoms at the Clearwater library district. A restrictive control-plane policing class is discarding legitimate BGP packets. The remedial action is: Adjust the CoPP classification and authorized BGP control traffic rate according to measured demand and attack protection needs.

Incorrect Answers

A:

This diagnoses a different mechanism: Authentication and authorization are active, but command-level accounting records are not being collected. The reported symptom at the Clearwater library district instead concerns copp control-plane bgp drops.

C:

The observation at the Clearwater library district does not point to ipv6 source guard and bindings; it points to a different condition. A restrictive control-plane policing class is discarding legitimate BGP packets.

D:

This diagnoses a different mechanism: The control-plane classifier does not match OSPF packets as expected. The reported symptom at the Clearwater library district instead concerns copp control-plane bgp drops.

Question 337

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. Which underlying technical condition best accounts for this evidence?

  1. Forged neighbor advertisement information can poison IPv6 neighbor mappings on the LAN.
  2. A restrictive control-plane policing class is discarding legitimate BGP packets.
  3. An untrusted access device is sending RAs that change hosts' IPv6 default-router selection.
  4. The control-plane classifier does not match OSPF packets as expected.

Explanation

Correct Answer

D:

The evidence at the Highland government office supports this condition: The control-plane classifier does not match OSPF packets as expected. The associated fix is: Correct the control-plane class match to identify OSPF protocol 89 and keep its intended policy limits.

Incorrect Answers

A:

The observation at the Highland government office does not point to ipv6 neighbor discovery inspection; it points to a different condition. The control-plane classifier does not match OSPF packets as expected.

B:

This diagnoses a different mechanism: A restrictive control-plane policing class is discarding legitimate BGP packets. The reported symptom at the Highland government office instead concerns copp protocol classification error.

C:

That diagnosis belongs to ipv6 rogue router advertisement, while the observation at the Highland government office points to copp protocol classification error.

Question 338

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. Which underlying technical condition best accounts for this evidence?

  1. The network is not enforcing a source IPv6 address-to-port binding for endpoint traffic.
  2. The control-plane classifier does not match OSPF packets as expected.
  3. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations.
  4. A rogue DHCPv6 responder can influence hosts even when router advertisements are controlled separately.

Explanation

Correct Answer

B:

The evidence at the Foothill municipal site supports this condition: The control-plane classifier does not match OSPF packets as expected. The associated fix is: Correct the control-plane class match to identify OSPF protocol 89 and keep its intended policy limits.

Incorrect Answers

A:

That diagnosis belongs to ipv6 source guard and bindings, while the observation at the Foothill municipal site points to copp protocol classification error.

C:

This diagnoses a different mechanism: A too-small management control-plane policer drops permitted SSH traffic during ordinary operations. The reported symptom at the Foothill municipal site instead concerns copp protocol classification error.

D:

That diagnosis belongs to ipv6 dhcpv6 guard, while the observation at the Foothill municipal site points to copp protocol classification error.

Question 339

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. Which underlying technical condition best accounts for this evidence?

  1. Forged neighbor advertisement information can poison IPv6 neighbor mappings on the LAN.
  2. A restrictive control-plane policing class is discarding legitimate BGP packets.
  3. A rogue DHCPv6 responder can influence hosts even when router advertisements are controlled separately.
  4. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations.

Explanation

Correct Answer

D:

A too-small management control-plane policer drops permitted SSH traffic during ordinary operations. That explains the specific symptom at the Silverstream data center. A direct corrective action is: Tune the SSH-management CoPP class for the legitimate approved workload without removing protective rate limits.

Incorrect Answers

A:

This diagnoses a different mechanism: Forged neighbor advertisement information can poison IPv6 neighbor mappings on the LAN. The reported symptom at the Silverstream data center instead concerns copp management ssh rate-limiting.

B:

That diagnosis belongs to copp control-plane bgp drops, while the observation at the Silverstream data center points to copp management ssh rate-limiting.

C:

The observation at the Silverstream data center does not point to ipv6 dhcpv6 guard; it points to a different condition. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations.

Question 340

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. Which underlying technical condition best accounts for this evidence?

  1. The network is not enforcing a source IPv6 address-to-port binding for endpoint traffic.
  2. The control-plane classifier does not match OSPF packets as expected.
  3. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations.
  4. An untrusted access device is sending RAs that change hosts' IPv6 default-router selection.

Explanation

Correct Answer

C:

This diagnosis fits the symptoms at the Brookstone distribution branch. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations. The remedial action is: Tune the SSH-management CoPP class for the legitimate approved workload without removing protective rate limits.

Incorrect Answers

A:

The observation at the Brookstone distribution branch does not point to ipv6 source guard and bindings; it points to a different condition. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations.

B:

This diagnoses a different mechanism: The control-plane classifier does not match OSPF packets as expected. The reported symptom at the Brookstone distribution branch instead concerns copp management ssh rate-limiting.

D:

The observation at the Brookstone distribution branch does not point to ipv6 rogue router advertisement; it points to a different condition. A too-small management control-plane policer drops permitted SSH traffic during ordinary operations.