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Exam Code: 300-420

Exam Name Designing Cisco Enterprise Networks (ENSLD)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Cisco 300-420 Practice Test 58

Question 570

The design record describes this issue: An engineer describes the SD-WAN management GUI as the component that forwards user packets between branches. Which technical principle BEST explains the design decision?

  1. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.
  2. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.
  3. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.
  4. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.

Explanation

Correct Answer

D:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The correct engineering response is: Distinguish management functions from WAN edge data-plane forwarding in the architecture. The observable check is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.

Incorrect Answers

A:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The offered choice instead concerns a different principle: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. Those technical conditions are not interchangeable.

B:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The offered choice instead concerns a different principle: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. Those technical conditions are not interchangeable.

C:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The offered choice instead concerns a different principle: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. Those technical conditions are not interchangeable.

Question 571

After designing a change for the following scenario: An engineer describes the SD-WAN management GUI as the component that forwards user packets between branches. Which acceptance observation BEST establishes the intended result?

  1. Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.
  2. OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.
  3. A fresh edge registers successfully and establishes the expected authenticated controller connections.
  4. Tunnel security associations establish and captured transport traffic does not reveal protected payloads.

Explanation

Correct Answer

A:

Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.

Incorrect Answers

B:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. In the case being tested, SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The necessary acceptance evidence is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.

C:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. In the case being tested, SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The necessary acceptance evidence is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.

D:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. In the case being tested, SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The necessary acceptance evidence is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.

Question 572

A preventive architecture review covers this situation: An engineer describes the SD-WAN management GUI as the component that forwards user packets between branches. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Separately monitor OMP peering health and data-plane tunnel quality.
  2. Maintain separate management, orchestration, control and data-plane diagrams.
  3. Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.
  4. Include chassis, power and provider-path diversity in WAN high-availability reviews.

Explanation

Correct Answer

B:

Maintain separate management, orchestration, control and data-plane diagrams. This control targets the underlying design risk. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The follow-up acceptance check remains: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.

Incorrect Answers

A:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The repeat risk here is different: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. A directly relevant preventive control is: Maintain separate management, orchestration, control and data-plane diagrams.

C:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The repeat risk here is different: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. A directly relevant preventive control is: Maintain separate management, orchestration, control and data-plane diagrams.

D:

Two external circuits on one router still share a single customer edge hardware failure domain. The repeat risk here is different: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. A directly relevant preventive control is: Maintain separate management, orchestration, control and data-plane diagrams.

Question 573

A new campus or WAN review presents this constraint: During a predeployment review for a global retail WAN, the team discovers this design gap: an engineer describes the SD-WAN management GUI as the component that forwards user packets between branches. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.
  2. Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.
  3. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.
  4. Distinguish management functions from WAN edge data-plane forwarding in the architecture.

Explanation

Correct Answer

D:

Distinguish management functions from WAN edge data-plane forwarding in the architecture. This action addresses the stated design problem. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. A practical confirmation is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result.

Incorrect Answers

A:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The actual fault is governed by a different mechanism: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The needed response is: Distinguish management functions from WAN edge data-plane forwarding in the architecture.

B:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The actual fault is governed by a different mechanism: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The needed response is: Distinguish management functions from WAN edge data-plane forwarding in the architecture.

C:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The actual fault is governed by a different mechanism: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The needed response is: Distinguish management functions from WAN edge data-plane forwarding in the architecture.

Question 574

For this Cisco ENSLD design case: During a predeployment review for a global retail WAN, the team discovers this design gap: an engineer describes the SD-WAN management GUI as the component that forwards user packets between branches. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.
  2. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.
  3. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.
  4. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS.

Explanation

Correct Answer

A:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The correct engineering response is: Distinguish management functions from WAN edge data-plane forwarding in the architecture. The observable check is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result.

Incorrect Answers

B:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The offered choice instead concerns a different principle: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. Those technical conditions are not interchangeable.

C:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The offered choice instead concerns a different principle: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. Those technical conditions are not interchangeable.

D:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The offered choice instead concerns a different principle: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. Those technical conditions are not interchangeable.

Question 575

During acceptance testing for this network design: During a predeployment review for a global retail WAN, the team discovers this design gap: an engineer describes the SD-WAN management GUI as the component that forwards user packets between branches. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. A fresh edge registers successfully and establishes the expected authenticated controller connections.
  2. Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result.
  3. OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.
  4. Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

Explanation

Correct Answer

B:

Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.

Incorrect Answers

A:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. In the case being tested, SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The necessary acceptance evidence is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result.

C:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. In the case being tested, SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The necessary acceptance evidence is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result.

D:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. In the case being tested, SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The necessary acceptance evidence is: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result.

Question 576

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a global retail WAN, the team discovers this design gap: an engineer describes the SD-WAN management GUI as the component that forwards user packets between branches. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Separately monitor OMP peering health and data-plane tunnel quality.
  2. Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.
  3. Maintain separate management, orchestration, control and data-plane diagrams. Apply the same control to the global retail WAN rollout checklist.
  4. Review optical budgets, amplification and protection paths with transport engineers.

Explanation

Correct Answer

C:

Maintain separate management, orchestration, control and data-plane diagrams. Apply the same control to the global retail WAN rollout checklist. This control targets the underlying design risk. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The follow-up acceptance check remains: Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI. The global retail WAN acceptance record also captures this result.

Incorrect Answers

A:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The repeat risk here is different: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. A directly relevant preventive control is: Maintain separate management, orchestration, control and data-plane diagrams. Apply the same control to the global retail WAN rollout checklist.

B:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The repeat risk here is different: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. A directly relevant preventive control is: Maintain separate management, orchestration, control and data-plane diagrams. Apply the same control to the global retail WAN rollout checklist.

D:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The repeat risk here is different: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. A directly relevant preventive control is: Maintain separate management, orchestration, control and data-plane diagrams. Apply the same control to the global retail WAN rollout checklist.

Question 577

A Cisco enterprise designer reviews the following scenario: New Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. Which action MOST DIRECTLY meets the stated design requirement?

  1. Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.
  2. Distinguish management functions from WAN edge data-plane forwarding in the architecture.
  3. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.
  4. Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

Explanation

Correct Answer

A:

Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap. This action addresses the stated design problem. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. A practical confirmation is: A fresh edge registers successfully and establishes the expected authenticated controller connections.

Incorrect Answers

B:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The actual fault is governed by a different mechanism: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The needed response is: Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.

C:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The actual fault is governed by a different mechanism: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The needed response is: Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.

D:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The actual fault is governed by a different mechanism: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The needed response is: Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.

Question 578

The network architecture board discusses the following: New Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. Which technical principle BEST explains the design decision?

  1. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.
  2. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.
  3. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.
  4. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.

Explanation

Correct Answer

B:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The correct engineering response is: Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap. The observable check is: A fresh edge registers successfully and establishes the expected authenticated controller connections.

Incorrect Answers

A:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The offered choice instead concerns a different principle: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. Those technical conditions are not interchangeable.

C:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The offered choice instead concerns a different principle: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. Those technical conditions are not interchangeable.

D:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The offered choice instead concerns a different principle: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. Those technical conditions are not interchangeable.

Question 579

The infrastructure team must validate this situation: New Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. Which acceptance observation BEST establishes the intended result?

  1. Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.
  2. OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.
  3. A fresh edge registers successfully and establishes the expected authenticated controller connections.
  4. The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Explanation

Correct Answer

C:

A fresh edge registers successfully and establishes the expected authenticated controller connections. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.

Incorrect Answers

A:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. In the case being tested, Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The necessary acceptance evidence is: A fresh edge registers successfully and establishes the expected authenticated controller connections.

B:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. In the case being tested, Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The necessary acceptance evidence is: A fresh edge registers successfully and establishes the expected authenticated controller connections.

D:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. In the case being tested, Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The necessary acceptance evidence is: A fresh edge registers successfully and establishes the expected authenticated controller connections.

Question 580

A post-incident design review discusses the following: New Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Maintain separate management, orchestration, control and data-plane diagrams.
  2. Separately monitor OMP peering health and data-plane tunnel quality.
  3. Document provider VPN isolation, resiliency and route-import controls in service contracts.
  4. Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.

Explanation

Correct Answer

D:

Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment. This control targets the underlying design risk. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The follow-up acceptance check remains: A fresh edge registers successfully and establishes the expected authenticated controller connections.

Incorrect Answers

A:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The repeat risk here is different: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. A directly relevant preventive control is: Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.

B:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The repeat risk here is different: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. A directly relevant preventive control is: Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.

C:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The repeat risk here is different: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. A directly relevant preventive control is: Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.