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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 59

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.

Question 581

During a network design workshop, the team finds this issue: During a predeployment review for a manufacturing group WAN, the team discovers this design gap: new Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Distinguish management functions from WAN edge data-plane forwarding in the architecture.
  2. Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.
  3. Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.
  4. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

Explanation

Correct Answer

B:

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. The manufacturing group WAN acceptance record also captures this result.

Incorrect Answers

A:

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:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. 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:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. 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 582

In a technical design review: During a predeployment review for a manufacturing group WAN, the team discovers this design gap: new Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. 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. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  3. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.
  4. Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries.

Explanation

Correct Answer

C:

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. The manufacturing group WAN acceptance record also captures this result.

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.

B:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The offered choice instead concerns a different principle: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. 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: Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. Those technical conditions are not interchangeable.

Question 583

An engineering reviewer needs objective proof for the following: During a predeployment review for a manufacturing group WAN, the team discovers this design gap: new Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Tunnel security associations establish and captured transport traffic does not reveal protected payloads.
  4. A fresh edge registers successfully and establishes the expected authenticated controller connections. The manufacturing group WAN acceptance record also captures this result.

Explanation

Correct Answer

D:

A fresh edge registers successfully and establishes the expected authenticated controller connections. The manufacturing group WAN acceptance record also captures this result. 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. The manufacturing group WAN acceptance record also captures this result.

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. The manufacturing group WAN acceptance record also captures this result.

C:

IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. 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. The manufacturing group WAN acceptance record also captures this result.

Question 584

The change advisory board sees a repeat risk in this case: During a predeployment review for a manufacturing group WAN, the team discovers this design gap: new Cisco SD-WAN edges cannot discover required controllers during initial secure onboarding. 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. Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment. Apply the same control to the manufacturing group WAN rollout checklist.
  2. Maintain separate management, orchestration, control and data-plane diagrams.
  3. Separately monitor OMP peering health and data-plane tunnel quality.
  4. Test cellular failover, authentication, signal quality and billing controls regularly.

Explanation

Correct Answer

A:

Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment. Apply the same control to the manufacturing group WAN rollout checklist. 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. The manufacturing group WAN acceptance record also captures this result.

Incorrect Answers

B:

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. Apply the same control to the manufacturing group WAN rollout checklist.

C:

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. Apply the same control to the manufacturing group WAN rollout checklist.

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. 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. Apply the same control to the manufacturing group WAN rollout checklist.

Question 585

A design team must resolve this enterprise network problem: A Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. Which action MOST DIRECTLY meets the stated design requirement?

  1. Distinguish management functions from WAN edge data-plane forwarding in the architecture.
  2. Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.
  3. Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.
  4. Use separate redundant edge devices and verify upstream termination diversity.

Explanation

Correct Answer

C:

Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane. This action addresses the stated design problem. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A practical confirmation is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.

Incorrect Answers

A:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The actual fault is governed by a different mechanism: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The needed response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

B:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The actual fault is governed by a different mechanism: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The needed response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

D:

Two external circuits on one router still share a single customer edge hardware failure domain. The actual fault is governed by a different mechanism: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The needed response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

Question 586

The design record describes this issue: A Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. Which technical principle BEST explains the design decision?

  1. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.
  2. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.
  3. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  4. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.

Explanation

Correct Answer

D:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The correct engineering response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane. The observable check is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.

Incorrect Answers

A:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. 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:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. 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:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The offered choice instead concerns a different principle: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. Those technical conditions are not interchangeable.

Question 587

After designing a change for the following scenario: A Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. Which acceptance observation BEST establishes the intended result?

  1. OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.
  2. Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.
  3. A fresh edge registers successfully and establishes the expected authenticated controller connections.
  4. Test flows move to the healthy transport when configured SLA metrics are violated.

Explanation

Correct Answer

A:

OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.

Incorrect Answers

B:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. In the case being tested, the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The necessary acceptance evidence is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.

C:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. In the case being tested, the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The necessary acceptance evidence is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.

D:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. In the case being tested, the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The necessary acceptance evidence is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.

Question 588

A preventive architecture review covers this situation: A Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.
  2. Separately monitor OMP peering health and data-plane tunnel quality.
  3. Maintain separate management, orchestration, control and data-plane diagrams.
  4. Test cellular failover, authentication, signal quality and billing controls regularly.

Explanation

Correct Answer

B:

Separately monitor OMP peering health and data-plane tunnel quality. This control targets the underlying design risk. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The follow-up acceptance check remains: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels.

Incorrect Answers

A:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The repeat risk here is different: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A directly relevant preventive control is: Separately monitor OMP peering health and data-plane tunnel quality.

C:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The repeat risk here is different: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A directly relevant preventive control is: Separately monitor OMP peering health and data-plane tunnel quality.

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The repeat risk here is different: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A directly relevant preventive control is: Separately monitor OMP peering health and data-plane tunnel quality.

Question 589

A new campus or WAN review presents this constraint: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: a Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Add encryption if confidentiality is required rather than assuming a Layer 2 pseudowire is intrinsically encrypted.
  3. Add a diverse second access circuit and suitable edge failover to eliminate the single access-link fault domain.
  4. Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

Explanation

Correct Answer

D:

Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane. This action addresses the stated design problem. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A practical confirmation is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.

Incorrect Answers

A:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The actual fault is governed by a different mechanism: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The needed response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

B:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. The actual fault is governed by a different mechanism: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The needed response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

C:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. The actual fault is governed by a different mechanism: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The needed response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.

Question 590

For this Cisco ENSLD design case: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: a Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.
  2. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.
  3. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.
  4. Two external circuits on one router still share a single customer edge hardware failure domain.

Explanation

Correct Answer

A:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The correct engineering response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane. The observable check is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.

Incorrect Answers

B:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. 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:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. 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:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The offered choice instead concerns a different principle: Two external circuits on one router still share a single customer edge hardware failure domain. Those technical conditions are not interchangeable.