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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 47

Question 460

A preventive architecture review covers this situation: A global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of branches. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Review optical budgets, amplification and protection paths with transport engineers.
  2. Document provider VPN isolation, resiliency and route-import controls in service contracts.
  3. Maintain transport diversity and monitor per-path SLA probes before application steering changes.
  4. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.

Explanation

Correct Answer

B:

Document provider VPN isolation, resiliency and route-import controls in service contracts. This control targets the underlying design risk. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The follow-up acceptance check remains: Routes remain in the intended VPN and all authorized branches exchange routed traffic.

Incorrect Answers

A:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The repeat risk here is different: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. A directly relevant preventive control is: Document provider VPN isolation, resiliency and route-import controls in service contracts.

C:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The repeat risk here is different: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. A directly relevant preventive control is: Document provider VPN isolation, resiliency and route-import controls in service contracts.

D:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The repeat risk here is different: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. A directly relevant preventive control is: Document provider VPN isolation, resiliency and route-import controls in service contracts.

Question 461

A new campus or WAN review presents this constraint: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of 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. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.
  2. Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.
  3. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.
  4. Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.

Explanation

Correct Answer

D:

Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution. This action addresses the stated design problem. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. A practical confirmation is: Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

A:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The actual fault is governed by a different mechanism: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The needed response is: Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.

B:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The actual fault is governed by a different mechanism: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The needed response is: Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.

C:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The actual fault is governed by a different mechanism: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The needed response is: Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.

Question 462

For this Cisco ENSLD design case: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of branches. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.
  2. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  3. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.
  4. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.

Explanation

Correct Answer

A:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The correct engineering response is: Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution. The observable check is: Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

B:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The offered choice instead concerns a different principle: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. Those technical conditions are not interchangeable.

C:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The offered choice instead concerns a different principle: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. Those technical conditions are not interchangeable.

D:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. 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 463

During acceptance testing for this network design: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of branches. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.
  2. Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result.
  3. Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.
  4. Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

Explanation

Correct Answer

B:

Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.

Incorrect Answers

A:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. In the case being tested, a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The necessary acceptance evidence is: Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result.

C:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. In the case being tested, a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The necessary acceptance evidence is: Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result.

D:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. In the case being tested, a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The necessary acceptance evidence is: Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result.

Question 464

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of 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. Maintain transport diversity and monitor per-path SLA probes before application steering changes.
  2. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.
  3. Document provider VPN isolation, resiliency and route-import controls in service contracts. Apply the same control to the multimodal logistics WAN rollout checklist.
  4. Review optical budgets, amplification and protection paths with transport engineers.

Explanation

Correct Answer

C:

Document provider VPN isolation, resiliency and route-import controls in service contracts. Apply the same control to the multimodal logistics WAN rollout checklist. This control targets the underlying design risk. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The follow-up acceptance check remains: Routes remain in the intended VPN and all authorized branches exchange routed traffic. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

A:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The repeat risk here is different: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. A directly relevant preventive control is: Document provider VPN isolation, resiliency and route-import controls in service contracts. Apply the same control to the multimodal logistics WAN rollout checklist.

B:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The repeat risk here is different: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. A directly relevant preventive control is: Document provider VPN isolation, resiliency and route-import controls in service contracts. Apply the same control to the multimodal logistics WAN rollout checklist.

D:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The repeat risk here is different: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. A directly relevant preventive control is: Document provider VPN isolation, resiliency and route-import controls in service contracts. Apply the same control to the multimodal logistics WAN rollout checklist.

Question 465

A Cisco enterprise designer reviews the following scenario: A small metro campus wants cost-effective point-to-point Ethernet connectivity between nearby facilities. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.
  2. Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.
  3. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.
  4. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

Explanation

Correct Answer

A:

Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements. This action addresses the stated design problem. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. A practical confirmation is: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

Incorrect Answers

B:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The actual fault is governed by a different mechanism: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The needed response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.

C:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The actual fault is governed by a different mechanism: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The needed response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.

D:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The actual fault is governed by a different mechanism: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The needed response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.

Question 466

The network architecture board discusses the following: A small metro campus wants cost-effective point-to-point Ethernet connectivity between nearby facilities. Which technical principle BEST explains the design decision?

  1. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.
  2. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  3. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.
  4. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.

Explanation

Correct Answer

B:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The correct engineering response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements. The observable check is: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

Incorrect Answers

A:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The offered choice instead concerns a different principle: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. Those technical conditions are not interchangeable.

C:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The offered choice instead concerns a different principle: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. Those technical conditions are not interchangeable.

D:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The offered choice instead concerns a different principle: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. Those technical conditions are not interchangeable.

Question 467

The infrastructure team must validate this situation: A small metro campus wants cost-effective point-to-point Ethernet connectivity between nearby facilities. Which acceptance observation BEST establishes the intended result?

  1. Optical power, wavelength plans and end-to-end error rates meet the physical service design.
  2. The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.
  3. Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.
  4. The branch reaches critical services over cellular when the primary circuit is disconnected.

Explanation

Correct Answer

C:

Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.

Incorrect Answers

A:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. In the case being tested, Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The necessary acceptance evidence is: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

B:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. In the case being tested, Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The necessary acceptance evidence is: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. In the case being tested, Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The necessary acceptance evidence is: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

Question 468

A post-incident design review discusses the following: A small metro campus wants cost-effective point-to-point Ethernet connectivity between nearby facilities. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.
  2. Test cellular failover, authentication, signal quality and billing controls regularly.
  3. Review optical budgets, amplification and protection paths with transport engineers.
  4. Check demarcation handoff, VLAN tags and carrier SLA testing at activation.

Explanation

Correct Answer

D:

Check demarcation handoff, VLAN tags and carrier SLA testing at activation. This control targets the underlying design risk. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The follow-up acceptance check remains: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

Incorrect Answers

A:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The repeat risk here is different: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. A directly relevant preventive control is: Check demarcation handoff, VLAN tags and carrier SLA testing at activation.

B:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The repeat risk here is different: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. A directly relevant preventive control is: Check demarcation handoff, VLAN tags and carrier SLA testing at activation.

C:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The repeat risk here is different: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. A directly relevant preventive control is: Check demarcation handoff, VLAN tags and carrier SLA testing at activation.

Question 469

During a network design workshop, the team finds this issue: During a predeployment review for a coastal branch network, the team discovers this design gap: a small metro campus wants cost-effective point-to-point Ethernet connectivity between nearby facilities. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.
  2. Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.
  3. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.
  4. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

Explanation

Correct Answer

B:

Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements. This action addresses the stated design problem. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. A practical confirmation is: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile. The coastal branch network acceptance record also captures this result.

Incorrect Answers

A:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The actual fault is governed by a different mechanism: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The needed response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.

C:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The actual fault is governed by a different mechanism: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The needed response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.

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: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The needed response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.

Question 470

In a technical design review: During a predeployment review for a coastal branch network, the team discovers this design gap: a small metro campus wants cost-effective point-to-point Ethernet connectivity between nearby facilities. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.
  2. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.
  3. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  4. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.

Explanation

Correct Answer

C:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The correct engineering response is: Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements. The observable check is: Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile. The coastal branch network acceptance record also captures this result.

Incorrect Answers

A:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The offered choice instead concerns a different principle: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. Those technical conditions are not interchangeable.

B:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The offered choice instead concerns a different principle: a carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. Those technical conditions are not interchangeable.

D:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. 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.