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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 46

Question 450

The network architecture board discusses the following: Two data centers must exchange native Ethernet frames transparently between locations managed by one provider. Which technical principle BEST explains the design decision?

  1. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  2. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.
  3. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  4. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.

Explanation

Correct Answer

B:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The correct engineering response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement. The observable check is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Incorrect Answers

A:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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 Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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 451

The infrastructure team must validate this situation: Two data centers must exchange native Ethernet frames transparently between locations managed by one provider. Which acceptance observation BEST establishes the intended result?

  1. The branch reaches critical services over cellular when the primary circuit is disconnected.
  2. Routes remain in the intended VPN and all authorized branches exchange routed traffic.
  3. The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.
  4. Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

Explanation

Correct Answer

C:

The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.

Incorrect Answers

A:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. In the case being tested, a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The necessary acceptance evidence is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

B:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. In the case being tested, a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The necessary acceptance evidence is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

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 Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The necessary acceptance evidence is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Question 452

A post-incident design review discusses the following: Two data centers must exchange native Ethernet frames transparently between locations managed by one provider. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Check demarcation handoff, VLAN tags and carrier SLA testing at activation.
  2. Review optical budgets, amplification and protection paths with transport engineers.
  3. Document provider VPN isolation, resiliency and route-import controls in service contracts.
  4. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.

Explanation

Correct Answer

D:

Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities. This control targets the underlying design risk. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The follow-up acceptance check remains: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Incorrect Answers

A:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The repeat risk here is different: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A directly relevant preventive control is: Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.

B:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The repeat risk here is different: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A directly relevant preventive control is: Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.

C:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The repeat risk here is different: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A directly relevant preventive control is: Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.

Question 453

During a network design workshop, the team finds this issue: During a predeployment review for a financial firm WAN, the team discovers this design gap: two data centers must exchange native Ethernet frames transparently between locations managed by one provider. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.
  2. Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.
  3. Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.
  4. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

Explanation

Correct Answer

B:

Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement. This action addresses the stated design problem. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A practical confirmation is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

A:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The actual fault is governed by a different mechanism: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The needed response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

C:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The actual fault is governed by a different mechanism: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The needed response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

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: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The needed response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

Question 454

In a technical design review: During a predeployment review for a financial firm WAN, the team discovers this design gap: two data centers must exchange native Ethernet frames transparently between locations managed by one provider. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  2. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  3. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.
  4. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.

Explanation

Correct Answer

C:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The correct engineering response is: Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement. The observable check is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

A:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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.

B:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. 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.

Question 455

An engineering reviewer needs objective proof for the following: During a predeployment review for a financial firm WAN, the team discovers this design gap: two data centers must exchange native Ethernet frames transparently between locations managed by one provider. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

D:

The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. The financial firm WAN acceptance record also captures this result. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.

Incorrect Answers

A:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. In the case being tested, a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The necessary acceptance evidence is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. The financial firm WAN acceptance record also captures this result.

B:

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 Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The necessary acceptance evidence is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. The financial firm WAN acceptance record also captures this result.

C:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. In the case being tested, a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The necessary acceptance evidence is: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. The financial firm WAN acceptance record also captures this result.

Question 456

The change advisory board sees a repeat risk in this case: During a predeployment review for a financial firm WAN, the team discovers this design gap: two data centers must exchange native Ethernet frames transparently between locations managed by one provider. 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. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities. Apply the same control to the financial firm WAN rollout checklist.
  2. Document provider VPN isolation, resiliency and route-import controls in service contracts.
  3. Check demarcation handoff, VLAN tags and carrier SLA testing at activation.
  4. Maintain transport diversity and monitor per-path SLA probes before application steering changes.

Explanation

Correct Answer

A:

Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities. Apply the same control to the financial firm WAN rollout checklist. This control targets the underlying design risk. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. The follow-up acceptance check remains: The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold. The financial firm 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 repeat risk here is different: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A directly relevant preventive control is: Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities. Apply the same control to the financial firm WAN rollout checklist.

C:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The repeat risk here is different: a Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A directly relevant preventive control is: Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities. Apply the same control to the financial firm WAN rollout checklist.

D:

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 Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. A directly relevant preventive control is: Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities. Apply the same control to the financial firm WAN rollout checklist.

Question 457

A design team must resolve this enterprise network problem: A global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of branches. Which action MOST DIRECTLY meets the stated design requirement?

  1. Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.
  2. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.
  3. Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.
  4. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

Explanation

Correct Answer

C:

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.

Incorrect Answers

A:

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: 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:

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.

D:

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.

Question 458

The design record describes this issue: A global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of branches. Which technical principle BEST explains the design decision?

  1. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.
  2. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  3. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  4. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.

Explanation

Correct Answer

D:

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.

Incorrect Answers

A:

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.

B:

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.

C:

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

Question 459

After designing a change for the following scenario: A global enterprise needs provider-managed any-to-any routed private connectivity among hundreds of branches. Which acceptance observation BEST establishes the intended result?

  1. Routes remain in the intended VPN and all authorized branches exchange routed traffic.
  2. The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.
  3. Optical power, wavelength plans and end-to-end error rates meet the physical service design.
  4. Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.

Explanation

Correct Answer

A:

Routes remain in the intended VPN and all authorized branches exchange routed traffic. A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes.

Incorrect Answers

B:

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.

C:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. 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.

D:

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.

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.