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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 48

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.

Question 471

An engineering reviewer needs objective proof for the following: 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 acceptance observation BEST establishes the intended result?

  1. Optical power, wavelength plans and end-to-end error rates meet the physical service design.
  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. 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.

Explanation

Correct Answer

D:

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. 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. The coastal branch network 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, 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. The coastal branch network 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, 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. The coastal branch network acceptance record also captures this result.

Question 472

The change advisory board sees a repeat risk in this case: 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 preventive design control MOST DIRECTLY addresses this specific risk?

  1. Check demarcation handoff, VLAN tags and carrier SLA testing at activation. Apply the same control to the coastal branch network rollout checklist.
  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. Maintain transport diversity and monitor per-path SLA probes before application steering changes.

Explanation

Correct Answer

A:

Check demarcation handoff, VLAN tags and carrier SLA testing at activation. Apply the same control to the coastal branch network rollout checklist. 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. The coastal branch network acceptance record also captures this result.

Incorrect Answers

B:

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. Apply the same control to the coastal branch network rollout checklist.

C:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. 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. Apply the same control to the coastal branch network 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: 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. Apply the same control to the coastal branch network rollout checklist.

Question 473

A design team must resolve this enterprise network problem: A carrier needs many high-capacity optical channels across a long-haul fiber span. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.
  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. Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.

Explanation

Correct Answer

C:

Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol. This action addresses the stated design problem. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A practical confirmation is: Optical power, wavelength plans and end-to-end error rates meet the physical service design.

Incorrect Answers

A:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The actual fault is governed by a different mechanism: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The needed response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

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: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The needed response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

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: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The needed response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

Question 474

The design record describes this issue: A carrier needs many high-capacity optical channels across a long-haul fiber span. Which technical principle BEST explains the design decision?

  1. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  2. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  3. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.
  4. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.

Explanation

Correct Answer

D:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The correct engineering response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol. The observable check is: Optical power, wavelength plans and end-to-end error rates meet the physical service design.

Incorrect Answers

A:

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

B:

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

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

Question 475

After designing a change for the following scenario: A carrier needs many high-capacity optical channels across a long-haul fiber span. 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. Routes remain in the intended VPN and all authorized branches exchange routed traffic.
  3. The branch reaches critical services over cellular when the primary circuit is disconnected.
  4. The prescribed VLAN or pseudowire traffic crosses both sites and MTU requirements hold.

Explanation

Correct Answer

A:

Optical power, wavelength plans and end-to-end error rates meet the physical service design. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.

Incorrect Answers

B:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. In the case being tested, DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The necessary acceptance evidence is: Optical power, wavelength plans and end-to-end error rates meet the physical service design.

C:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. In the case being tested, DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The necessary acceptance evidence is: Optical power, wavelength plans and end-to-end error rates meet the physical service design.

D:

A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes. In the case being tested, DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The necessary acceptance evidence is: Optical power, wavelength plans and end-to-end error rates meet the physical service design.

Question 476

A preventive architecture review covers this situation: A carrier needs many high-capacity optical channels across a long-haul fiber span. 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. Maintain transport diversity and monitor per-path SLA probes before application steering changes.

Explanation

Correct Answer

B:

Review optical budgets, amplification and protection paths with transport engineers. This control targets the underlying design risk. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The follow-up acceptance check remains: Optical power, wavelength plans and end-to-end error rates meet the physical service design.

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: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A directly relevant preventive control is: Review optical budgets, amplification and protection paths with transport engineers.

C:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The repeat risk here is different: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A directly relevant preventive control is: Review optical budgets, amplification and protection paths with transport engineers.

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: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A directly relevant preventive control is: Review optical budgets, amplification and protection paths with transport engineers.

Question 477

A new campus or WAN review presents this constraint: During a predeployment review for a global retail WAN, the team discovers this design gap: a carrier needs many high-capacity optical channels across a long-haul fiber span. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.
  3. Ensure the approved orchestrator/controller discovery and certificate trust path is available during bootstrap.
  4. Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

Explanation

Correct Answer

D:

Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol. This action addresses the stated design problem. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A practical confirmation is: Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail WAN 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 actual fault is governed by a different mechanism: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The needed response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

B:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The actual fault is governed by a different mechanism: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The needed response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

C:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The actual fault is governed by a different mechanism: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The needed response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol.

Question 478

For this Cisco ENSLD design case: During a predeployment review for a global retail WAN, the team discovers this design gap: a carrier needs many high-capacity optical channels across a long-haul fiber span. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.
  2. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  3. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.
  4. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.

Explanation

Correct Answer

A:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The correct engineering response is: Consider a DWDM transport design with appropriate optical engineering rather than treating each wavelength as a new IP routing protocol. The observable check is: Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail WAN acceptance record also captures this result.

Incorrect Answers

B:

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

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

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. 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 479

During acceptance testing for this network design: During a predeployment review for a global retail WAN, the team discovers this design gap: a carrier needs many high-capacity optical channels across a long-haul fiber span. 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. Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail WAN acceptance record also captures this result.
  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

B:

Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail WAN acceptance record also captures this result. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.

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, DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The necessary acceptance evidence is: Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail 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, DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The necessary acceptance evidence is: Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail WAN acceptance record also captures this result.

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. In the case being tested, DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The necessary acceptance evidence is: Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail WAN acceptance record also captures this result.

Question 480

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a global retail WAN, the team discovers this design gap: a carrier needs many high-capacity optical channels across a long-haul fiber span. 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. Check demarcation handoff, VLAN tags and carrier SLA testing at activation.
  2. Document provider VPN isolation, resiliency and route-import controls in service contracts.
  3. Review optical budgets, amplification and protection paths with transport engineers. Apply the same control to the global retail WAN rollout checklist.
  4. Minimize unnecessary stretched broadcast domains and document loop-prevention responsibilities.

Explanation

Correct Answer

C:

Review optical budgets, amplification and protection paths with transport engineers. Apply the same control to the global retail WAN rollout checklist. This control targets the underlying design risk. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The follow-up acceptance check remains: Optical power, wavelength plans and end-to-end error rates meet the physical service design. The global retail WAN 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 repeat risk here is different: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A directly relevant preventive control is: Review optical budgets, amplification and protection paths with transport engineers. Apply the same control to the global retail WAN rollout checklist.

B:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The repeat risk here is different: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A directly relevant preventive control is: Review optical budgets, amplification and protection paths with transport engineers. Apply the same control to the global retail WAN rollout checklist.

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: DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. A directly relevant preventive control is: Review optical budgets, amplification and protection paths with transport engineers. Apply the same control to the global retail WAN rollout checklist.