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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 49

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.

Question 481

A Cisco enterprise designer reviews the following scenario: A branch must remain online during wired circuit repair and has reliable mobile-network reception. 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. Select a provider Layer 2 VPN service if spanning Layer 2 domains is a documented requirement.
  3. Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.
  4. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

Explanation

Correct Answer

A:

Use a policy-controlled 4G/5G backup path with tested failover and data-use limits. This action addresses the stated design problem. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A practical confirmation is: The branch reaches critical services over cellular when the primary circuit is disconnected.

Incorrect Answers

B:

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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The needed response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

C:

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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The needed response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The needed response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

Question 482

The network architecture board discusses the following: A branch must remain online during wired circuit repair and has reliable mobile-network reception. 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. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  4. A Layer 2 VPN transports customer Layer 2 frames without making the carrier manage customer Layer 3 routes.

Explanation

Correct Answer

B:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The correct engineering response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits. The observable check is: The branch reaches critical services over cellular when the primary circuit is disconnected.

Incorrect Answers

A:

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

C:

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

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. 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 483

The infrastructure team must validate this situation: A branch must remain online during wired circuit repair and has reliable mobile-network reception. 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. Frames cross the subscribed point-to-point EVC within the agreed throughput and loss profile.
  3. The branch reaches critical services over cellular when the primary circuit is disconnected.
  4. Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

Explanation

Correct Answer

C:

The branch reaches critical services over cellular when the primary circuit is disconnected. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.

Incorrect Answers

A:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. In the case being tested, Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The necessary acceptance evidence is: The branch reaches critical services over cellular when the primary circuit is disconnected.

B:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. In the case being tested, Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The necessary acceptance evidence is: The branch reaches critical services over cellular when the primary circuit is disconnected.

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, Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The necessary acceptance evidence is: The branch reaches critical services over cellular when the primary circuit is disconnected.

Question 484

A post-incident design review discusses the following: A branch must remain online during wired circuit repair and has reliable mobile-network reception. 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. Maintain transport diversity and monitor per-path SLA probes before application steering changes.
  4. Test cellular failover, authentication, signal quality and billing controls regularly.

Explanation

Correct Answer

D:

Test cellular failover, authentication, signal quality and billing controls regularly. This control targets the underlying design risk. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The follow-up acceptance check remains: The branch reaches critical services over cellular when the primary circuit is disconnected.

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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A directly relevant preventive control is: Test cellular failover, authentication, signal quality and billing controls regularly.

B:

DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity. The repeat risk here is different: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A directly relevant preventive control is: Test cellular failover, authentication, signal quality and billing controls regularly.

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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A directly relevant preventive control is: Test cellular failover, authentication, signal quality and billing controls regularly.

Question 485

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: a branch must remain online during wired circuit repair and has reliable mobile-network reception. 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. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.
  3. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.
  4. Evaluate an MPLS Layer 3 VPN service with the provider managing VPN route distribution.

Explanation

Correct Answer

B:

Use a policy-controlled 4G/5G backup path with tested failover and data-use limits. This action addresses the stated design problem. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A practical confirmation is: The branch reaches critical services over cellular when the primary circuit is disconnected. The manufacturing group 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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The needed response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

C:

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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The needed response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

D:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The actual fault is governed by a different mechanism: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The needed response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.

Question 486

In a technical design review: During a predeployment review for a manufacturing group WAN, the team discovers this design gap: a branch must remain online during wired circuit repair and has reliable mobile-network reception. 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. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.
  3. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  4. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.

Explanation

Correct Answer

C:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The correct engineering response is: Use a policy-controlled 4G/5G backup path with tested failover and data-use limits. The observable check is: The branch reaches critical services over cellular when the primary circuit is disconnected. The manufacturing group WAN acceptance record also captures this result.

Incorrect Answers

A:

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

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

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The offered choice instead concerns a different principle: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. Those technical conditions are not interchangeable.

Question 487

An engineering reviewer needs objective proof for the following: During a predeployment review for a manufacturing group WAN, the team discovers this design gap: a branch must remain online during wired circuit repair and has reliable mobile-network reception. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.
  2. Routes remain in the intended VPN and all authorized branches exchange routed traffic.
  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. The manufacturing group WAN acceptance record also captures this result.

Explanation

Correct Answer

D:

The branch reaches critical services over cellular when the primary circuit is disconnected. The manufacturing group WAN acceptance record also captures this result. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.

Incorrect Answers

A:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. In the case being tested, Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The necessary acceptance evidence is: The branch reaches critical services over cellular when the primary circuit is disconnected. The manufacturing group WAN acceptance record also captures this result.

B:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. In the case being tested, Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The necessary acceptance evidence is: The branch reaches critical services over cellular when the primary circuit is disconnected. The manufacturing group 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, Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The necessary acceptance evidence is: The branch reaches critical services over cellular when the primary circuit is disconnected. The manufacturing group WAN acceptance record also captures this result.

Question 488

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: a branch must remain online during wired circuit repair and has reliable mobile-network reception. 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. Test cellular failover, authentication, signal quality and billing controls regularly. Apply the same control to the manufacturing group WAN rollout checklist.
  2. Check demarcation handoff, VLAN tags and carrier SLA testing at activation.
  3. Maintain transport diversity and monitor per-path SLA probes before application steering changes.
  4. Document provider VPN isolation, resiliency and route-import controls in service contracts.

Explanation

Correct Answer

A:

Test cellular failover, authentication, signal quality and billing controls regularly. Apply the same control to the manufacturing group WAN rollout checklist. This control targets the underlying design risk. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The follow-up acceptance check remains: The branch reaches critical services over cellular when the primary circuit is disconnected. The manufacturing group WAN acceptance record also captures this result.

Incorrect Answers

B:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The repeat risk here is different: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A directly relevant preventive control is: Test cellular failover, authentication, signal quality and billing controls regularly. Apply the same control to the manufacturing group WAN rollout checklist.

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: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A directly relevant preventive control is: Test cellular failover, authentication, signal quality and billing controls regularly. Apply the same control to the manufacturing group WAN rollout checklist.

D:

A carrier MPLS L3VPN separates customer routing via provider VRFs and distributes eligible customer prefixes. The repeat risk here is different: Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. A directly relevant preventive control is: Test cellular failover, authentication, signal quality and billing controls regularly. Apply the same control to the manufacturing group WAN rollout checklist.

Question 489

A design team must resolve this enterprise network problem: An enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. 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. Use a policy-controlled 4G/5G backup path with tested failover and data-use limits.
  3. Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.
  4. Evaluate DMVPN with NHRP registration and a supported multipoint GRE/IPsec design.

Explanation

Correct Answer

C:

Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits. This action addresses the stated design problem. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. A practical confirmation is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

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: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The needed response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

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: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The needed response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

D:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. The actual fault is governed by a different mechanism: an SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The needed response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits.

Question 490

The design record describes this issue: An enterprise installs SD-WAN CPE at sites connected to multiple commodity transports and needs application-aware path selection. 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. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.
  3. Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints.
  4. An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays.

Explanation

Correct Answer

D:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. The correct engineering response is: Place SD-WAN WAN-edge devices at the transport demarcations and design overlay policies for available circuits. The observable check is: Application flows follow intended paths and fail over to healthy TLOCs when an underlay degrades.

Incorrect Answers

A:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. 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.

B:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. 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:

An SD-WAN edge participates in encrypted overlays and uses controller-distributed policy to steer traffic over eligible underlays. 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.