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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 61

Question 600

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: a service provider link has excellent latency but intermittent packet loss, harming one critical SaaS application. 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. Calibrate measurement intervals and thresholds to avoid route flapping. Apply the same control to the financial firm WAN rollout checklist.
  2. Exercise controller and transit provider failures independently in the lab.
  3. Retest QoS after changing physical access speeds or encapsulation overhead.
  4. Include multicast join, leave and recovery exercises in overlay acceptance tests.

Explanation

Correct Answer

A:

Calibrate measurement intervals and thresholds to avoid route flapping. Apply the same control to the financial firm WAN rollout checklist. This control targets the underlying design risk. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The follow-up acceptance check remains: Test flows move to the healthy transport when configured SLA metrics are violated. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

B:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The repeat risk here is different: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. A directly relevant preventive control is: Calibrate measurement intervals and thresholds to avoid route flapping. Apply the same control to the financial firm WAN rollout checklist.

C:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The repeat risk here is different: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. A directly relevant preventive control is: Calibrate measurement intervals and thresholds to avoid route flapping. Apply the same control to the financial firm WAN rollout checklist.

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The repeat risk here is different: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. A directly relevant preventive control is: Calibrate measurement intervals and thresholds to avoid route flapping. Apply the same control to the financial firm WAN rollout checklist.

Question 601

A design team must resolve this enterprise network problem: An SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream provider. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.
  2. Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.
  3. Build redundant controller-reachability paths and test overlay recovery under provider isolation.
  4. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.

Explanation

Correct Answer

C:

Build redundant controller-reachability paths and test overlay recovery under provider isolation. This action addresses the stated design problem. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A practical confirmation is: Edges maintain or recover authorized policy and reachability after one provider is removed.

Incorrect Answers

A:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The actual fault is governed by a different mechanism: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The needed response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation.

B:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The actual fault is governed by a different mechanism: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The needed response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation.

D:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The actual fault is governed by a different mechanism: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The needed response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation.

Question 602

The design record describes this issue: An SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream provider. Which technical principle BEST explains the design decision?

  1. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works.
  2. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.
  3. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.
  4. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains.

Explanation

Correct Answer

D:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The correct engineering response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation. The observable check is: Edges maintain or recover authorized policy and reachability after one provider is removed.

Incorrect Answers

A:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The offered choice instead concerns a different principle: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. Those technical conditions are not interchangeable.

B:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The offered choice instead concerns a different principle: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. Those technical conditions are not interchangeable.

C:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. 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 603

After designing a change for the following scenario: An SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream provider. Which acceptance observation BEST establishes the intended result?

  1. Edges maintain or recover authorized policy and reachability after one provider is removed.
  2. Test flows move to the healthy transport when configured SLA metrics are violated.
  3. Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.
  4. A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

Explanation

Correct Answer

A:

Edges maintain or recover authorized policy and reachability after one provider is removed. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains.

Incorrect Answers

B:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. In the case being tested, Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The necessary acceptance evidence is: Edges maintain or recover authorized policy and reachability after one provider is removed.

C:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. In the case being tested, Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The necessary acceptance evidence is: Edges maintain or recover authorized policy and reachability after one provider is removed.

D:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. In the case being tested, Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The necessary acceptance evidence is: Edges maintain or recover authorized policy and reachability after one provider is removed.

Question 604

A preventive architecture review covers this situation: An SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream provider. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Track site and route growth forecasts against vendor support matrices.
  2. Exercise controller and transit provider failures independently in the lab.
  3. Calibrate measurement intervals and thresholds to avoid route flapping.
  4. Include multicast join, leave and recovery exercises in overlay acceptance tests.

Explanation

Correct Answer

B:

Exercise controller and transit provider failures independently in the lab. This control targets the underlying design risk. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The follow-up acceptance check remains: Edges maintain or recover authorized policy and reachability after one provider is removed.

Incorrect Answers

A:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The repeat risk here is different: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A directly relevant preventive control is: Exercise controller and transit provider failures independently in the lab.

C:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The repeat risk here is different: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A directly relevant preventive control is: Exercise controller and transit provider failures independently in the lab.

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The repeat risk here is different: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A directly relevant preventive control is: Exercise controller and transit provider failures independently in the lab.

Question 605

A new campus or WAN review presents this constraint: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: an SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream 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. Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.
  2. Assess controller, edge and policy scale against supported platform limits before expansion.
  3. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.
  4. Build redundant controller-reachability paths and test overlay recovery under provider isolation.

Explanation

Correct Answer

D:

Build redundant controller-reachability paths and test overlay recovery under provider isolation. This action addresses the stated design problem. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A practical confirmation is: Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

A:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The actual fault is governed by a different mechanism: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The needed response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation.

B:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The actual fault is governed by a different mechanism: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The needed response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation.

C:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The actual fault is governed by a different mechanism: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The needed response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation.

Question 606

For this Cisco ENSLD design case: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: an SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream provider. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains.
  2. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points.
  3. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.
  4. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works.

Explanation

Correct Answer

A:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The correct engineering response is: Build redundant controller-reachability paths and test overlay recovery under provider isolation. The observable check is: Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

B:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The offered choice instead concerns a different principle: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. Those technical conditions are not interchangeable.

C:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The offered choice instead concerns a different principle: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. Those technical conditions are not interchangeable.

D:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The offered choice instead concerns a different principle: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. Those technical conditions are not interchangeable.

Question 607

During acceptance testing for this network design: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: an SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream provider. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.
  2. Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result.
  3. A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.
  4. Test flows move to the healthy transport when configured SLA metrics are violated.

Explanation

Correct Answer

B:

Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains.

Incorrect Answers

A:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. In the case being tested, Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The necessary acceptance evidence is: Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result.

C:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. In the case being tested, Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The necessary acceptance evidence is: Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result.

D:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. In the case being tested, Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The necessary acceptance evidence is: Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result.

Question 608

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: an SD-WAN design uses both physical transports but places all control-plane reachability behind one failure-prone upstream 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. Track site and route growth forecasts against vendor support matrices.
  2. Calibrate measurement intervals and thresholds to avoid route flapping.
  3. Exercise controller and transit provider failures independently in the lab. Apply the same control to the multimodal logistics WAN rollout checklist.
  4. Retest QoS after changing physical access speeds or encapsulation overhead.

Explanation

Correct Answer

C:

Exercise controller and transit provider failures independently in the lab. Apply the same control to the multimodal logistics WAN rollout checklist. This control targets the underlying design risk. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The follow-up acceptance check remains: Edges maintain or recover authorized policy and reachability after one provider is removed. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

A:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The repeat risk here is different: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A directly relevant preventive control is: Exercise controller and transit provider failures independently in the lab. Apply the same control to the multimodal logistics WAN rollout checklist.

B:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The repeat risk here is different: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A directly relevant preventive control is: Exercise controller and transit provider failures independently in the lab. Apply the same control to the multimodal logistics WAN rollout checklist.

D:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The repeat risk here is different: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. A directly relevant preventive control is: Exercise controller and transit provider failures independently in the lab. Apply the same control to the multimodal logistics WAN rollout checklist.

Question 609

A Cisco enterprise designer reviews the following scenario: A branch sends real-time voice and large backups across the same constrained SD-WAN overlay. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.
  2. Assess controller, edge and policy scale against supported platform limits before expansion.
  3. Build redundant controller-reachability paths and test overlay recovery under provider isolation.
  4. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.

Explanation

Correct Answer

A:

Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data. This action addresses the stated design problem. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. A practical confirmation is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.

Incorrect Answers

B:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The actual fault is governed by a different mechanism: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The needed response is: Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.

C:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The actual fault is governed by a different mechanism: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The needed response is: Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The actual fault is governed by a different mechanism: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The needed response is: Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.

Question 610

The network architecture board discusses the following: A branch sends real-time voice and large backups across the same constrained SD-WAN overlay. Which technical principle BEST explains the design decision?

  1. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works.
  2. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points.
  3. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.
  4. DWDM multiplexes distinct optical wavelengths onto one fiber pair to increase transport capacity.

Explanation

Correct Answer

B:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The correct engineering response is: Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data. The observable check is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.

Incorrect Answers

A:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The offered choice instead concerns a different principle: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. Those technical conditions are not interchangeable.

C:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. 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.

D:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. 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.