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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 60

Question 590

For this Cisco ENSLD design case: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: a Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.
  2. SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets.
  3. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.
  4. Two external circuits on one router still share a single customer edge hardware failure domain.

Explanation

Correct Answer

A:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The correct engineering response is: Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane. The observable check is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.

Incorrect Answers

B:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The offered choice instead concerns a different principle: SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. Those technical conditions are not interchangeable.

C:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. 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.

D:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The offered choice instead concerns a different principle: Two external circuits on one router still share a single customer edge hardware failure domain. Those technical conditions are not interchangeable.

Question 591

During acceptance testing for this network design: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: a Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Configuration changes reach the correct edges but production packets are observed through WAN-edge tunnels rather than the management UI.
  2. OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.
  3. A fresh edge registers successfully and establishes the expected authenticated controller connections.
  4. A packet capture on an untrusted transport path shows only protected payload where encryption is mandated.

Explanation

Correct Answer

B:

OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself.

Incorrect Answers

A:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. In the case being tested, the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The necessary acceptance evidence is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.

C:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. In the case being tested, the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The necessary acceptance evidence is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.

D:

Layer 2 VPN isolation is distinct from end-to-end payload encryption and depends on carrier trust boundaries. In the case being tested, the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The necessary acceptance evidence is: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.

Question 592

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a regional healthcare WAN, the team discovers this design gap: a Cisco SD-WAN rollout expects OMP to carry end-user packets between sites. 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. Document bootstrap DNS, permitted ports and certificate lifecycle before site shipment.
  2. Maintain separate management, orchestration, control and data-plane diagrams.
  3. Separately monitor OMP peering health and data-plane tunnel quality. Apply the same control to the regional healthcare WAN rollout checklist.
  4. Test cellular failover, authentication, signal quality and billing controls regularly.

Explanation

Correct Answer

C:

Separately monitor OMP peering health and data-plane tunnel quality. Apply the same control to the regional healthcare WAN rollout checklist. This control targets the underlying design risk. The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. The follow-up acceptance check remains: OMP routes are present as expected and application captures show traffic in WAN-edge data tunnels. The regional healthcare WAN acceptance record also captures this result.

Incorrect Answers

A:

Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. The repeat risk here is different: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A directly relevant preventive control is: Separately monitor OMP peering health and data-plane tunnel quality. Apply the same control to the regional healthcare WAN rollout checklist.

B:

SD-WAN management centralizes configuration and visibility, while WAN edges forward application packets. The repeat risk here is different: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A directly relevant preventive control is: Separately monitor OMP peering health and data-plane tunnel quality. Apply the same control to the regional healthcare WAN rollout checklist.

D:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The repeat risk here is different: the SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. A directly relevant preventive control is: Separately monitor OMP peering health and data-plane tunnel quality. Apply the same control to the regional healthcare WAN rollout checklist.

Question 593

A Cisco enterprise designer reviews the following scenario: A service provider link has excellent latency but intermittent packet loss, harming one critical SaaS application. 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. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.
  3. Assess controller, edge and policy scale against supported platform limits before expansion.
  4. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.

Explanation

Correct Answer

A:

Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application. This action addresses the stated design problem. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. A practical confirmation is: Test flows move to the healthy transport when configured SLA metrics are violated.

Incorrect Answers

B:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The actual fault is governed by a different mechanism: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The needed response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.

C:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The actual fault is governed by a different mechanism: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The needed response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.

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: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The needed response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.

Question 594

The network architecture board discusses the following: A service provider link has excellent latency but intermittent packet loss, harming one critical SaaS application. Which technical principle BEST explains the design decision?

  1. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.
  2. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.
  3. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains.
  4. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points.

Explanation

Correct Answer

B:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The correct engineering response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application. The observable check is: Test flows move to the healthy transport when configured SLA metrics are violated.

Incorrect Answers

A:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. 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:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The offered choice instead concerns a different principle: Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. Those technical conditions are not interchangeable.

D:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. 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.

Question 595

The infrastructure team must validate this situation: A service provider link has excellent latency but intermittent packet loss, harming one critical SaaS application. 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.
  3. Test flows move to the healthy transport when configured SLA metrics are violated.
  4. A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

Explanation

Correct Answer

C:

Test flows move to the healthy transport when configured SLA metrics are violated. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.

Incorrect Answers

A:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. In the case being tested, SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The necessary acceptance evidence is: Test flows move to the healthy transport when configured SLA metrics are violated.

B:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. In the case being tested, SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The necessary acceptance evidence is: Test flows move to the healthy transport when configured SLA metrics are violated.

D:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. In the case being tested, SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The necessary acceptance evidence is: Test flows move to the healthy transport when configured SLA metrics are violated.

Question 596

A post-incident design review discusses the following: A service provider link has excellent latency but intermittent packet loss, harming one critical SaaS application. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Exercise controller and transit provider failures independently in the lab.
  2. Track site and route growth forecasts against vendor support matrices.
  3. Retest QoS after changing physical access speeds or encapsulation overhead.
  4. Calibrate measurement intervals and thresholds to avoid route flapping.

Explanation

Correct Answer

D:

Calibrate measurement intervals and thresholds to avoid route flapping. 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.

Incorrect Answers

A:

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.

B:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. 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.

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.

Question 597

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: 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 action MOST DIRECTLY meets the stated design requirement?

  1. Assess controller, edge and policy scale against supported platform limits before expansion.
  2. Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.
  3. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.
  4. Build redundant controller-reachability paths and test overlay recovery under provider isolation.

Explanation

Correct Answer

B:

Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application. This action addresses the stated design problem. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. A practical confirmation is: 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

A:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The actual fault is governed by a different mechanism: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The needed response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.

C:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The actual fault is governed by a different mechanism: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The needed response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.

D:

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: SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The needed response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.

Question 598

In a technical design review: 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 technical principle BEST explains the design decision?

  1. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.
  2. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works.
  3. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.
  4. GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site.

Explanation

Correct Answer

C:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The correct engineering response is: Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application. The observable check is: 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

A:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. 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.

B:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. 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.

D:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The offered choice instead concerns a different principle: GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. Those technical conditions are not interchangeable.

Question 599

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

  1. Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.
  2. Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.
  3. Edges maintain or recover authorized policy and reachability after one provider is removed.
  4. Test flows move to the healthy transport when configured SLA metrics are violated. The financial firm WAN acceptance record also captures this result.

Explanation

Correct Answer

D:

Test flows move to the healthy transport when configured SLA metrics are violated. The financial firm WAN acceptance record also captures this result. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.

Incorrect Answers

A:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. In the case being tested, SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The necessary acceptance evidence is: Test flows move to the healthy transport when configured SLA metrics are violated. The financial firm WAN acceptance record also captures this result.

B:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. In the case being tested, SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The necessary acceptance evidence is: Test flows move to the healthy transport when configured SLA metrics are violated. The financial firm WAN acceptance record also captures this result.

C:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. In the case being tested, SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The necessary acceptance evidence is: Test flows move to the healthy transport when configured SLA metrics are violated. The financial firm WAN acceptance record also captures this result.

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.