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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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Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests

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Cisco 300-420 Practice Test 62

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.

Question 611

The infrastructure team must validate this situation: A branch sends real-time voice and large backups across the same constrained SD-WAN overlay. Which acceptance observation BEST establishes the intended result?

  1. A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.
  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. Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

Explanation

Correct Answer

C:

Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points.

Incorrect Answers

A:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. In the case being tested, SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The necessary acceptance evidence is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.

B:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. In the case being tested, SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The necessary acceptance evidence is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. In the case being tested, SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The necessary acceptance evidence is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.

Question 612

A post-incident design review discusses the following: A branch sends real-time voice and large backups across the same constrained SD-WAN overlay. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Calibrate measurement intervals and thresholds to avoid route flapping.
  2. Include multicast join, leave and recovery exercises in overlay acceptance tests.
  3. Track site and route growth forecasts against vendor support matrices.
  4. Retest QoS after changing physical access speeds or encapsulation overhead.

Explanation

Correct Answer

D:

Retest QoS after changing physical access speeds or encapsulation overhead. This control targets the underlying design risk. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The follow-up acceptance check remains: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer.

Incorrect Answers

A:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The repeat risk here is different: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. A directly relevant preventive control is: Retest QoS after changing physical access speeds or encapsulation overhead.

B:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The repeat risk here is different: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. A directly relevant preventive control is: Retest QoS after changing physical access speeds or encapsulation overhead.

C:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The repeat risk here is different: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. A directly relevant preventive control is: Retest QoS after changing physical access speeds or encapsulation overhead.

Question 613

During a network design workshop, the team finds this issue: During a predeployment review for a coastal branch network, the team discovers this design gap: a branch sends real-time voice and large backups across the same constrained SD-WAN overlay. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.
  3. Build redundant controller-reachability paths and test overlay recovery under provider isolation.
  4. Add a diverse second access circuit and suitable edge failover to eliminate the single access-link fault domain.

Explanation

Correct Answer

B:

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

Incorrect Answers

A:

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.

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:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. 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 614

In a technical design review: During a predeployment review for a coastal branch network, the team discovers this design gap: a branch sends real-time voice and large backups across the same constrained SD-WAN overlay. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains.
  3. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points.
  4. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.

Explanation

Correct Answer

C:

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

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.

B:

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

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.

Question 615

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 branch sends real-time voice and large backups across the same constrained SD-WAN overlay. 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. Test flows move to the healthy transport when configured SLA metrics are violated.
  3. A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.
  4. Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer. The coastal branch network acceptance record also captures this result.

Explanation

Correct Answer

D:

Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer. The coastal branch network acceptance record also captures this result. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points.

Incorrect Answers

A:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. In the case being tested, SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The necessary acceptance evidence is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer. The coastal branch network acceptance record also captures this result.

B:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. In the case being tested, SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The necessary acceptance evidence is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer. The coastal branch network 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, SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The necessary acceptance evidence is: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer. The coastal branch network acceptance record also captures this result.

Question 616

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 branch sends real-time voice and large backups across the same constrained SD-WAN overlay. 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. Retest QoS after changing physical access speeds or encapsulation overhead. Apply the same control to the coastal branch network rollout checklist.
  2. Include multicast join, leave and recovery exercises in overlay acceptance tests.
  3. Exercise controller and transit provider failures independently in the lab.
  4. Track site and route growth forecasts against vendor support matrices.

Explanation

Correct Answer

A:

Retest QoS after changing physical access speeds or encapsulation overhead. Apply the same control to the coastal branch network rollout checklist. This control targets the underlying design risk. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The follow-up acceptance check remains: Voice loss/jitter stays within SLA during a simultaneous sustained backup transfer. The coastal branch network acceptance record also captures this result.

Incorrect Answers

B:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The repeat risk here is different: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. A directly relevant preventive control is: Retest QoS after changing physical access speeds or encapsulation overhead. Apply the same control to the coastal branch network rollout checklist.

C:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. The repeat risk here is different: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. A directly relevant preventive control is: Retest QoS after changing physical access speeds or encapsulation overhead. Apply the same control to the coastal branch network rollout checklist.

D:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The repeat risk here is different: SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. A directly relevant preventive control is: Retest QoS after changing physical access speeds or encapsulation overhead. Apply the same control to the coastal branch network rollout checklist.

Question 617

A design team must resolve this enterprise network problem: An SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. 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. Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.
  3. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.
  4. Use separate redundant edge devices and verify upstream termination diversity.

Explanation

Correct Answer

C:

Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements. This action addresses the stated design problem. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. A practical confirmation is: Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

Incorrect Answers

A:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The actual fault is governed by a different mechanism: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The needed response is: Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.

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: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The needed response is: Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.

D:

Two external circuits on one router still share a single customer edge hardware failure domain. The actual fault is governed by a different mechanism: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The needed response is: Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.

Question 618

The design record describes this issue: An SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. Which technical principle BEST explains the design decision?

  1. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.
  2. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works.
  3. SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points.
  4. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.

Explanation

Correct Answer

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The correct engineering response is: Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements. The observable check is: Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

Incorrect Answers

A:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. 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.

B:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. 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:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. 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 619

After designing a change for the following scenario: An SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. 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. A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.
  4. Authorized group members exchange encrypted traffic over normal private WAN routes and rekey successfully.

Explanation

Correct Answer

A:

Joined receivers at two sites receive correct multicast streams without excessive unwanted replication. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.

Incorrect Answers

B:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. In the case being tested, Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The necessary acceptance evidence is: Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

C:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. In the case being tested, Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The necessary acceptance evidence is: Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

D:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. In the case being tested, Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The necessary acceptance evidence is: Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

Question 620

A preventive architecture review covers this situation: An SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Calibrate measurement intervals and thresholds to avoid route flapping.
  2. Include multicast join, leave and recovery exercises in overlay acceptance tests.
  3. Retest QoS after changing physical access speeds or encapsulation overhead.
  4. Protect group-key distribution and test key-server redundancy and rekey intervals.

Explanation

Correct Answer

B:

Include multicast join, leave and recovery exercises in overlay acceptance tests. This control targets the underlying design risk. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The follow-up acceptance check remains: Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

Incorrect Answers

A:

SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability. The repeat risk here is different: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. A directly relevant preventive control is: Include multicast join, leave and recovery exercises in overlay acceptance tests.

C:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The repeat risk here is different: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. A directly relevant preventive control is: Include multicast join, leave and recovery exercises in overlay acceptance tests.

D:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The repeat risk here is different: Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. A directly relevant preventive control is: Include multicast join, leave and recovery exercises in overlay acceptance tests.