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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 63

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.

Question 621

A new campus or WAN review presents this constraint: During a predeployment review for a global retail WAN, the team discovers this design gap: an SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. 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. Build redundant controller-reachability paths and test overlay recovery under provider isolation.
  3. Use OMP for overlay route and policy information while leaving end-user forwarding to the WAN-edge data plane.
  4. Design multicast support across the selected SD-WAN fabric and validate replication or rendezvous requirements.

Explanation

Correct Answer

D:

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. The global retail 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: 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:

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: 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.

C:

The SD-WAN overlay control plane distributes reachability or policy, not the application payload itself. 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 622

For this Cisco ENSLD design case: During a predeployment review for a global retail WAN, the team discovers this design gap: an SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. 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. Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains.
  3. SLA-based policy selects eligible paths using active performance measurements rather than only static next-hop reachability.
  4. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.

Explanation

Correct Answer

A:

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. The global retail WAN acceptance record also captures this result.

Incorrect Answers

B:

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

C:

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.

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The offered choice instead concerns a different principle: GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself. Those technical conditions are not interchangeable.

Question 623

During acceptance testing for this network design: During a predeployment review for a global retail WAN, the team discovers this design gap: an SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Edges maintain or recover authorized policy and reachability after one provider is removed.
  2. Joined receivers at two sites receive correct multicast streams without excessive unwanted replication. The global retail WAN acceptance record also captures this result.
  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

B:

Joined receivers at two sites receive correct multicast streams without excessive unwanted replication. The global retail WAN acceptance record also captures this result. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.

Incorrect Answers

A:

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. The global retail WAN acceptance record also captures this result.

C:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. 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. The global retail WAN acceptance record also captures this result.

D:

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. The global retail WAN acceptance record also captures this result.

Question 624

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a global retail WAN, the team discovers this design gap: an SD-WAN deployment needs multicast application delivery across sites but the plan only validates unicast tunnels. 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. Retest QoS after changing physical access speeds or encapsulation overhead.
  3. Include multicast join, leave and recovery exercises in overlay acceptance tests. Apply the same control to the global retail WAN rollout checklist.
  4. Calibrate measurement intervals and thresholds to avoid route flapping.

Explanation

Correct Answer

C:

Include multicast join, leave and recovery exercises in overlay acceptance tests. Apply the same control to the global retail WAN rollout checklist. 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. The global retail 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: 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. Apply the same control to the global retail WAN rollout checklist.

B:

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. Apply the same control to the global retail WAN rollout checklist.

D:

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. Apply the same control to the global retail WAN rollout checklist.

Question 625

A Cisco enterprise designer reviews the following scenario: The enterprise adds many branch sites and new cloud routes, potentially exceeding SD-WAN edge route and tunnel scale. Which action MOST DIRECTLY meets the stated design requirement?

  1. Assess controller, edge and policy scale against supported platform limits before expansion.
  2. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.
  3. Use application-aware SD-WAN routing with measured loss, latency and jitter thresholds for that application.
  4. Evaluate Group Encrypted Transport VPN where platform support and shared WAN routing permit its use.

Explanation

Correct Answer

A:

Assess controller, edge and policy scale against supported platform limits before expansion. This action addresses the stated design problem. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. A practical confirmation is: A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

Incorrect Answers

B:

SD-WAN path choice does not replace queuing and traffic treatment at physical congestion points. The actual fault is governed by a different mechanism: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The needed response is: Assess controller, edge and policy scale against supported platform limits before expansion.

C:

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: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The needed response is: Assess controller, edge and policy scale against supported platform limits before expansion.

D:

GETVPN can encrypt group traffic on a trusted routed core without requiring pairwise tunnel overlays between every site. The actual fault is governed by a different mechanism: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The needed response is: Assess controller, edge and policy scale against supported platform limits before expansion.

Question 626

The network architecture board discusses the following: The enterprise adds many branch sites and new cloud routes, potentially exceeding SD-WAN edge route and tunnel scale. 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. Unicast overlay reachability does not guarantee multicast replication, membership or underlay support.
  4. Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services.

Explanation

Correct Answer

B:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The correct engineering response is: Assess controller, edge and policy scale against supported platform limits before expansion. The observable check is: A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

Incorrect Answers

A:

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

C:

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

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The offered choice instead concerns a different principle: Secure SD-WAN onboarding depends on authenticated controllers and connectivity to the orchestration services. Those technical conditions are not interchangeable.

Question 627

The infrastructure team must validate this situation: The enterprise adds many branch sites and new cloud routes, potentially exceeding SD-WAN edge route and tunnel scale. 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 spokes resolve each other’s tunnel address and exchange traffic through the expected protected path.

Explanation

Correct Answer

C:

A scale test at planned route and branch volume meets CPU, memory and policy distribution limits. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works.

Incorrect Answers

A:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. In the case being tested, Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The necessary acceptance evidence is: A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

B:

Resilient SD-WAN depends on control-plane connectivity and viable data-plane paths across failure domains. In the case being tested, Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The necessary acceptance evidence is: A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

D:

DMVPN uses hub-assisted next-hop resolution to support dynamic spoke connectivity over multipoint GRE, commonly secured with IPsec. In the case being tested, Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The necessary acceptance evidence is: A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

Question 628

A post-incident design review discusses the following: The enterprise adds many branch sites and new cloud routes, potentially exceeding SD-WAN edge route and tunnel scale. 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. Test cellular failover, authentication, signal quality and billing controls regularly.
  4. Track site and route growth forecasts against vendor support matrices.

Explanation

Correct Answer

D:

Track site and route growth forecasts against vendor support matrices. This control targets the underlying design risk. Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The follow-up acceptance check remains: A scale test at planned route and branch volume meets CPU, memory and policy distribution limits.

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: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. A directly relevant preventive control is: Track site and route growth forecasts against vendor support matrices.

B:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. The repeat risk here is different: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. A directly relevant preventive control is: Track site and route growth forecasts against vendor support matrices.

C:

Cellular WAN connectivity provides a separate access medium but has latency, availability and usage constraints. The repeat risk here is different: Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. A directly relevant preventive control is: Track site and route growth forecasts against vendor support matrices.

Question 629

During a network design workshop, the team finds this issue: A voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it.
  2. Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.
  3. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.
  4. Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.

Explanation

Correct Answer

B:

Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations. This action addresses the stated design problem. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A practical confirmation is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

Incorrect Answers

A:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The actual fault is governed by a different mechanism: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The needed response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.

C:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The actual fault is governed by a different mechanism: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The needed response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.

D:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The actual fault is governed by a different mechanism: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The needed response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.

Question 630

In a technical design review: A voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. Which technical principle BEST explains the design decision?

  1. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs.
  2. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.
  3. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state.
  4. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.

Explanation

Correct Answer

C:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The correct engineering response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations. The observable check is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

Incorrect Answers

A:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The offered choice instead concerns a different principle: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. Those technical conditions are not interchangeable.

B:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The offered choice instead concerns a different principle: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. Those technical conditions are not interchangeable.

D:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The offered choice instead concerns a different principle: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. Those technical conditions are not interchangeable.