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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 56

Question 550

In a technical design review: During a predeployment review for a financial firm WAN, the team discovers this design gap: two ISP circuits terminate on one edge router and the design claims hardware-resilient WAN connectivity. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access.
  2. Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable.
  3. Two external circuits on one router still share a single customer edge hardware failure domain.
  4. Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system.

Explanation

Correct Answer

C:

Two external circuits on one router still share a single customer edge hardware failure domain. The correct engineering response is: Use separate redundant edge devices and verify upstream termination diversity. The observable check is: Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

A:

Two external circuits on one router still share a single customer edge hardware failure domain. The offered choice instead concerns a different principle: Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. Those technical conditions are not interchangeable.

B:

Two external circuits on one router still share a single customer edge hardware failure domain. The offered choice instead concerns a different principle: Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. Those technical conditions are not interchangeable.

D:

Two external circuits on one router still share a single customer edge hardware failure domain. The offered choice instead concerns a different principle: Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. Those technical conditions are not interchangeable.

Question 551

An engineering reviewer needs objective proof for the following: During a predeployment review for a financial firm WAN, the team discovers this design gap: two ISP circuits terminate on one edge router and the design claims hardware-resilient WAN connectivity. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. During an induced primary failure, voice delay and critical application loss remain within policy thresholds.
  2. The factory continues its critical transaction workload after the primary access span is disabled.
  3. Approved applications survive active-active operation and failover without state-related drops.
  4. Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget. The financial firm WAN acceptance record also captures this result.

Explanation

Correct Answer

D:

Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget. The financial firm WAN acceptance record also captures this result. Two external circuits on one router still share a single customer edge hardware failure domain.

Incorrect Answers

A:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. In the case being tested, Two external circuits on one router still share a single customer edge hardware failure domain. The necessary acceptance evidence is: Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget. The financial firm WAN acceptance record also captures this result.

B:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. In the case being tested, Two external circuits on one router still share a single customer edge hardware failure domain. The necessary acceptance evidence is: Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget. The financial firm WAN acceptance record also captures this result.

C:

Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. In the case being tested, Two external circuits on one router still share a single customer edge hardware failure domain. The necessary acceptance evidence is: Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget. The financial firm WAN acceptance record also captures this result.

Question 552

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: two ISP circuits terminate on one edge router and the design claims hardware-resilient WAN connectivity. 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. Include chassis, power and provider-path diversity in WAN high-availability reviews. Apply the same control to the financial firm WAN rollout checklist.
  2. Test both traffic directions and firewall session replication with realistic WAN failures.
  3. Rehearse production-size failover load and monitor backup usage limits.
  4. Audit actual last-mile diversity rather than counting two circuits sharing a duct as independent.

Explanation

Correct Answer

A:

Include chassis, power and provider-path diversity in WAN high-availability reviews. Apply the same control to the financial firm WAN rollout checklist. This control targets the underlying design risk. Two external circuits on one router still share a single customer edge hardware failure domain. The follow-up acceptance check remains: Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget. The financial firm WAN acceptance record also captures this result.

Incorrect Answers

B:

Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. The repeat risk here is different: Two external circuits on one router still share a single customer edge hardware failure domain. A directly relevant preventive control is: Include chassis, power and provider-path diversity in WAN high-availability reviews. Apply the same control to the financial firm WAN rollout checklist.

C:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The repeat risk here is different: Two external circuits on one router still share a single customer edge hardware failure domain. A directly relevant preventive control is: Include chassis, power and provider-path diversity in WAN high-availability reviews. Apply the same control to the financial firm WAN rollout checklist.

D:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. The repeat risk here is different: Two external circuits on one router still share a single customer edge hardware failure domain. A directly relevant preventive control is: Include chassis, power and provider-path diversity in WAN high-availability reviews. Apply the same control to the financial firm WAN rollout checklist.

Question 553

A design team must resolve this enterprise network problem: A primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. Which action MOST DIRECTLY meets the stated design requirement?

  1. Validate directional path symmetry needs and application statefulness before enabling multipath traffic.
  2. Use separate redundant edge devices and verify upstream termination diversity.
  3. Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.
  4. Design end-to-end class-aware QoS, admission and bandwidth policy for voice and bulk data.

Explanation

Correct Answer

C:

Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport. This action addresses the stated design problem. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A practical confirmation is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds.

Incorrect Answers

A:

Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. The actual fault is governed by a different mechanism: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The needed response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.

B:

Two external circuits on one router still share a single customer edge hardware failure domain. The actual fault is governed by a different mechanism: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The needed response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.

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: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The needed response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.

Question 554

The design record describes this issue: A primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. Which technical principle BEST explains the design decision?

  1. Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access.
  2. Two external circuits on one router still share a single customer edge hardware failure domain.
  3. GRE can encapsulate multicast or nonnative payloads over a unicast IP underlay but supplies no encryption by itself.
  4. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS.

Explanation

Correct Answer

D:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The correct engineering response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport. The observable check is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds.

Incorrect Answers

A:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The offered choice instead concerns a different principle: Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. Those technical conditions are not interchangeable.

B:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. 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.

C:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. 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 555

After designing a change for the following scenario: A primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. Which acceptance observation BEST establishes the intended result?

  1. During an induced primary failure, voice delay and critical application loss remain within policy thresholds.
  2. Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget.
  3. The factory continues its critical transaction workload after the primary access span is disabled.
  4. Joined receivers at two sites receive correct multicast streams without excessive unwanted replication.

Explanation

Correct Answer

A:

During an induced primary failure, voice delay and critical application loss remain within policy thresholds. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS.

Incorrect Answers

B:

Two external circuits on one router still share a single customer edge hardware failure domain. In the case being tested, Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The necessary acceptance evidence is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds.

C:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. In the case being tested, Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The necessary acceptance evidence is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds.

D:

Unicast overlay reachability does not guarantee multicast replication, membership or underlay support. In the case being tested, Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The necessary acceptance evidence is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds.

Question 556

A preventive architecture review covers this situation: A primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test both traffic directions and firewall session replication with realistic WAN failures.
  2. Rehearse production-size failover load and monitor backup usage limits.
  3. Audit actual last-mile diversity rather than counting two circuits sharing a duct as independent.
  4. Track site and route growth forecasts against vendor support matrices.

Explanation

Correct Answer

B:

Rehearse production-size failover load and monitor backup usage limits. This control targets the underlying design risk. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The follow-up acceptance check remains: During an induced primary failure, voice delay and critical application loss remain within policy thresholds.

Incorrect Answers

A:

Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. The repeat risk here is different: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A directly relevant preventive control is: Rehearse production-size failover load and monitor backup usage limits.

C:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. The repeat risk here is different: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A directly relevant preventive control is: Rehearse production-size failover load and monitor backup usage limits.

D:

Route, tunnel and policy scale constraints can become bottlenecks even when an initial pilot works. The repeat risk here is different: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A directly relevant preventive control is: Rehearse production-size failover load and monitor backup usage limits.

Question 557

A new campus or WAN review presents this constraint: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Validate directional path symmetry needs and application statefulness before enabling multipath traffic.
  2. Use separate redundant edge devices and verify upstream termination diversity.
  3. Evaluate a Metro Ethernet E-Line style service with measured bandwidth and service-level requirements.
  4. Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.

Explanation

Correct Answer

D:

Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport. This action addresses the stated design problem. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A practical confirmation is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

A:

Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. The actual fault is governed by a different mechanism: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The needed response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.

B:

Two external circuits on one router still share a single customer edge hardware failure domain. The actual fault is governed by a different mechanism: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The needed response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.

C:

Metro Ethernet can present an Ethernet service to customer edges without requiring a private optical system. The actual fault is governed by a different mechanism: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The needed response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport.

Question 558

For this Cisco ENSLD design case: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS.
  2. Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable.
  3. Two external circuits on one router still share a single customer edge hardware failure domain.
  4. IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them.

Explanation

Correct Answer

A:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The correct engineering response is: Set critical application priorities and capacity controls specifically for the lower-bandwidth backup transport. The observable check is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

B:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The offered choice instead concerns a different principle: Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. Those technical conditions are not interchangeable.

C:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. 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.

D:

Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The offered choice instead concerns a different principle: IPsec secures eligible IP packets using negotiated security associations; GRE alone does not encrypt them. Those technical conditions are not interchangeable.

Question 559

During acceptance testing for this network design: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Approved applications survive active-active operation and failover without state-related drops.
  2. During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result.
  3. Loss of either edge router leaves an alternate WAN path functional within the agreed outage budget.
  4. The factory continues its critical transaction workload after the primary access span is disabled.

Explanation

Correct Answer

B:

During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS.

Incorrect Answers

A:

Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. In the case being tested, Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The necessary acceptance evidence is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result.

C:

Two external circuits on one router still share a single customer edge hardware failure domain. In the case being tested, Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The necessary acceptance evidence is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result.

D:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. In the case being tested, Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The necessary acceptance evidence is: During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result.

Question 560

Operations wants to avoid recurrence of this design flaw: During a predeployment review for a multimodal logistics WAN, the team discovers this design gap: a primary high-bandwidth WAN link fails and an undersized LTE backup becomes saturated, disrupting voice. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test both traffic directions and firewall session replication with realistic WAN failures.
  2. Include chassis, power and provider-path diversity in WAN high-availability reviews.
  3. Rehearse production-size failover load and monitor backup usage limits. Apply the same control to the multimodal logistics WAN rollout checklist.
  4. Audit actual last-mile diversity rather than counting two circuits sharing a duct as independent.

Explanation

Correct Answer

C:

Rehearse production-size failover load and monitor backup usage limits. Apply the same control to the multimodal logistics WAN rollout checklist. This control targets the underlying design risk. Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. The follow-up acceptance check remains: During an induced primary failure, voice delay and critical application loss remain within policy thresholds. The multimodal logistics WAN acceptance record also captures this result.

Incorrect Answers

A:

Stateful security and asymmetric routing can disrupt sessions even when both paths are individually reachable. The repeat risk here is different: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A directly relevant preventive control is: Rehearse production-size failover load and monitor backup usage limits. Apply the same control to the multimodal logistics WAN rollout checklist.

B:

Two external circuits on one router still share a single customer edge hardware failure domain. The repeat risk here is different: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A directly relevant preventive control is: Rehearse production-size failover load and monitor backup usage limits. Apply the same control to the multimodal logistics WAN rollout checklist.

D:

Single-homing leaves a single path failure that routing protocols cannot repair without alternate physical access. The repeat risk here is different: Failover changes available capacity; a backup path that is up may still violate application SLA without admission or QoS. A directly relevant preventive control is: Rehearse production-size failover load and monitor backup usage limits. Apply the same control to the multimodal logistics WAN rollout checklist.