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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 71

Question 700

A preventive architecture review covers this situation: During a predeployment review for a university core network, the team discovers this design gap: tCP-heavy best-effort links suffer persistent tail drops and large bursts when output queues fill. 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. Use provider class mapping tables and test end-to-end during new circuit acceptance.
  2. Tune early-drop thresholds from actual queue statistics rather than default assumptions. Apply the same control to the university core network rollout checklist.
  3. Instrument congestion counters and test representative burst profiles before acceptance.
  4. Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.

Explanation

Correct Answer

B:

Tune early-drop thresholds from actual queue statistics rather than default assumptions. Apply the same control to the university core network rollout checklist. This control targets the underlying design risk. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The follow-up acceptance check remains: Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic. The university core network acceptance record also captures this result.

Incorrect Answers

A:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. A directly relevant preventive control is: Tune early-drop thresholds from actual queue statistics rather than default assumptions. Apply the same control to the university core network rollout checklist.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The repeat risk here is different: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. A directly relevant preventive control is: Tune early-drop thresholds from actual queue statistics rather than default assumptions. Apply the same control to the university core network rollout checklist.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The repeat risk here is different: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. A directly relevant preventive control is: Tune early-drop thresholds from actual queue statistics rather than default assumptions. Apply the same control to the university core network rollout checklist.

Question 701

A new campus or WAN review presents this constraint: A WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. Which action MOST DIRECTLY meets the stated design requirement?

  1. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  2. Provide a bounded low-latency priority queue for verified voice traffic.
  3. Use class-based weighted fair queuing with planned per-class bandwidth allocations.
  4. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.

Explanation

Correct Answer

D:

Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link. This action addresses the stated design problem. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A practical confirmation is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change.

Incorrect Answers

A:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The actual fault is governed by a different mechanism: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The needed response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.

B:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The actual fault is governed by a different mechanism: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The needed response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.

C:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The actual fault is governed by a different mechanism: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The needed response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.

Question 702

For this Cisco ENSLD design case: A WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. Which technical principle BEST explains the design decision?

  1. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.
  2. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  3. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.
  4. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.

Explanation

Correct Answer

A:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The correct engineering response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link. The observable check is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change.

Incorrect Answers

B:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The offered choice instead concerns a different principle: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. Those technical conditions are not interchangeable.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The offered choice instead concerns a different principle: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. Those technical conditions are not interchangeable.

D:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The offered choice instead concerns a different principle: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. Those technical conditions are not interchangeable.

Question 703

During acceptance testing for this network design: A WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. Which acceptance observation BEST establishes the intended result?

  1. Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.
  2. Peak-period loss, queue occupancy and jitter meet requirements after the policy change.
  3. The intended markings or provider classes are visible on both sides of the WAN demarcation.
  4. Provider policer drops decrease and application throughput settles near the planned service rate.

Explanation

Correct Answer

B:

Peak-period loss, queue occupancy and jitter meet requirements after the policy change. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.

Incorrect Answers

A:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. In the case being tested, Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The necessary acceptance evidence is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change.

C:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. In the case being tested, Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The necessary acceptance evidence is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The necessary acceptance evidence is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change.

Question 704

Operations wants to avoid recurrence of this design flaw: A WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Specify trusted and untrusted marking boundaries in the QoS design.
  2. Enforce priority admission limits and authenticate high-priority marking sources.
  3. Instrument congestion counters and test representative burst profiles before acceptance.
  4. Tune early-drop thresholds from actual queue statistics rather than default assumptions.

Explanation

Correct Answer

C:

Instrument congestion counters and test representative burst profiles before acceptance. This control targets the underlying design risk. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The follow-up acceptance check remains: Peak-period loss, queue occupancy and jitter meet requirements after the policy change.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The repeat risk here is different: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A directly relevant preventive control is: Instrument congestion counters and test representative burst profiles before acceptance.

B:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The repeat risk here is different: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A directly relevant preventive control is: Instrument congestion counters and test representative burst profiles before acceptance.

D:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The repeat risk here is different: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A directly relevant preventive control is: Instrument congestion counters and test representative burst profiles before acceptance.

Question 705

A Cisco enterprise designer reviews the following scenario: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.
  2. Use class-based weighted fair queuing with planned per-class bandwidth allocations.
  3. Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.
  4. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

Explanation

Correct Answer

A:

Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link. This action addresses the stated design problem. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A practical confirmation is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

B:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The actual fault is governed by a different mechanism: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The needed response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.

C:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The actual fault is governed by a different mechanism: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The needed response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The actual fault is governed by a different mechanism: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The needed response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.

Question 706

The network architecture board discusses the following: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others.
  2. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.
  3. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.
  4. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.

Explanation

Correct Answer

B:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The correct engineering response is: Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link. The observable check is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

A:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The offered choice instead concerns a different principle: a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. Those technical conditions are not interchangeable.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The offered choice instead concerns a different principle: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. Those technical conditions are not interchangeable.

D:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. 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.

Question 707

The infrastructure team must validate this situation: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.
  2. Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.
  3. Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result.
  4. Provider policer drops decrease and application throughput settles near the planned service rate.

Explanation

Correct Answer

C:

Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. In the case being tested, Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The necessary acceptance evidence is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result.

B:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. In the case being tested, Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The necessary acceptance evidence is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The necessary acceptance evidence is: Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result.

Question 708

A post-incident design review discusses the following: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a WAN design measures only average utilization and overlooks microbursts that exceed physical egress capacity. 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. Tune early-drop thresholds from actual queue statistics rather than default assumptions.
  2. Use provider class mapping tables and test end-to-end during new circuit acceptance.
  3. Specify trusted and untrusted marking boundaries in the QoS design.
  4. Instrument congestion counters and test representative burst profiles before acceptance. Apply the same control to the high-volume retail campus rollout checklist.

Explanation

Correct Answer

D:

Instrument congestion counters and test representative burst profiles before acceptance. Apply the same control to the high-volume retail campus rollout checklist. This control targets the underlying design risk. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The follow-up acceptance check remains: Peak-period loss, queue occupancy and jitter meet requirements after the policy change. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

A:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The repeat risk here is different: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A directly relevant preventive control is: Instrument congestion counters and test representative burst profiles before acceptance. Apply the same control to the high-volume retail campus rollout checklist.

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A directly relevant preventive control is: Instrument congestion counters and test representative burst profiles before acceptance. Apply the same control to the high-volume retail campus rollout checklist.

C:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The repeat risk here is different: Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. A directly relevant preventive control is: Instrument congestion counters and test representative burst profiles before acceptance. Apply the same control to the high-volume retail campus rollout checklist.

Question 709

During a network design workshop, the team finds this issue: The enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. Which action MOST DIRECTLY meets the stated design requirement?

  1. Classify and provide bounded bandwidth priority for required management-plane protocols.
  2. Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.
  3. Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.
  4. Design physically or logically separate out-of-band management access with independent reachability.

Explanation

Correct Answer

B:

Separate management reachability into an appropriate management VRF or dedicated management network with restricted access. This action addresses the stated design problem. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A practical confirmation is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

Incorrect Answers

A:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The actual fault is governed by a different mechanism: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The needed response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.

C:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The actual fault is governed by a different mechanism: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The needed response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.

D:

OOB management can remain accessible when an in-band production network or routing plane fails. The actual fault is governed by a different mechanism: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The needed response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.

Question 710

In a technical design review: The enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. Which technical principle BEST explains the design decision?

  1. Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries.
  2. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy.
  3. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.
  4. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.

Explanation

Correct Answer

C:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The correct engineering response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access. The observable check is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

Incorrect Answers

A:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The offered choice instead concerns a different principle: Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. Those technical conditions are not interchangeable.

B:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The offered choice instead concerns a different principle: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. Those technical conditions are not interchangeable.

D:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The offered choice instead concerns a different principle: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. Those technical conditions are not interchangeable.