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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 70

Question 690

The network architecture board discusses the following: During a predeployment review for a hospital regional backbone, the team discovers this design gap: bulk transactions and routine web data need minimum bandwidth shares during congestion but neither is real-time voice. 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. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.
  3. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.
  4. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.

Explanation

Correct Answer

B:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The correct engineering response is: Use class-based weighted fair queuing with planned per-class bandwidth allocations. The observable check is: Congestion tests show each class receives at least its configured effective share where the scheduler applies. The hospital regional backbone acceptance record also captures this result.

Incorrect Answers

A:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. 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:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The offered choice instead concerns a different principle: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. Those technical conditions are not interchangeable.

D:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. 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.

Question 691

The infrastructure team must validate this situation: During a predeployment review for a hospital regional backbone, the team discovers this design gap: bulk transactions and routine web data need minimum bandwidth shares during congestion but neither is real-time voice. 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. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.
  3. Congestion tests show each class receives at least its configured effective share where the scheduler applies. The hospital regional backbone acceptance record also captures this result.
  4. Measured guest traffic stays within the configured policer allowance under sustained load.

Explanation

Correct Answer

C:

Congestion tests show each class receives at least its configured effective share where the scheduler applies. The hospital regional backbone acceptance record also captures this result. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. In the case being tested, CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The necessary acceptance evidence is: Congestion tests show each class receives at least its configured effective share where the scheduler applies. The hospital regional backbone acceptance record also captures this result.

B:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. In the case being tested, CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The necessary acceptance evidence is: Congestion tests show each class receives at least its configured effective share where the scheduler applies. The hospital regional backbone acceptance record also captures this result.

D:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. In the case being tested, CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The necessary acceptance evidence is: Congestion tests show each class receives at least its configured effective share where the scheduler applies. The hospital regional backbone acceptance record also captures this result.

Question 692

A post-incident design review discusses the following: During a predeployment review for a hospital regional backbone, the team discovers this design gap: bulk transactions and routine web data need minimum bandwidth shares during congestion but neither is real-time 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. Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.
  2. Reassess policer burst settings whenever the access circuit size changes.
  3. Use provider class mapping tables and test end-to-end during new circuit acceptance.
  4. Document service class allocations and retest after link-rate changes. Apply the same control to the hospital regional backbone rollout checklist.

Explanation

Correct Answer

D:

Document service class allocations and retest after link-rate changes. Apply the same control to the hospital regional backbone rollout checklist. This control targets the underlying design risk. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The follow-up acceptance check remains: Congestion tests show each class receives at least its configured effective share where the scheduler applies. The hospital regional backbone acceptance record also captures this result.

Incorrect Answers

A:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The repeat risk here is different: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. A directly relevant preventive control is: Document service class allocations and retest after link-rate changes. Apply the same control to the hospital regional backbone rollout checklist.

B:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The repeat risk here is different: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. A directly relevant preventive control is: Document service class allocations and retest after link-rate changes. Apply the same control to the hospital regional backbone rollout checklist.

C:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. A directly relevant preventive control is: Document service class allocations and retest after link-rate changes. Apply the same control to the hospital regional backbone rollout checklist.

Question 693

During a network design workshop, the team finds this issue: TCP-heavy best-effort links suffer persistent tail drops and large bursts when output queues fill. Which action MOST DIRECTLY meets the stated design requirement?

  1. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.
  2. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  3. Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.
  4. Use an appropriate traffic policer at the guest policy boundary.

Explanation

Correct Answer

B:

Consider supported early-drop queue management such as WRED for an appropriate nonpriority class. This action addresses the stated design problem. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. A practical confirmation is: Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

Incorrect Answers

A:

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: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The needed response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.

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: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The needed response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.

D:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The actual fault is governed by a different mechanism: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The needed response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.

Question 694

In a technical design review: TCP-heavy best-effort links suffer persistent tail drops and large bursts when output queues fill. Which technical principle BEST explains the design decision?

  1. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.
  2. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others.
  3. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  4. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.

Explanation

Correct Answer

C:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The correct engineering response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class. The observable check is: Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

Incorrect Answers

A:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. 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.

B:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. 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.

D:

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

Question 695

An engineering reviewer needs objective proof for the following: TCP-heavy best-effort links suffer persistent tail drops and large bursts when output queues fill. Which acceptance observation BEST establishes the intended result?

  1. Measured guest traffic stays within the configured policer allowance under sustained load.
  2. The intended markings or provider classes are visible on both sides of the WAN demarcation.
  3. Provider policer drops decrease and application throughput settles near the planned service rate.
  4. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

Explanation

Correct Answer

D:

Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.

Incorrect Answers

A:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. In the case being tested, Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The necessary acceptance evidence is: Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. In the case being tested, Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The necessary acceptance evidence is: Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

C:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The necessary acceptance evidence is: Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

Question 696

The change advisory board sees a repeat risk in this case: TCP-heavy best-effort links suffer persistent tail drops and large bursts when output queues fill. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Tune early-drop thresholds from actual queue statistics rather than default assumptions.
  2. Enforce priority admission limits and authenticate high-priority marking sources.
  3. Document service class allocations and retest after link-rate changes.
  4. Specify trusted and untrusted marking boundaries in the QoS design.

Explanation

Correct Answer

A:

Tune early-drop thresholds from actual queue statistics rather than default assumptions. 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.

Incorrect Answers

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: 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.

C:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. 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.

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. 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.

Question 697

A design team must resolve this enterprise network problem: 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 action MOST DIRECTLY meets the stated design requirement?

  1. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.
  2. Use an appropriate traffic policer at the guest policy boundary.
  3. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  4. Use class-based weighted fair queuing with planned per-class bandwidth allocations.

Explanation

Correct Answer

C:

Consider supported early-drop queue management such as WRED for an appropriate nonpriority class. This action addresses the stated design problem. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. A practical confirmation is: 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:

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: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The needed response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.

B:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The actual fault is governed by a different mechanism: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The needed response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.

D:

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: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The needed response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.

Question 698

The design record describes this issue: 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 technical principle BEST explains the design decision?

  1. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.
  2. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.
  3. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.
  4. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.

Explanation

Correct Answer

D:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The correct engineering response is: Consider supported early-drop queue management such as WRED for an appropriate nonpriority class. The observable check is: 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:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. 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.

B:

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

C:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The offered choice instead concerns a different principle: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. Those technical conditions are not interchangeable.

Question 699

After designing a change for the following scenario: 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 acceptance observation BEST establishes the intended result?

  1. 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.
  2. Congestion tests show each class receives at least its configured effective share where the scheduler applies.
  3. Peak-period loss, queue occupancy and jitter meet requirements after the policy change.
  4. Provider policer drops decrease and application throughput settles near the planned service rate.

Explanation

Correct Answer

A:

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. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.

Incorrect Answers

B:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. In the case being tested, Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The necessary acceptance evidence is: 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.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. In the case being tested, Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The necessary acceptance evidence is: 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.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The necessary acceptance evidence is: 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.

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.