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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 68

Question 670

For this Cisco ENSLD design case: A guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. Which technical principle BEST explains the design decision?

  1. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.
  2. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.
  3. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.
  4. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.

Explanation

Correct Answer

A:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The correct engineering response is: Use an appropriate traffic policer at the guest policy boundary. The observable check is: Measured guest traffic stays within the configured policer allowance under sustained load.

Incorrect Answers

B:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. 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.

C:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. 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:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. 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.

Question 671

During acceptance testing for this network design: A guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. Which acceptance observation BEST establishes the intended result?

  1. Congestion tests show each class receives at least its configured effective share where the scheduler applies.
  2. Measured guest traffic stays within the configured policer allowance under sustained load.
  3. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.
  4. Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

Explanation

Correct Answer

B:

Measured guest traffic stays within the configured policer allowance under sustained load. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.

Incorrect Answers

A:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. In the case being tested, Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The necessary acceptance evidence is: Measured guest traffic stays within the configured policer allowance under sustained load.

C:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. In the case being tested, Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The necessary acceptance evidence is: Measured guest traffic stays within the configured policer allowance under sustained load.

D:

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, Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The necessary acceptance evidence is: Measured guest traffic stays within the configured policer allowance under sustained load.

Question 672

Operations wants to avoid recurrence of this design flaw: A guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. 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. Specify trusted and untrusted marking boundaries in the QoS design.
  3. Reassess policer burst settings whenever the access circuit size changes.
  4. Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.

Explanation

Correct Answer

C:

Reassess policer burst settings whenever the access circuit size changes. This control targets the underlying design risk. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The follow-up acceptance check remains: Measured guest traffic stays within the configured policer allowance under sustained load.

Incorrect Answers

A:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. A directly relevant preventive control is: Reassess policer burst settings whenever the access circuit size changes.

B:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The repeat risk here is different: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. A directly relevant preventive control is: Reassess policer burst settings whenever the access circuit size changes.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The repeat risk here is different: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. A directly relevant preventive control is: Reassess policer burst settings whenever the access circuit size changes.

Question 673

A Cisco enterprise designer reviews the following scenario: During a predeployment review for an enterprise services hub, the team discovers this design gap: a guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. 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 an appropriate traffic policer at the guest policy boundary.
  2. Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.
  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

A:

Use an appropriate traffic policer at the guest policy boundary. This action addresses the stated design problem. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. A practical confirmation is: Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub acceptance record also captures this result.

Incorrect Answers

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The actual fault is governed by a different mechanism: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The needed response is: Use an appropriate traffic policer at the guest policy boundary.

C:

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: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The needed response is: Use an appropriate traffic policer at the guest policy boundary.

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: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The needed response is: Use an appropriate traffic policer at the guest policy boundary.

Question 674

The network architecture board discusses the following: During a predeployment review for an enterprise services hub, the team discovers this design gap: a guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.
  3. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.
  4. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.

Explanation

Correct Answer

B:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The correct engineering response is: Use an appropriate traffic policer at the guest policy boundary. The observable check is: Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub acceptance record also captures this result.

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. 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.

C:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. 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:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. 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 675

The infrastructure team must validate this situation: During a predeployment review for an enterprise services hub, the team discovers this design gap: a guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Provider policer drops decrease and application throughput settles near the planned service rate.
  2. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.
  3. Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub acceptance record also captures this result.
  4. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Explanation

Correct Answer

C:

Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub acceptance record also captures this result. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.

Incorrect Answers

A:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The necessary acceptance evidence is: Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub 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, Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The necessary acceptance evidence is: Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub acceptance record also captures this result.

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. In the case being tested, Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The necessary acceptance evidence is: Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub acceptance record also captures this result.

Question 676

A post-incident design review discusses the following: During a predeployment review for an enterprise services hub, the team discovers this design gap: a guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. 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. Document service class allocations and retest after link-rate changes.
  4. Reassess policer burst settings whenever the access circuit size changes. Apply the same control to the enterprise services hub rollout checklist.

Explanation

Correct Answer

D:

Reassess policer burst settings whenever the access circuit size changes. Apply the same control to the enterprise services hub rollout checklist. This control targets the underlying design risk. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The follow-up acceptance check remains: Measured guest traffic stays within the configured policer allowance under sustained load. The enterprise services hub 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: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. A directly relevant preventive control is: Reassess policer burst settings whenever the access circuit size changes. Apply the same control to the enterprise services hub rollout checklist.

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. A directly relevant preventive control is: Reassess policer burst settings whenever the access circuit size changes. Apply the same control to the enterprise services hub rollout checklist.

C:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The repeat risk here is different: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. A directly relevant preventive control is: Reassess policer burst settings whenever the access circuit size changes. Apply the same control to the enterprise services hub rollout checklist.

Question 677

During a network design workshop, the team finds this issue: Voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use class-based weighted fair queuing with planned per-class bandwidth allocations.
  2. Provide a bounded low-latency priority queue for verified voice traffic.
  3. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.
  4. Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

Explanation

Correct Answer

B:

Provide a bounded low-latency priority queue for verified voice traffic. This action addresses the stated design problem. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. A practical confirmation is: Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

Incorrect Answers

A:

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: a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The needed response is: Provide a bounded low-latency priority queue for verified voice traffic.

C:

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: a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The needed response is: Provide a bounded low-latency priority queue for verified voice traffic.

D:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The actual fault is governed by a different mechanism: a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The needed response is: Provide a bounded low-latency priority queue for verified voice traffic.

Question 678

In a technical design review: Voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. Which technical principle BEST explains the design decision?

  1. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.
  2. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.
  3. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others.
  4. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.

Explanation

Correct Answer

C:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The correct engineering response is: Provide a bounded low-latency priority queue for verified voice traffic. The observable check is: Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

Incorrect Answers

A:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. 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.

B:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. 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.

D:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. 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 679

An engineering reviewer needs objective proof for the following: Voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. 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. Congestion tests show each class receives at least its configured effective share where the scheduler applies.
  4. Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

Explanation

Correct Answer

D:

Under a mixed-load test, voice delay remains low and nonvoice classes still receive service. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others.

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, a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The necessary acceptance evidence is: Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. In the case being tested, a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The necessary acceptance evidence is: Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

C:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. In the case being tested, a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The necessary acceptance evidence is: Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

Question 680

The change advisory board sees a repeat risk in this case: Voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Enforce priority admission limits and authenticate high-priority marking sources.
  2. Use provider class mapping tables and test end-to-end during new circuit acceptance.
  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

A:

Enforce priority admission limits and authenticate high-priority marking sources. This control targets the underlying design risk. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The follow-up acceptance check remains: Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.

Incorrect Answers

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. A directly relevant preventive control is: Enforce priority admission limits and authenticate high-priority marking sources.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The repeat risk here is different: a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. A directly relevant preventive control is: Enforce priority admission limits and authenticate high-priority marking sources.

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: a priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. A directly relevant preventive control is: Enforce priority admission limits and authenticate high-priority marking sources.