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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 69

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.

Question 681

A design team must resolve this enterprise network problem: During a predeployment review for a financial trading campus, the team discovers this design gap: voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.
  2. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.
  3. Provide a bounded low-latency priority queue for verified voice traffic.
  4. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

Explanation

Correct Answer

C:

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. The financial trading campus 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 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.

B:

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

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. 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 682

The design record describes this issue: During a predeployment review for a financial trading campus, the team discovers this design gap: voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  2. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.
  3. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.
  4. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others.

Explanation

Correct Answer

D:

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. The financial trading campus acceptance record also captures this result.

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

C:

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.

Question 683

After designing a change for the following scenario: During a predeployment review for a financial trading campus, the team discovers this design gap: voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Under a mixed-load test, voice delay remains low and nonvoice classes still receive service. The financial trading campus acceptance record also captures this result.
  2. Congestion tests show each class receives at least its configured effective share where the scheduler applies.
  3. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.
  4. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Explanation

Correct Answer

A:

Under a mixed-load test, voice delay remains low and nonvoice classes still receive service. The financial trading campus acceptance record also captures this result. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others.

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, 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. The financial trading campus acceptance record also captures this result.

C:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. 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. The financial trading campus 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, 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. The financial trading campus acceptance record also captures this result.

Question 684

A preventive architecture review covers this situation: During a predeployment review for a financial trading campus, the team discovers this design gap: voice packets compete with bulk file transfers on a low-speed WAN link and experience unacceptable queue delay. 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. Reassess policer burst settings whenever the access circuit size changes.
  2. Enforce priority admission limits and authenticate high-priority marking sources. Apply the same control to the financial trading campus rollout checklist.
  3. Document service class allocations and retest after link-rate changes.
  4. Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.

Explanation

Correct Answer

B:

Enforce priority admission limits and authenticate high-priority marking sources. Apply the same control to the financial trading campus rollout checklist. 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. The financial trading campus 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 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. Apply the same control to the financial trading campus 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: 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. Apply the same control to the financial trading campus 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: 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. Apply the same control to the financial trading campus rollout checklist.

Question 685

A new campus or WAN review presents this constraint: Bulk transactions and routine web data need minimum bandwidth shares during congestion but neither is real-time voice. 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. Provide a bounded low-latency priority queue for verified voice traffic.
  3. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.
  4. Use class-based weighted fair queuing with planned per-class bandwidth allocations.

Explanation

Correct Answer

D:

Use class-based weighted fair queuing with planned per-class bandwidth allocations. This action addresses the stated design problem. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. A practical confirmation is: Congestion tests show each class receives at least its configured effective share where the scheduler applies.

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: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The needed response is: Use class-based weighted fair queuing with planned per-class bandwidth allocations.

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: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The needed response is: Use class-based weighted fair queuing with planned per-class bandwidth allocations.

C:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The actual fault is governed by a different mechanism: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The needed response is: Use class-based weighted fair queuing with planned per-class bandwidth allocations.

Question 686

For this Cisco ENSLD design case: Bulk transactions and routine web data need minimum bandwidth shares during congestion but neither is real-time voice. 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. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.
  3. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.
  4. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.

Explanation

Correct Answer

A:

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.

Incorrect Answers

B:

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: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. 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: 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.

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: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. Those technical conditions are not interchangeable.

Question 687

During acceptance testing for this network design: Bulk transactions and routine web data need minimum bandwidth shares during congestion but neither is real-time voice. Which acceptance observation BEST establishes the intended result?

  1. Provider policer drops decrease and application throughput settles near the planned service rate.
  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. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

Explanation

Correct Answer

B:

Congestion tests show each class receives at least its configured effective share where the scheduler applies. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority 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, 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.

C:

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

D:

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.

Question 688

Operations wants to avoid recurrence of this design flaw: Bulk transactions and routine web data need minimum bandwidth shares during congestion but neither is real-time voice. 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. Tune early-drop thresholds from actual queue statistics rather than default assumptions.
  3. Document service class allocations and retest after link-rate changes.
  4. Use provider class mapping tables and test end-to-end during new circuit acceptance.

Explanation

Correct Answer

C:

Document service class allocations and retest after link-rate changes. 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.

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.

B:

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

D:

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.

Question 689

A Cisco enterprise designer reviews the following scenario: 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 action MOST DIRECTLY meets the stated design requirement?

  1. Use class-based weighted fair queuing with planned per-class bandwidth allocations.
  2. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.
  3. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  4. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

Explanation

Correct Answer

A:

Use class-based weighted fair queuing with planned per-class bandwidth allocations. This action addresses the stated design problem. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. A practical confirmation 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

B:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The actual fault is governed by a different mechanism: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The needed response is: Use class-based weighted fair queuing with planned per-class bandwidth allocations.

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: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The needed response is: Use class-based weighted fair queuing with planned per-class bandwidth allocations.

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: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The needed response is: Use class-based weighted fair queuing with planned per-class bandwidth allocations.

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.