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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 67

Question 660

A post-incident design review discusses the following: During a predeployment review for a high-volume retail campus, the team discovers this design gap: an application marks traffic correctly at the LAN edge but a WAN provider rewrites all DSCP values. 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. Specify trusted and untrusted marking boundaries in the QoS design.
  2. Document service class allocations and retest after link-rate changes.
  3. Instrument congestion counters and test representative burst profiles before acceptance.
  4. Use provider class mapping tables and test end-to-end during new circuit acceptance. Apply the same control to the high-volume retail campus rollout checklist.

Explanation

Correct Answer

D:

Use provider class mapping tables and test end-to-end during new circuit acceptance. Apply the same control to the high-volume retail campus rollout checklist. This control targets the underlying design risk. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The follow-up acceptance check remains: The intended markings or provider classes are visible on both sides of the WAN demarcation. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The repeat risk here is different: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. A directly relevant preventive control is: Use provider class mapping tables and test end-to-end during new circuit acceptance. Apply the same control to the high-volume retail campus rollout checklist.

B:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The repeat risk here is different: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. A directly relevant preventive control is: Use provider class mapping tables and test end-to-end during new circuit acceptance. Apply the same control to the high-volume retail campus rollout checklist.

C:

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

Question 661

During a network design workshop, the team finds this issue: A 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. 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. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.
  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

B:

Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck. This action addresses the stated design problem. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A practical confirmation is: Provider policer drops decrease and application throughput settles near the planned service rate.

Incorrect Answers

A:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The actual fault is governed by a different mechanism: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The needed response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

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: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The needed response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

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: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The needed response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

Question 662

In a technical design review: A 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. 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. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.
  4. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.

Explanation

Correct Answer

C:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The correct engineering response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck. The observable check is: Provider policer drops decrease and application throughput settles near the planned service rate.

Incorrect Answers

A:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. 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:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. 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:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. 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 663

An engineering reviewer needs objective proof for the following: A 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. 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. Peak-period loss, queue occupancy and jitter meet requirements after the policy change.
  3. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.
  4. Provider policer drops decrease and application throughput settles near the planned service rate.

Explanation

Correct Answer

D:

Provider policer drops decrease and application throughput settles near the planned service rate. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.

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, Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The necessary acceptance evidence is: Provider policer drops decrease and application throughput settles near the planned service rate.

B:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. In the case being tested, Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The necessary acceptance evidence is: Provider policer drops decrease and application throughput settles near the planned service rate.

C:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. In the case being tested, Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The necessary acceptance evidence is: Provider policer drops decrease and application throughput settles near the planned service rate.

Question 664

The change advisory board sees a repeat risk in this case: A 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. 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. 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

A:

Align shaping rates with provider CIR and include encapsulation overhead during capacity planning. This control targets the underlying design risk. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The follow-up acceptance check remains: Provider policer drops decrease and application throughput settles near the planned service rate.

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: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A directly relevant preventive control is: Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The repeat risk here is different: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A directly relevant preventive control is: Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.

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: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A directly relevant preventive control is: Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.

Question 665

A design team must resolve this enterprise network problem: During a predeployment review for a logistics control network, the team discovers this design gap: a 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. 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. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.
  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

C:

Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck. This action addresses the stated design problem. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A practical confirmation is: Provider policer drops decrease and application throughput settles near the planned service rate. The logistics control network 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 actual fault is governed by a different mechanism: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The needed response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

B:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The actual fault is governed by a different mechanism: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The needed response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

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: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The needed response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

Question 666

The design record describes this issue: During a predeployment review for a logistics control network, the team discovers this design gap: a 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.
  2. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.
  3. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  4. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.

Explanation

Correct Answer

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The correct engineering response is: Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck. The observable check is: Provider policer drops decrease and application throughput settles near the planned service rate. The logistics control 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 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.

B:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. 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:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. 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 667

After designing a change for the following scenario: During a predeployment review for a logistics control network, the team discovers this design gap: a 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. 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. The logistics control network acceptance record also captures this result.
  2. Under a mixed-load test, voice delay remains low and nonvoice classes still receive service.
  3. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.
  4. The intended markings or provider classes are visible on both sides of the WAN demarcation.

Explanation

Correct Answer

A:

Provider policer drops decrease and application throughput settles near the planned service rate. The logistics control network acceptance record also captures this result. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.

Incorrect Answers

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, Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The necessary acceptance evidence is: Provider policer drops decrease and application throughput settles near the planned service rate. The logistics control network 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, Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The necessary acceptance evidence is: Provider policer drops decrease and application throughput settles near the planned service rate. The logistics control network acceptance record also captures this result.

D:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. In the case being tested, Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The necessary acceptance evidence is: Provider policer drops decrease and application throughput settles near the planned service rate. The logistics control network acceptance record also captures this result.

Question 668

A preventive architecture review covers this situation: During a predeployment review for a logistics control network, the team discovers this design gap: a 100-Mbps customer handoff feeds a contracted 40-Mbps provider service and bursts are being dropped upstream. 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. Align shaping rates with provider CIR and include encapsulation overhead during capacity planning. Apply the same control to the logistics control network rollout checklist.
  3. Reassess policer burst settings whenever the access circuit size changes.
  4. Specify trusted and untrusted marking boundaries in the QoS design.

Explanation

Correct Answer

B:

Align shaping rates with provider CIR and include encapsulation overhead during capacity planning. Apply the same control to the logistics control network rollout checklist. This control targets the underlying design risk. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The follow-up acceptance check remains: Provider policer drops decrease and application throughput settles near the planned service rate. The logistics control 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: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A directly relevant preventive control is: Align shaping rates with provider CIR and include encapsulation overhead during capacity planning. Apply the same control to the logistics control network rollout checklist.

C:

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: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A directly relevant preventive control is: Align shaping rates with provider CIR and include encapsulation overhead during capacity planning. Apply the same control to the logistics control network rollout checklist.

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The repeat risk here is different: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. A directly relevant preventive control is: Align shaping rates with provider CIR and include encapsulation overhead during capacity planning. Apply the same control to the logistics control network rollout checklist.

Question 669

A new campus or WAN review presents this constraint: A guest Internet service must never exceed a fixed traffic ceiling and excess packets may be dropped or remarked. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use class-based weighted fair queuing with planned per-class bandwidth allocations.
  2. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.
  3. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  4. Use an appropriate traffic policer at the guest policy boundary.

Explanation

Correct Answer

D:

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.

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: 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.

B:

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

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.