McAfee Secure

Cisco 300-420 Bundle

Exam Code: 300-420

Exam Name Designing Cisco Enterprise Networks (ENSLD)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

Cisco 300-420 Bundle $25.00
300-420 Sample 1 300-420 Sample 2 300-420 Sample 3 300-420 Sample 4 300-420 Sample 5 300-420 Sample 6 300-420 Sample 7 300-420 Sample 8 300-420 Sample 9 300-420 Sample 10

100% Cisco 300-420 Guaranteed Success With Testking Training Materials

Get Real 300-420 Exam Questions & Expert Verified Answers as Experienced on the Real Exam!

  • Questions & Answers

    300-420 Questions & Answers

    416 Questions & Answers

    The ultimate exam preparation tool, Questions & Answers mirrors the actual 300-420 exam while allowing you to hone and measure every aspect of your test-taking ability.

  • 300-420 Video Course

    300-420 Training Course

    75 Video Lectures

    300-420 Video Course is developed by Cisco Professionals to help you pass the 300-420 exam.

    Description

    This course will improve your knowledge and skills required to pass Designing Cisco Enterprise Networks (ENSLD) exam.

Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests

Satisfaction Guaranteed

Money Back Guarantee

Testking provides hassle-free money back guarantee with our products. That is because we have 100% trust in the abilities of our professional and experience product team, and our record is a proof of that.

99.6% PASS RATE
Total Cost: $164.98
Bundle Price: $139.98

Purchase Individually

  • Questions & Answers

    Questions & Answers

    416 Questions

    $124.99
  • 300-420 Video Course

    Training Course

    75 Video Lectures

    $39.99

Cisco 300-420 Practice Test 66

Question 650

The design record describes this issue: During a predeployment review for a university core network, the team discovers this design gap: employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. 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. 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

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The correct engineering response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags. The observable check is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. The university core network 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 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:

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

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The offered choice instead concerns a different principle: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. Those technical conditions are not interchangeable.

Question 651

After designing a change for the following scenario: During a predeployment review for a university core network, the team discovers this design gap: employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. 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. 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. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

Explanation

Correct Answer

A:

Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. The university core network acceptance record also captures this result. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.

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, an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The necessary acceptance evidence is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. 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, an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The necessary acceptance evidence is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. The university core network acceptance record also captures this result.

D:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. In the case being tested, an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The necessary acceptance evidence is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. The university core network acceptance record also captures this result.

Question 652

A preventive architecture review covers this situation: During a predeployment review for a university core network, the team discovers this design gap: employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. 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. Specify trusted and untrusted marking boundaries in the QoS design. Apply the same control to the university core network rollout checklist.
  3. Document service class allocations and retest after link-rate changes.
  4. Tune early-drop thresholds from actual queue statistics rather than default assumptions.

Explanation

Correct Answer

B:

Specify trusted and untrusted marking boundaries in the QoS design. Apply the same control to the university core network rollout checklist. This control targets the underlying design risk. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The follow-up acceptance check remains: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. The university core 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 repeat risk here is different: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A directly relevant preventive control is: Specify trusted and untrusted marking boundaries in the QoS design. Apply the same control to the university core network 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: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A directly relevant preventive control is: Specify trusted and untrusted marking boundaries in the QoS design. Apply the same control to the university core network rollout checklist.

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: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A directly relevant preventive control is: Specify trusted and untrusted marking boundaries in the QoS design. Apply the same control to the university core network rollout checklist.

Question 653

A new campus or WAN review presents this constraint: An application marks traffic correctly at the LAN edge but a WAN provider rewrites all DSCP values. Which action MOST DIRECTLY meets the stated design requirement?

  1. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.
  2. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  3. Use class-based weighted fair queuing with planned per-class bandwidth allocations.
  4. Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

Explanation

Correct Answer

D:

Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff. This action addresses the stated design problem. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. A practical confirmation is: The intended markings or provider classes are visible on both sides of the WAN demarcation.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The actual fault is governed by a different mechanism: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The needed response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

B:

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: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The needed response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

C:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The actual fault is governed by a different mechanism: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The needed response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

Question 654

For this Cisco ENSLD design case: An application marks traffic correctly at the LAN edge but a WAN provider rewrites all DSCP values. 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. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.
  3. A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others.
  4. Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues.

Explanation

Correct Answer

A:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The correct engineering response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff. The observable check is: The intended markings or provider classes are visible on both sides of the WAN demarcation.

Incorrect Answers

B:

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

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

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. 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 655

During acceptance testing for this network design: An application marks traffic correctly at the LAN edge but a WAN provider rewrites all DSCP values. Which acceptance observation BEST establishes the intended result?

  1. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.
  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. Provider policer drops decrease and application throughput settles near the planned service rate.

Explanation

Correct Answer

B:

The intended markings or provider classes are visible on both sides of the WAN demarcation. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. In the case being tested, End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The necessary acceptance evidence is: The intended markings or provider classes are visible on both sides of the WAN demarcation.

C:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. In the case being tested, End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The necessary acceptance evidence is: The intended markings or provider classes are visible on both sides of the WAN demarcation.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The necessary acceptance evidence is: The intended markings or provider classes are visible on both sides of the WAN demarcation.

Question 656

Operations wants to avoid recurrence of this design flaw: An application marks traffic correctly at the LAN edge but a WAN provider rewrites all DSCP values. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Document service class allocations and retest after link-rate changes.
  2. Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.
  3. Use provider class mapping tables and test end-to-end during new circuit acceptance.
  4. Reassess policer burst settings whenever the access circuit size changes.

Explanation

Correct Answer

C:

Use provider class mapping tables and test end-to-end during new circuit acceptance. 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.

Incorrect Answers

A:

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.

B:

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

D:

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: 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.

Question 657

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

  1. Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.
  2. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  3. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.
  4. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

Explanation

Correct Answer

A:

Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff. This action addresses the stated design problem. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. A practical confirmation is: 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

B:

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: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The needed response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The actual fault is governed by a different mechanism: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The needed response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

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: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The needed response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff.

Question 658

The network architecture board 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 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. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.
  3. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.
  4. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.

Explanation

Correct Answer

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The correct engineering response is: Negotiate and verify the provider CoS mapping, then remark appropriately at the enterprise handoff. The observable check is: 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:

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

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

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The offered choice instead concerns a different principle: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. Those technical conditions are not interchangeable.

Question 659

The infrastructure team must validate this situation: 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 acceptance observation BEST establishes the intended result?

  1. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.
  2. Congestion tests show each class receives at least its configured effective share where the scheduler applies.
  3. 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.
  4. Provider policer drops decrease and application throughput settles near the planned service rate.

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. In the case being tested, End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The necessary acceptance evidence is: 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.

B:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. In the case being tested, End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The necessary acceptance evidence is: 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.

D:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The necessary acceptance evidence is: 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.

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.