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

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Cisco 300-420 Practice Test 73

Question 720

Operations wants to avoid recurrence of this design flaw: An outage might isolate the production routing domain, but engineers still need access to device consoles. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. List critical management applications and size reserved bandwidth under worst-case load.
  2. Review management ACLs, AAA and break-glass access in each security audit.
  3. Test OOB power and link diversity rather than assuming independence from the primary WAN.
  4. Test shared-service failure domains in the disaster-recovery architecture.

Explanation

Correct Answer

C:

Test OOB power and link diversity rather than assuming independence from the primary WAN. This control targets the underlying design risk. OOB management can remain accessible when an in-band production network or routing plane fails. The follow-up acceptance check remains: During an induced production outage, an authorized operator reaches device console or management endpoints through OOB.

Incorrect Answers

A:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The repeat risk here is different: OOB management can remain accessible when an in-band production network or routing plane fails. A directly relevant preventive control is: Test OOB power and link diversity rather than assuming independence from the primary WAN.

B:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The repeat risk here is different: OOB management can remain accessible when an in-band production network or routing plane fails. A directly relevant preventive control is: Test OOB power and link diversity rather than assuming independence from the primary WAN.

D:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The repeat risk here is different: OOB management can remain accessible when an in-band production network or routing plane fails. A directly relevant preventive control is: Test OOB power and link diversity rather than assuming independence from the primary WAN.

Question 721

A Cisco enterprise designer reviews the following scenario: During a predeployment review for an enterprise services hub, the team discovers this design gap: an outage might isolate the production routing domain, but engineers still need access to device consoles. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design physically or logically separate out-of-band management access with independent reachability.
  2. Classify and provide bounded bandwidth priority for required management-plane protocols.
  3. Use authenticated encrypted collection paths and a segmented management architecture instead of unrestricted Internet exposure.
  4. Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.

Explanation

Correct Answer

A:

Design physically or logically separate out-of-band management access with independent reachability. This action addresses the stated design problem. OOB management can remain accessible when an in-band production network or routing plane fails. A practical confirmation is: During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result.

Incorrect Answers

B:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The actual fault is governed by a different mechanism: OOB management can remain accessible when an in-band production network or routing plane fails. The needed response is: Design physically or logically separate out-of-band management access with independent reachability.

C:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. The actual fault is governed by a different mechanism: OOB management can remain accessible when an in-band production network or routing plane fails. The needed response is: Design physically or logically separate out-of-band management access with independent reachability.

D:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The actual fault is governed by a different mechanism: OOB management can remain accessible when an in-band production network or routing plane fails. The needed response is: Design physically or logically separate out-of-band management access with independent reachability.

Question 722

The network architecture board discusses the following: During a predeployment review for an enterprise services hub, the team discovers this design gap: an outage might isolate the production routing domain, but engineers still need access to device consoles. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.
  2. OOB management can remain accessible when an in-band production network or routing plane fails.
  3. Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries.
  4. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy.

Explanation

Correct Answer

B:

OOB management can remain accessible when an in-band production network or routing plane fails. The correct engineering response is: Design physically or logically separate out-of-band management access with independent reachability. The observable check is: During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result.

Incorrect Answers

A:

OOB management can remain accessible when an in-band production network or routing plane fails. The offered choice instead concerns a different principle: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. Those technical conditions are not interchangeable.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. The offered choice instead concerns a different principle: Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. Those technical conditions are not interchangeable.

D:

OOB management can remain accessible when an in-band production network or routing plane fails. The offered choice instead concerns a different principle: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. Those technical conditions are not interchangeable.

Question 723

The infrastructure team must validate this situation: During a predeployment review for an enterprise services hub, the team discovers this design gap: an outage might isolate the production routing domain, but engineers still need access to device consoles. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.
  2. Only authorized sites and administrators can establish collector sessions and logs show approved sources.
  3. During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result.
  4. During loss of the primary services site, required DNS, monitoring and administration remain available.

Explanation

Correct Answer

C:

During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result. OOB management can remain accessible when an in-band production network or routing plane fails.

Incorrect Answers

A:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. In the case being tested, OOB management can remain accessible when an in-band production network or routing plane fails. The necessary acceptance evidence is: During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result.

B:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. In the case being tested, OOB management can remain accessible when an in-band production network or routing plane fails. The necessary acceptance evidence is: During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result.

D:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. In the case being tested, OOB management can remain accessible when an in-band production network or routing plane fails. The necessary acceptance evidence is: During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result.

Question 724

A post-incident design review discusses the following: During a predeployment review for an enterprise services hub, the team discovers this design gap: an outage might isolate the production routing domain, but engineers still need access to device consoles. 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. Test shared-service failure domains in the disaster-recovery architecture.
  2. Maintain collector certificates, ACL inventories and retention rules in the management standard.
  3. Review management ACLs, AAA and break-glass access in each security audit.
  4. Test OOB power and link diversity rather than assuming independence from the primary WAN. Apply the same control to the enterprise services hub rollout checklist.

Explanation

Correct Answer

D:

Test OOB power and link diversity rather than assuming independence from the primary WAN. Apply the same control to the enterprise services hub rollout checklist. This control targets the underlying design risk. OOB management can remain accessible when an in-band production network or routing plane fails. The follow-up acceptance check remains: During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. The enterprise services hub acceptance record also captures this result.

Incorrect Answers

A:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The repeat risk here is different: OOB management can remain accessible when an in-band production network or routing plane fails. A directly relevant preventive control is: Test OOB power and link diversity rather than assuming independence from the primary WAN. Apply the same control to the enterprise services hub rollout checklist.

B:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. The repeat risk here is different: OOB management can remain accessible when an in-band production network or routing plane fails. A directly relevant preventive control is: Test OOB power and link diversity rather than assuming independence from the primary WAN. Apply the same control to the enterprise services hub rollout checklist.

C:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The repeat risk here is different: OOB management can remain accessible when an in-band production network or routing plane fails. A directly relevant preventive control is: Test OOB power and link diversity rather than assuming independence from the primary WAN. Apply the same control to the enterprise services hub rollout checklist.

Question 725

During a network design workshop, the team finds this issue: Remote management traffic is regularly delayed by a large software-image transfer over a narrow WAN circuit. Which action MOST DIRECTLY meets the stated design requirement?

  1. Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.
  2. Classify and provide bounded bandwidth priority for required management-plane protocols.
  3. Design physically or logically separate out-of-band management access with independent reachability.
  4. Use authenticated encrypted collection paths and a segmented management architecture instead of unrestricted Internet exposure.

Explanation

Correct Answer

B:

Classify and provide bounded bandwidth priority for required management-plane protocols. This action addresses the stated design problem. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. A practical confirmation is: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

Incorrect Answers

A:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The actual fault is governed by a different mechanism: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The needed response is: Classify and provide bounded bandwidth priority for required management-plane protocols.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. The actual fault is governed by a different mechanism: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The needed response is: Classify and provide bounded bandwidth priority for required management-plane protocols.

D:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. The actual fault is governed by a different mechanism: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The needed response is: Classify and provide bounded bandwidth priority for required management-plane protocols.

Question 726

In a technical design review: Remote management traffic is regularly delayed by a large software-image transfer over a narrow WAN circuit. Which technical principle BEST explains the design decision?

  1. OOB management can remain accessible when an in-band production network or routing plane fails.
  2. Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries.
  3. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy.
  4. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.

Explanation

Correct Answer

C:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The correct engineering response is: Classify and provide bounded bandwidth priority for required management-plane protocols. The observable check is: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

Incorrect Answers

A:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The offered choice instead concerns a different principle: OOB management can remain accessible when an in-band production network or routing plane fails. Those technical conditions are not interchangeable.

B:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The offered choice instead concerns a different principle: Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. Those technical conditions are not interchangeable.

D:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The offered choice instead concerns a different principle: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. Those technical conditions are not interchangeable.

Question 727

An engineering reviewer needs objective proof for the following: Remote management traffic is regularly delayed by a large software-image transfer over a narrow WAN circuit. Which acceptance observation BEST establishes the intended result?

  1. During an induced production outage, an authorized operator reaches device console or management endpoints through OOB.
  2. Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.
  3. During loss of the primary services site, required DNS, monitoring and administration remain available.
  4. SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

Explanation

Correct Answer

D:

SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy.

Incorrect Answers

A:

OOB management can remain accessible when an in-band production network or routing plane fails. In the case being tested, Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The necessary acceptance evidence is: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

B:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. In the case being tested, Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The necessary acceptance evidence is: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

C:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. In the case being tested, Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The necessary acceptance evidence is: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

Question 728

The change advisory board sees a repeat risk in this case: Remote management traffic is regularly delayed by a large software-image transfer over a narrow WAN circuit. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. List critical management applications and size reserved bandwidth under worst-case load.
  2. Test OOB power and link diversity rather than assuming independence from the primary WAN.
  3. Test shared-service failure domains in the disaster-recovery architecture.
  4. Include source-path routing changes in multicast outage and maintenance drills.

Explanation

Correct Answer

A:

List critical management applications and size reserved bandwidth under worst-case load. This control targets the underlying design risk. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The follow-up acceptance check remains: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

Incorrect Answers

B:

OOB management can remain accessible when an in-band production network or routing plane fails. The repeat risk here is different: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. A directly relevant preventive control is: List critical management applications and size reserved bandwidth under worst-case load.

C:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The repeat risk here is different: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. A directly relevant preventive control is: List critical management applications and size reserved bandwidth under worst-case load.

D:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The repeat risk here is different: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. A directly relevant preventive control is: List critical management applications and size reserved bandwidth under worst-case load.

Question 729

A design team must resolve this enterprise network problem: During a predeployment review for a financial trading campus, the team discovers this design gap: remote management traffic is regularly delayed by a large software-image transfer over a narrow WAN circuit. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design physically or logically separate out-of-band management access with independent reachability.
  2. Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.
  3. Classify and provide bounded bandwidth priority for required management-plane protocols.
  4. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

Explanation

Correct Answer

C:

Classify and provide bounded bandwidth priority for required management-plane protocols. This action addresses the stated design problem. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. A practical confirmation is: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers. The financial trading campus acceptance record also captures this result.

Incorrect Answers

A:

OOB management can remain accessible when an in-band production network or routing plane fails. The actual fault is governed by a different mechanism: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The needed response is: Classify and provide bounded bandwidth priority for required management-plane protocols.

B:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The actual fault is governed by a different mechanism: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The needed response is: Classify and provide bounded bandwidth priority for required management-plane protocols.

D:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The actual fault is governed by a different mechanism: Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The needed response is: Classify and provide bounded bandwidth priority for required management-plane protocols.

Question 730

The design record describes this issue: During a predeployment review for a financial trading campus, the team discovers this design gap: remote management traffic is regularly delayed by a large software-image transfer over a narrow WAN circuit. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. OOB management can remain accessible when an in-band production network or routing plane fails.
  2. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.
  3. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  4. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy.

Explanation

Correct Answer

D:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The correct engineering response is: Classify and provide bounded bandwidth priority for required management-plane protocols. The observable check is: SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers. The financial trading campus acceptance record also captures this result.

Incorrect Answers

A:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The offered choice instead concerns a different principle: OOB management can remain accessible when an in-band production network or routing plane fails. Those technical conditions are not interchangeable.

B:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The offered choice instead concerns a different principle: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. Those technical conditions are not interchangeable.

C:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. 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.