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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 72

Question 710

In a technical design review: The enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. Which technical principle BEST explains the design decision?

  1. Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries.
  2. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy.
  3. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.
  4. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.

Explanation

Correct Answer

C:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The correct engineering response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access. The observable check is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

Incorrect Answers

A:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. 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.

B:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. 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.

D:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. 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.

Question 711

An engineering reviewer needs objective proof for the following: The enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. Which acceptance observation BEST establishes the intended result?

  1. SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.
  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.
  4. Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

Explanation

Correct Answer

D:

Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.

Incorrect Answers

A:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. In the case being tested, Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The necessary acceptance evidence is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

B:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. In the case being tested, Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The necessary acceptance evidence is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. In the case being tested, Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The necessary acceptance evidence is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

Question 712

The change advisory board sees a repeat risk in this case: The enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Review management ACLs, AAA and break-glass access in each security audit.
  2. List critical management applications and size reserved bandwidth under worst-case load.
  3. Test OOB power and link diversity rather than assuming independence from the primary WAN.
  4. Maintain collector certificates, ACL inventories and retention rules in the management standard.

Explanation

Correct Answer

A:

Review management ACLs, AAA and break-glass access in each security audit. This control targets the underlying design risk. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The follow-up acceptance check remains: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

Incorrect Answers

B:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The repeat risk here is different: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A directly relevant preventive control is: Review management ACLs, AAA and break-glass access in each security audit.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. The repeat risk here is different: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A directly relevant preventive control is: Review management ACLs, AAA and break-glass access in each security audit.

D:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. The repeat risk here is different: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A directly relevant preventive control is: Review management ACLs, AAA and break-glass access in each security audit.

Question 713

A design team must resolve this enterprise network problem: During a predeployment review for a logistics control network, the team discovers this design gap: the enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. Use authenticated encrypted collection paths and a segmented management architecture instead of unrestricted Internet exposure.
  3. Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.
  4. Design physically or logically separate out-of-band management access with independent reachability.

Explanation

Correct Answer

C:

Separate management reachability into an appropriate management VRF or dedicated management network with restricted access. This action addresses the stated design problem. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A practical confirmation is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. The logistics control network 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 actual fault is governed by a different mechanism: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The needed response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.

B:

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: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The needed response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.

D:

OOB management can remain accessible when an in-band production network or routing plane fails. The actual fault is governed by a different mechanism: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The needed response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.

Question 714

The design record describes this issue: During a predeployment review for a logistics control network, the team discovers this design gap: the enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. 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. 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. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.

Explanation

Correct Answer

D:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The correct engineering response is: Separate management reachability into an appropriate management VRF or dedicated management network with restricted access. The observable check is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. The logistics control network acceptance record also captures this result.

Incorrect Answers

A:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. 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:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. 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.

C:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. 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 715

After designing a change for the following scenario: During a predeployment review for a logistics control network, the team discovers this design gap: the enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. 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. The logistics control network acceptance record also captures this result.
  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.
  4. SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.

Explanation

Correct Answer

A:

Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. The logistics control network acceptance record also captures this result. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.

Incorrect Answers

B:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. In the case being tested, Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The necessary acceptance evidence is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. The logistics control network acceptance record also captures this result.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. In the case being tested, Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The necessary acceptance evidence is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. The logistics control network acceptance record also captures this result.

D:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. In the case being tested, Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The necessary acceptance evidence is: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. The logistics control network acceptance record also captures this result.

Question 716

A preventive architecture review covers this situation: During a predeployment review for a logistics control network, the team discovers this design gap: the enterprise uses its production campus VRF to manage core devices, exposing administration to ordinary user traffic. 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. Maintain collector certificates, ACL inventories and retention rules in the management standard.
  2. Review management ACLs, AAA and break-glass access in each security audit. Apply the same control to the logistics control network rollout checklist.
  3. List critical management applications and size reserved bandwidth under worst-case load.
  4. Test shared-service failure domains in the disaster-recovery architecture.

Explanation

Correct Answer

B:

Review management ACLs, AAA and break-glass access in each security audit. Apply the same control to the logistics control network rollout checklist. This control targets the underlying design risk. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The follow-up acceptance check remains: Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment. The logistics control network acceptance record also captures this result.

Incorrect Answers

A:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. The repeat risk here is different: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A directly relevant preventive control is: Review management ACLs, AAA and break-glass access in each security audit. Apply the same control to the logistics control network rollout checklist.

C:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. The repeat risk here is different: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A directly relevant preventive control is: Review management ACLs, AAA and break-glass access in each security audit. Apply the same control to the logistics control network rollout checklist.

D:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The repeat risk here is different: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. A directly relevant preventive control is: Review management ACLs, AAA and break-glass access in each security audit. Apply the same control to the logistics control network rollout checklist.

Question 717

A new campus or WAN review presents this constraint: An outage might isolate the production routing domain, but engineers still need access to device consoles. Which action MOST DIRECTLY meets the stated design requirement?

  1. Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.
  2. Classify and provide bounded bandwidth priority for required management-plane protocols.
  3. Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.
  4. Design physically or logically separate out-of-band management access with independent reachability.

Explanation

Correct Answer

D:

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.

Incorrect Answers

A:

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.

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:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. 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 718

For this Cisco ENSLD design case: An outage might isolate the production routing domain, but engineers still need access to device consoles. 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. Critical management flows can be protected from starvation by a coherent end-to-end QoS policy.
  4. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.

Explanation

Correct Answer

A:

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.

Incorrect Answers

B:

OOB management can remain accessible when an in-band production network or routing plane fails. 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:

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.

D:

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.

Question 719

During acceptance testing for this network design: An outage might isolate the production routing domain, but engineers still need access to device consoles. 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. During an induced production outage, an authorized operator reaches device console or management endpoints through OOB.
  3. Only authorized sites and administrators can establish collector sessions and logs show approved sources.
  4. Receivers join only the expected (source,group) stream and unwanted sources do not appear.

Explanation

Correct Answer

B:

During an induced production outage, an authorized operator reaches device console or management endpoints through OOB. 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.

C:

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.

D:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. 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.

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.