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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 81

Question 800

Operations wants to avoid recurrence of this design flaw: The network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.
  2. Filter and monitor MSDP source-active advertisements to limit unintended sources.
  3. Validate receiver protocol version with application owners before SSM migration.
  4. Test OOB power and link diversity rather than assuming independence from the primary WAN.

Explanation

Correct Answer

C:

Validate receiver protocol version with application owners before SSM migration. This control targets the underlying design risk. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The follow-up acceptance check remains: Receiver membership state identifies the intended source and the multicast stream is delivered.

Incorrect Answers

A:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The repeat risk here is different: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. A directly relevant preventive control is: Validate receiver protocol version with application owners before SSM migration.

B:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The repeat risk here is different: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. A directly relevant preventive control is: Validate receiver protocol version with application owners before SSM migration.

D:

OOB management can remain accessible when an in-band production network or routing plane fails. The repeat risk here is different: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. A directly relevant preventive control is: Validate receiver protocol version with application owners before SSM migration.

Question 801

A Cisco enterprise designer reviews the following scenario: During a predeployment review for a high-volume retail campus, the team discovers this design gap: the network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.
  2. Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.
  3. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.
  4. Classify and provide bounded bandwidth priority for required management-plane protocols.

Explanation

Correct Answer

A:

Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection. This action addresses the stated design problem. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. A practical confirmation is: Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

B:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The actual fault is governed by a different mechanism: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The needed response is: Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.

C:

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: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The needed response is: Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.

D:

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: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The needed response is: Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.

Question 802

The network architecture board discusses the following: During a predeployment review for a high-volume retail campus, the team discovers this design gap: the network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.
  2. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  3. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.
  4. Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries.

Explanation

Correct Answer

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The correct engineering response is: Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection. The observable check is: Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

A:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The offered choice instead concerns a different principle: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. Those technical conditions are not interchangeable.

C:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The offered choice instead concerns a different principle: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. Those technical conditions are not interchangeable.

D:

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

Question 803

The infrastructure team must validate this situation: During a predeployment review for a high-volume retail campus, the team discovers this design gap: the network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Receivers join only the expected (source,group) stream and unwanted sources do not appear.
  2. Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.
  3. Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result.
  4. Multiple approved senders reach receivers over the intended shared tree at planned scale.

Explanation

Correct Answer

C:

Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.

Incorrect Answers

A:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. In the case being tested, SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The necessary acceptance evidence is: Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result.

B:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. In the case being tested, SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The necessary acceptance evidence is: Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result.

D:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. In the case being tested, SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The necessary acceptance evidence is: Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result.

Question 804

A post-incident design review discusses the following: During a predeployment review for a high-volume retail campus, the team discovers this design gap: the network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. 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. Filter and monitor MSDP source-active advertisements to limit unintended sources.
  2. Test designated-forwarder election and RP failure behavior in the bidirectional domain.
  3. Audit group ranges, IGMP version and device support before converting ASM services to SSM.
  4. Validate receiver protocol version with application owners before SSM migration. Apply the same control to the high-volume retail campus rollout checklist.

Explanation

Correct Answer

D:

Validate receiver protocol version with application owners before SSM migration. Apply the same control to the high-volume retail campus rollout checklist. This control targets the underlying design risk. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The follow-up acceptance check remains: Receiver membership state identifies the intended source and the multicast stream is delivered. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

A:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The repeat risk here is different: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. A directly relevant preventive control is: Validate receiver protocol version with application owners before SSM migration. Apply the same control to the high-volume retail campus rollout checklist.

B:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The repeat risk here is different: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. A directly relevant preventive control is: Validate receiver protocol version with application owners before SSM migration. Apply the same control to the high-volume retail campus rollout checklist.

C:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The repeat risk here is different: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. A directly relevant preventive control is: Validate receiver protocol version with application owners before SSM migration. Apply the same control to the high-volume retail campus rollout checklist.

Question 805

During a network design workshop, the team finds this issue: A network services design centralizes syslog, SNMP and DNS on one inaccessible site while disaster-recovery connectivity depends on those services. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use authenticated encrypted collection paths and a segmented management architecture instead of unrestricted Internet exposure.
  2. Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.
  3. Separate management reachability into an appropriate management VRF or dedicated management network with restricted access.
  4. Use class-based weighted fair queuing with planned per-class bandwidth allocations.

Explanation

Correct Answer

B:

Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain. This action addresses the stated design problem. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. A practical confirmation is: During loss of the primary services site, required DNS, monitoring and administration remain available.

Incorrect Answers

A:

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: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The needed response is: Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.

C:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The actual fault is governed by a different mechanism: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The needed response is: Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.

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: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The needed response is: Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.

Question 806

In a technical design review: A network services design centralizes syslog, SNMP and DNS on one inaccessible site while disaster-recovery connectivity depends on those services. 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. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.
  4. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.

Explanation

Correct Answer

C:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The correct engineering response is: Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain. The observable check is: During loss of the primary services site, required DNS, monitoring and administration remain available.

Incorrect Answers

A:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. 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:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. 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:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. 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.

Question 807

An engineering reviewer needs objective proof for the following: A network services design centralizes syslog, SNMP and DNS on one inaccessible site while disaster-recovery connectivity depends on those services. Which acceptance observation BEST establishes the intended result?

  1. Only authorized sites and administrators can establish collector sessions and logs show approved sources.
  2. Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.
  3. Multiple approved senders reach receivers over the intended shared tree at planned scale.
  4. During loss of the primary services site, required DNS, monitoring and administration remain available.

Explanation

Correct Answer

D:

During loss of the primary services site, required DNS, monitoring and administration remain available. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.

Incorrect Answers

A:

Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. In the case being tested, Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The necessary acceptance evidence is: During loss of the primary services site, required DNS, monitoring and administration remain available.

B:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. In the case being tested, Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The necessary acceptance evidence is: During loss of the primary services site, required DNS, monitoring and administration remain available.

C:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. In the case being tested, Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The necessary acceptance evidence is: During loss of the primary services site, required DNS, monitoring and administration remain available.

Question 808

The change advisory board sees a repeat risk in this case: A network services design centralizes syslog, SNMP and DNS on one inaccessible site while disaster-recovery connectivity depends on those services. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test shared-service failure domains in the disaster-recovery architecture.
  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. Test designated-forwarder election and RP failure behavior in the bidirectional domain.

Explanation

Correct Answer

A:

Test shared-service failure domains in the disaster-recovery architecture. This control targets the underlying design risk. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The follow-up acceptance check remains: During loss of the primary services site, required DNS, monitoring and administration remain available.

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: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. A directly relevant preventive control is: Test shared-service failure domains in the disaster-recovery architecture.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. The repeat risk here is different: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. A directly relevant preventive control is: Test shared-service failure domains in the disaster-recovery architecture.

D:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The repeat risk here is different: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. A directly relevant preventive control is: Test shared-service failure domains in the disaster-recovery architecture.

Question 809

A design team must resolve this enterprise network problem: A multivendor automation team wants a vendor-neutral interface schema for common BGP and interface configuration. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.
  2. Distinguish standards-track IETF models from vendor-native models by their published module identity and ownership.
  3. Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations.
  4. Discover and validate implemented model revisions and capabilities before composing the payload.

Explanation

Correct Answer

C:

Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations. This action addresses the stated design problem. OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. A practical confirmation is: The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.

Incorrect Answers

A:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The actual fault is governed by a different mechanism: OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The needed response is: Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations.

B:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. The actual fault is governed by a different mechanism: OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The needed response is: Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations.

D:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The actual fault is governed by a different mechanism: OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The needed response is: Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations.

Question 810

The design record describes this issue: A multivendor automation team wants a vendor-neutral interface schema for common BGP and interface configuration. Which technical principle BEST explains the design decision?

  1. IETF YANG models standardize common semantics independently of a vendor’s native extension models.
  2. Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema.
  3. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged.
  4. OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation.

Explanation

Correct Answer

D:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The correct engineering response is: Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations. The observable check is: The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.

Incorrect Answers

A:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The offered choice instead concerns a different principle: IETF YANG models standardize common semantics independently of a vendor’s native extension models. Those technical conditions are not interchangeable.

B:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The offered choice instead concerns a different principle: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. Those technical conditions are not interchangeable.

C:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The offered choice instead concerns a different principle: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. Those technical conditions are not interchangeable.