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Exam Code: 300-420

Exam Name Designing Cisco Enterprise Networks (ENSLD)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Cisco 300-420 Practice Test 79

Question 780

A preventive architecture review covers this situation: During a predeployment review for a financial trading campus, the team discovers this design gap: a financial multicast application has many active sources and receivers that must share identical data without unnecessary source-specific state in the core. 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. Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.
  2. Test designated-forwarder election and RP failure behavior in the bidirectional domain. Apply the same control to the financial trading campus rollout checklist.
  3. Filter and monitor MSDP source-active advertisements to limit unintended sources.
  4. Audit group ranges, IGMP version and device support before converting ASM services to SSM.

Explanation

Correct Answer

B:

Test designated-forwarder election and RP failure behavior in the bidirectional domain. Apply the same control to the financial trading campus rollout checklist. This control targets the underlying design risk. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The follow-up acceptance check remains: Multiple approved senders reach receivers over the intended shared tree at planned scale. The financial trading campus acceptance record also captures this result.

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: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. A directly relevant preventive control is: Test designated-forwarder election and RP failure behavior in the bidirectional domain. Apply the same control to the financial trading campus rollout checklist.

C:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The repeat risk here is different: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. A directly relevant preventive control is: Test designated-forwarder election and RP failure behavior in the bidirectional domain. Apply the same control to the financial trading campus rollout checklist.

D:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The repeat risk here is different: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. A directly relevant preventive control is: Test designated-forwarder election and RP failure behavior in the bidirectional domain. Apply the same control to the financial trading campus rollout checklist.

Question 781

A new campus or WAN review presents this constraint: Two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. Which action MOST DIRECTLY meets the stated design requirement?

  1. Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.
  2. Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.
  3. Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.
  4. Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

Explanation

Correct Answer

D:

Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required. This action addresses the stated design problem. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A practical confirmation is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.

Incorrect Answers

A:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The actual fault is governed by a different mechanism: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The needed response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The actual fault is governed by a different mechanism: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The needed response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

C:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The actual fault is governed by a different mechanism: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The needed response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

Question 782

For this Cisco ENSLD design case: Two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. Which technical principle BEST explains the design decision?

  1. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency.
  2. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.
  3. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  4. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.

Explanation

Correct Answer

A:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The correct engineering response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required. The observable check is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.

Incorrect Answers

B:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. 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:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The offered choice instead concerns a different principle: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. Those technical conditions are not interchangeable.

D:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. 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 783

During acceptance testing for this network design: Two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. Which acceptance observation BEST establishes the intended result?

  1. Multiple approved senders reach receivers over the intended shared tree at planned scale.
  2. An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.
  3. Receivers join only the expected (source,group) stream and unwanted sources do not appear.
  4. Peak-period loss, queue occupancy and jitter meet requirements after the policy change.

Explanation

Correct Answer

B:

An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency.

Incorrect Answers

A:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. In the case being tested, MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The necessary acceptance evidence is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.

C:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. In the case being tested, MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The necessary acceptance evidence is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.

D:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. In the case being tested, MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The necessary acceptance evidence is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.

Question 784

Operations wants to avoid recurrence of this design flaw: Two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.
  2. Audit group ranges, IGMP version and device support before converting ASM services to SSM.
  3. Filter and monitor MSDP source-active advertisements to limit unintended sources.
  4. Validate receiver protocol version with application owners before SSM migration.

Explanation

Correct Answer

C:

Filter and monitor MSDP source-active advertisements to limit unintended sources. This control targets the underlying design risk. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The follow-up acceptance check remains: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.

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: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A directly relevant preventive control is: Filter and monitor MSDP source-active advertisements to limit unintended sources.

B:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The repeat risk here is different: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A directly relevant preventive control is: Filter and monitor MSDP source-active advertisements to limit unintended sources.

D:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The repeat risk here is different: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A directly relevant preventive control is: Filter and monitor MSDP source-active advertisements to limit unintended sources.

Question 785

A Cisco enterprise designer reviews the following scenario: During a predeployment review for a hospital regional backbone, the team discovers this design gap: two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.
  2. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.
  3. Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.
  4. Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.

Explanation

Correct Answer

A:

Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required. This action addresses the stated design problem. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A practical confirmation is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone acceptance record also captures this result.

Incorrect Answers

B:

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: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The needed response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

C:

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: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The needed response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

D:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The actual fault is governed by a different mechanism: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The needed response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

Question 786

The network architecture board discusses the following: During a predeployment review for a hospital regional backbone, the team discovers this design gap: two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. 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. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency.
  3. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.
  4. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.

Explanation

Correct Answer

B:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The correct engineering response is: Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required. The observable check is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone 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 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:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. 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:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The offered choice instead concerns a different principle: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. Those technical conditions are not interchangeable.

Question 787

The infrastructure team must validate this situation: During a predeployment review for a hospital regional backbone, the team discovers this design gap: two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Receiver membership state identifies the intended source and the multicast stream is delivered.
  2. Multiple approved senders reach receivers over the intended shared tree at planned scale.
  3. An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone acceptance record also captures this result.
  4. Receivers join only the expected (source,group) stream and unwanted sources do not appear.

Explanation

Correct Answer

C:

An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone acceptance record also captures this result. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency.

Incorrect Answers

A:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. In the case being tested, MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The necessary acceptance evidence is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone acceptance record also captures this result.

B:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. In the case being tested, MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The necessary acceptance evidence is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone acceptance record also captures this result.

D:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. In the case being tested, MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The necessary acceptance evidence is: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone acceptance record also captures this result.

Question 788

A post-incident design review discusses the following: During a predeployment review for a hospital regional backbone, the team discovers this design gap: two separately managed PIM sparse-mode domains must exchange active source information for ASM groups. 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. Audit group ranges, IGMP version and device support before converting ASM services to SSM.
  2. Validate receiver protocol version with application owners before SSM migration.
  3. Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.
  4. Filter and monitor MSDP source-active advertisements to limit unintended sources. Apply the same control to the hospital regional backbone rollout checklist.

Explanation

Correct Answer

D:

Filter and monitor MSDP source-active advertisements to limit unintended sources. Apply the same control to the hospital regional backbone rollout checklist. This control targets the underlying design risk. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The follow-up acceptance check remains: An eligible source announced in one domain becomes discoverable and reachable to receivers in the other. The hospital regional backbone acceptance record also captures this result.

Incorrect Answers

A:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The repeat risk here is different: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A directly relevant preventive control is: Filter and monitor MSDP source-active advertisements to limit unintended sources. Apply the same control to the hospital regional backbone rollout checklist.

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The repeat risk here is different: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A directly relevant preventive control is: Filter and monitor MSDP source-active advertisements to limit unintended sources. Apply the same control to the hospital regional backbone rollout checklist.

C:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The repeat risk here is different: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. A directly relevant preventive control is: Filter and monitor MSDP source-active advertisements to limit unintended sources. Apply the same control to the hospital regional backbone rollout checklist.

Question 789

During a network design workshop, the team finds this issue: A multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.
  2. Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.
  3. Classify and provide bounded bandwidth priority for required management-plane protocols.
  4. Use authenticated encrypted collection paths and a segmented management architecture instead of unrestricted Internet exposure.

Explanation

Correct Answer

B:

Deliver a supported multicast stream with correct routing and group membership where network and applications permit it. This action addresses the stated design problem. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. A practical confirmation is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.

Incorrect Answers

A:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The actual fault is governed by a different mechanism: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The needed response is: Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.

C:

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: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The needed response is: Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.

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: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The needed response is: Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.

Question 790

In a technical design review: A multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. Which technical principle BEST explains the design decision?

  1. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.
  2. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.
  3. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.
  4. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.

Explanation

Correct Answer

C:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The correct engineering response is: Deliver a supported multicast stream with correct routing and group membership where network and applications permit it. The observable check is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.

Incorrect Answers

A:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. 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.

B:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The offered choice instead concerns a different principle: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. Those technical conditions are not interchangeable.

D:

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