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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 78

Question 770

The network architecture board discusses the following: During a predeployment review for an enterprise services hub, the team discovers this design gap: an enterprise carries one known authorized video source per group and wants to avoid RP-related source discovery overhead. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.
  3. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  4. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.

Explanation

Correct Answer

B:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The correct engineering response is: Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing. The observable check is: Receivers join only the expected (source,group) stream and unwanted sources do not appear. The enterprise services hub 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 offered choice instead concerns a different principle: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. Those technical conditions are not interchangeable.

C:

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

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

Question 771

The infrastructure team must validate this situation: During a predeployment review for an enterprise services hub, the team discovers this design gap: an enterprise carries one known authorized video source per group and wants to avoid RP-related source discovery overhead. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

C:

Receivers join only the expected (source,group) stream and unwanted sources do not appear. The enterprise services hub acceptance record also captures this result. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.

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, SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The necessary acceptance evidence is: Receivers join only the expected (source,group) stream and unwanted sources do not appear. The enterprise services hub acceptance record also captures this result.

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. In the case being tested, SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The necessary acceptance evidence is: Receivers join only the expected (source,group) stream and unwanted sources do not appear. The enterprise services hub acceptance record also captures this result.

D:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. In the case being tested, SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The necessary acceptance evidence is: Receivers join only the expected (source,group) stream and unwanted sources do not appear. The enterprise services hub acceptance record also captures this result.

Question 772

A post-incident design review discusses the following: During a predeployment review for an enterprise services hub, the team discovers this design gap: an enterprise carries one known authorized video source per group and wants to avoid RP-related source discovery overhead. 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. Validate receiver protocol version with application owners before SSM migration.
  3. Test designated-forwarder election and RP failure behavior in the bidirectional domain.
  4. Audit group ranges, IGMP version and device support before converting ASM services to SSM. Apply the same control to the enterprise services hub rollout checklist.

Explanation

Correct Answer

D:

Audit group ranges, IGMP version and device support before converting ASM services to SSM. Apply the same control to the enterprise services hub rollout checklist. This control targets the underlying design risk. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The follow-up acceptance check remains: Receivers join only the expected (source,group) stream and unwanted sources do not appear. The enterprise services hub 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: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. A directly relevant preventive control is: Audit group ranges, IGMP version and device support before converting ASM services to SSM. Apply the same control to the enterprise services hub rollout checklist.

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The repeat risk here is different: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. A directly relevant preventive control is: Audit group ranges, IGMP version and device support before converting ASM services to SSM. Apply the same control to the enterprise services hub rollout checklist.

C:

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 identifies a desired source and group and generally does not rely on ASM RP source discovery. A directly relevant preventive control is: Audit group ranges, IGMP version and device support before converting ASM services to SSM. Apply the same control to the enterprise services hub rollout checklist.

Question 773

During a network design workshop, the team finds this issue: A financial multicast application has many active sources and receivers that must share identical data without unnecessary source-specific state in the core. 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. Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.
  3. Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.
  4. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

Explanation

Correct Answer

B:

Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design. This action addresses the stated design problem. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. A practical confirmation is: Multiple approved senders reach receivers over the intended shared tree at planned scale.

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: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The needed response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.

C:

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: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The needed response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.

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: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The needed response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.

Question 774

In a technical design review: A financial multicast application has many active sources and receivers that must share identical data without unnecessary source-specific state in the core. 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. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.
  4. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency.

Explanation

Correct Answer

C:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The correct engineering response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design. The observable check is: Multiple approved senders reach receivers over the intended shared tree at planned scale.

Incorrect Answers

A:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. 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.

B:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. 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:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The offered choice instead concerns a different principle: MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. Those technical conditions are not interchangeable.

Question 775

An engineering reviewer needs objective proof for the following: A financial multicast application has many active sources and receivers that must share identical data without unnecessary source-specific state in the core. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

D:

Multiple approved senders reach receivers over the intended shared tree at planned scale. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.

Incorrect Answers

A:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. In the case being tested, Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The necessary acceptance evidence is: Multiple approved senders reach receivers over the intended shared tree at planned scale.

B:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. In the case being tested, Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The necessary acceptance evidence is: Multiple approved senders reach receivers over the intended shared tree at planned scale.

C:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. In the case being tested, Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The necessary acceptance evidence is: Multiple approved senders reach receivers over the intended shared tree at planned scale.

Question 776

The change advisory board sees a repeat risk in this case: A financial multicast application has many active sources and receivers that must share identical data without unnecessary source-specific state in the core. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test designated-forwarder election and RP failure behavior in the bidirectional domain.
  2. Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.
  3. Validate receiver protocol version with application owners before SSM migration.
  4. Audit RP reachability and redundancy during topology or multicast range changes.

Explanation

Correct Answer

A:

Test designated-forwarder election and RP failure behavior in the bidirectional domain. 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.

Incorrect Answers

B:

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.

C:

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

D:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and 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.

Question 777

A design team must resolve this enterprise network problem: 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 action MOST DIRECTLY meets the stated design requirement?

  1. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.
  2. Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.
  3. Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.
  4. Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.

Explanation

Correct Answer

C:

Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design. This action addresses the stated design problem. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. A practical confirmation is: 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:

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: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The needed response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.

B:

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: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The needed response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.

D:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The actual fault is governed by a different mechanism: Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The needed response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.

Question 778

The design record describes this issue: 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 technical principle BEST explains the design decision?

  1. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  2. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.
  3. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  4. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.

Explanation

Correct Answer

D:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The correct engineering response is: Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design. The observable check is: 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:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. 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.

B:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. 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:

Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. 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.

Question 779

After designing a change for the following scenario: 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 acceptance observation BEST establishes the intended result?

  1. Multiple approved senders reach receivers over the intended shared tree at planned scale. The financial trading campus acceptance record also captures this result.
  2. An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.
  3. Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.
  4. Receiver membership state identifies the intended source and the multicast stream is delivered.

Explanation

Correct Answer

A:

Multiple approved senders reach receivers over the intended shared tree at planned scale. The financial trading campus acceptance record also captures this result. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.

Incorrect Answers

B:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. In the case being tested, Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The necessary acceptance evidence is: Multiple approved senders reach receivers over the intended shared tree at planned scale. The financial trading campus acceptance record also captures this result.

C:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. In the case being tested, Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The necessary acceptance evidence is: Multiple approved senders reach receivers over the intended shared tree at planned scale. The financial trading campus acceptance record also captures this result.

D:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. In the case being tested, Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender. The necessary acceptance evidence is: Multiple approved senders reach receivers over the intended shared tree at planned scale. The financial trading campus acceptance record also captures this result.

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.