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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 80

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.

Question 791

An engineering reviewer needs objective proof for the following: A multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

D:

Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.

Incorrect Answers

A:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. In the case being tested, Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The necessary acceptance evidence is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. In the case being tested, Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The necessary acceptance evidence is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.

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, Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The necessary acceptance evidence is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.

Question 792

The change advisory board sees a repeat risk in this case: A multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. 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.
  3. Audit group ranges, IGMP version and device support before converting ASM services to SSM.
  4. Filter and monitor MSDP source-active advertisements to limit unintended sources.

Explanation

Correct Answer

A:

Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments. This control targets the underlying design risk. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The follow-up acceptance check remains: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.

Incorrect Answers

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: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. A directly relevant preventive control is: Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.

C:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The repeat risk here is different: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. A directly relevant preventive control is: Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.

D:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The repeat risk here is different: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. A directly relevant preventive control is: Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.

Question 793

A design team must resolve this enterprise network problem: During a predeployment review for a university core network, the team discovers this design gap: a multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. 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 MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.
  3. Deliver a supported multicast stream with correct routing and group membership where network and applications permit it.
  4. Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.

Explanation

Correct Answer

C:

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. The university core network acceptance record also captures this result.

Incorrect Answers

A:

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

B:

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.

D:

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: 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 794

The design record describes this issue: During a predeployment review for a university core network, the team discovers this design gap: a multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. An approval gate requires both a measurable acceptance check and a durable prevention control. 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. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  3. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  4. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.

Explanation

Correct Answer

D:

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. The university core network 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 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: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. Those technical conditions are not interchangeable.

C:

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: 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 795

After designing a change for the following scenario: During a predeployment review for a university core network, the team discovers this design gap: a multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

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

Explanation

Correct Answer

A:

Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies. The university core network acceptance record also captures this result. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.

Incorrect Answers

B:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. In the case being tested, Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The necessary acceptance evidence is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies. The university core network acceptance record also captures this result.

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, Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The necessary acceptance evidence is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies. The university core network 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, Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The necessary acceptance evidence is: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies. The university core network acceptance record also captures this result.

Question 796

A preventive architecture review covers this situation: During a predeployment review for a university core network, the team discovers this design gap: a multicast distribution design pushes separate unicast copies of the same high-bitrate stream to dozens of subscribers. An approval gate requires both a measurable acceptance check and a durable prevention control. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test designated-forwarder election and RP failure behavior in the bidirectional domain.
  2. Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments. Apply the same control to the university core network rollout checklist.
  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.

Explanation

Correct Answer

B:

Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments. Apply the same control to the university core network rollout checklist. This control targets the underlying design risk. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. The follow-up acceptance check remains: Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies. The university core network 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 repeat risk here is different: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. A directly relevant preventive control is: Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments. Apply the same control to the university core network 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: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. A directly relevant preventive control is: Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments. Apply the same control to the university core network rollout checklist.

D:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The repeat risk here is different: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. A directly relevant preventive control is: Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments. Apply the same control to the university core network rollout checklist.

Question 797

A new campus or WAN review presents this constraint: The network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate bidirectional PIM for an appropriate many-to-many deployment and validate RP design.
  2. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.
  3. Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it.
  4. Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.

Explanation

Correct Answer

D:

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.

Incorrect Answers

A:

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.

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: 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:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. 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 798

For this Cisco ENSLD design case: The network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. Which technical principle BEST explains the design decision?

  1. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  2. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.
  3. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.
  4. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.

Explanation

Correct Answer

A:

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.

Incorrect Answers

B:

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

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: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. Those technical conditions are not interchangeable.

Question 799

During acceptance testing for this network design: The network team configures SSM on routers but old receiver clients send only IGMPv2 membership reports. 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. An eligible source announced in one domain becomes discoverable and reachable to receivers in the other.
  4. Queue depth and throughput behavior improve under a controlled congestion test without harming priority traffic.

Explanation

Correct Answer

B:

Receiver membership state identifies the intended source and the multicast stream is delivered. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.

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 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.

C:

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

D:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. 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.

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.