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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 77

Question 760

The change advisory board sees a repeat risk in this case: An engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Use separate source and RP path tests when documenting multicast failover.
  2. Include source-path routing changes in multicast outage and maintenance drills.
  3. Audit RP reachability and redundancy during topology or multicast range changes.
  4. Filter and monitor MSDP source-active advertisements to limit unintended sources.

Explanation

Correct Answer

A:

Use separate source and RP path tests when documenting multicast failover. This control targets the underlying design risk. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The follow-up acceptance check remains: Control-plane state and packet captures match the expected shared or source-specific tree at each stage.

Incorrect Answers

B:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The repeat risk here is different: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. A directly relevant preventive control is: Use separate source and RP path tests when documenting multicast failover.

C:

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: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. A directly relevant preventive control is: Use separate source and RP path tests when documenting multicast failover.

D:

MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency. The repeat risk here is different: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. A directly relevant preventive control is: Use separate source and RP path tests when documenting multicast failover.

Question 761

A design team must resolve this enterprise network problem: During a predeployment review for a logistics control network, the team discovers this design gap: an engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Check and correct multicast reverse-path-forwarding reachability toward the source.
  2. Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.
  3. Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.
  4. Use authenticated encrypted collection paths and a segmented management architecture instead of unrestricted Internet exposure.

Explanation

Correct Answer

C:

Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow. This action addresses the stated design problem. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. A practical confirmation is: Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result.

Incorrect Answers

A:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The actual fault is governed by a different mechanism: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The needed response is: Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.

B:

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: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The needed response is: Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.

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: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The needed response is: Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.

Question 762

The design record describes this issue: During a predeployment review for a logistics control network, the team discovers this design gap: an engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.
  2. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.
  3. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  4. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender.

Explanation

Correct Answer

D:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The correct engineering response is: Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow. The observable check is: Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result.

Incorrect Answers

A:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The offered choice instead concerns a different principle: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. Those technical conditions are not interchangeable.

B:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The offered choice instead concerns a different principle: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. Those technical conditions are not interchangeable.

C:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular 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.

Question 763

After designing a change for the following scenario: During a predeployment review for a logistics control network, the team discovers this design gap: an engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result.
  2. Receivers join through the intended RP and source-to-group forwarding establishes after source activation.
  3. The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.
  4. During loss of the primary services site, required DNS, monitoring and administration remain available.

Explanation

Correct Answer

A:

Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender.

Incorrect Answers

B:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. In the case being tested, Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The necessary acceptance evidence is: Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result.

C:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. In the case being tested, Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The necessary acceptance evidence is: Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result.

D:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. In the case being tested, Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The necessary acceptance evidence is: Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result.

Question 764

A preventive architecture review covers this situation: During a predeployment review for a logistics control network, the team discovers this design gap: an engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. 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. Include source-path routing changes in multicast outage and maintenance drills.
  2. Use separate source and RP path tests when documenting multicast failover. Apply the same control to the logistics control network rollout checklist.
  3. Audit RP reachability and redundancy during topology or multicast range changes.
  4. Instrument congestion counters and test representative burst profiles before acceptance.

Explanation

Correct Answer

B:

Use separate source and RP path tests when documenting multicast failover. Apply the same control to the logistics control network rollout checklist. This control targets the underlying design risk. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The follow-up acceptance check remains: Control-plane state and packet captures match the expected shared or source-specific tree at each stage. The logistics control network acceptance record also captures this result.

Incorrect Answers

A:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The repeat risk here is different: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. A directly relevant preventive control is: Use separate source and RP path tests when documenting multicast failover. Apply the same control to the logistics control network rollout checklist.

C:

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: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. A directly relevant preventive control is: Use separate source and RP path tests when documenting multicast failover. Apply the same control to the logistics control network rollout checklist.

D:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The repeat risk here is different: Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. A directly relevant preventive control is: Use separate source and RP path tests when documenting multicast failover. Apply the same control to the logistics control network rollout checklist.

Question 765

A new campus or WAN review presents this constraint: An enterprise carries one known authorized video source per group and wants to avoid RP-related source discovery overhead. 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. Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.
  4. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

Explanation

Correct Answer

D:

Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing. This action addresses the stated design problem. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. A practical confirmation is: Receivers join only the expected (source,group) stream and unwanted sources do not appear.

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: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The needed response is: Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

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: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The needed response is: Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

C:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The actual fault is governed by a different mechanism: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The needed response is: Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

Question 766

For this Cisco ENSLD design case: An enterprise carries one known authorized video source per group and wants to avoid RP-related source discovery overhead. 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. MSDP can advertise active sources between participating RPs in ASM deployments; it is not an SSM dependency.
  3. Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions.
  4. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.

Explanation

Correct Answer

A:

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.

Incorrect Answers

B:

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: Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. 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 767

During acceptance testing for this network design: An enterprise carries one known authorized video source per group and wants to avoid RP-related source discovery overhead. 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. Receivers join only the expected (source,group) stream and unwanted sources do not appear.
  3. Receiver membership state identifies the intended source and the multicast stream is delivered.
  4. Multiple approved senders reach receivers over the intended shared tree at planned scale.

Explanation

Correct Answer

B:

Receivers join only the expected (source,group) stream and unwanted sources do not appear. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.

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, 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.

C:

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.

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 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.

Question 768

Operations wants to avoid recurrence of this design flaw: An enterprise carries one known authorized video source per group and wants to avoid RP-related source discovery overhead. 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. 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

C:

Audit group ranges, IGMP version and device support before converting ASM services to SSM. 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.

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: 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.

B:

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.

D:

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.

Question 769

A Cisco enterprise designer reviews the following scenario: 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 action MOST DIRECTLY meets the stated design requirement?

  1. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.
  2. Enable compatible source-specific host signaling or redesign the group strategy rather than expecting IGMPv2 to signal source selection.
  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

A:

Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing. This action addresses the stated design problem. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. A practical confirmation 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

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. The actual fault is governed by a different mechanism: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The needed response is: Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

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: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The needed response is: Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

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: SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The needed response is: Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.

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.