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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 76

Question 750

For this Cisco ENSLD design case: A PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. Which technical principle BEST explains the design decision?

  1. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.
  2. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender.
  3. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.
  4. OOB management can remain accessible when an in-band production network or routing plane fails.

Explanation

Correct Answer

A:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The correct engineering response is: Design a reachable and appropriately redundant RP mechanism for applicable ASM groups. The observable check is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation.

Incorrect Answers

B:

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

C:

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

D:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The offered choice instead concerns a different principle: OOB management can remain accessible when an in-band production network or routing plane fails. Those technical conditions are not interchangeable.

Question 751

During acceptance testing for this network design: A PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. Which acceptance observation BEST establishes the intended result?

  1. The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.
  2. Receivers join through the intended RP and source-to-group forwarding establishes after source activation.
  3. Control-plane state and packet captures match the expected shared or source-specific tree at each stage.
  4. Multiple approved senders reach receivers over the intended shared tree at planned scale.

Explanation

Correct Answer

B:

Receivers join through the intended RP and source-to-group forwarding establishes after source activation. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.

Incorrect Answers

A:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. In the case being tested, PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The necessary acceptance evidence is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation.

C:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. In the case being tested, PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The necessary acceptance evidence is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation.

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, PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The necessary acceptance evidence is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation.

Question 752

Operations wants to avoid recurrence of this design flaw: A PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. 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. Audit group ranges, IGMP version and device support before converting ASM services to SSM.

Explanation

Correct Answer

C:

Audit RP reachability and redundancy during topology or multicast range changes. This control targets the underlying design risk. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The follow-up acceptance check remains: Receivers join through the intended RP and source-to-group forwarding establishes after source activation.

Incorrect Answers

A:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The repeat risk here is different: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. A directly relevant preventive control is: Audit RP reachability and redundancy during topology or multicast range changes.

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: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. A directly relevant preventive control is: Audit RP reachability and redundancy during topology or multicast range changes.

D:

SSM identifies a desired source and group and generally does not rely on ASM RP source discovery. The repeat risk here is different: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. A directly relevant preventive control is: Audit RP reachability and redundancy during topology or multicast range changes.

Question 753

A Cisco enterprise designer reviews the following scenario: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.
  2. Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.
  3. Check and correct multicast reverse-path-forwarding reachability toward the source.
  4. Use class-based weighted fair queuing with planned per-class bandwidth allocations.

Explanation

Correct Answer

A:

Design a reachable and appropriately redundant RP mechanism for applicable ASM groups. This action addresses the stated design problem. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. A practical confirmation is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

B:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The actual fault is governed by a different mechanism: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The needed response is: Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.

C:

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: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The needed response is: Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.

D:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The actual fault is governed by a different mechanism: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The needed response is: Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.

Question 754

The network architecture board discusses the following: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender.
  2. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.
  3. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.
  4. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.

Explanation

Correct Answer

B:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The correct engineering response is: Design a reachable and appropriately redundant RP mechanism for applicable ASM groups. The observable check is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus acceptance record also captures this result.

Incorrect Answers

A:

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

C:

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

D:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The offered choice instead concerns a different principle: Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. Those technical conditions are not interchangeable.

Question 755

The infrastructure team must validate this situation: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.
  2. Control-plane state and packet captures match the expected shared or source-specific tree at each stage.
  3. Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus acceptance record also captures this result.
  4. Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

Explanation

Correct Answer

C:

Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus acceptance record also captures this result. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.

Incorrect Answers

A:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. In the case being tested, PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The necessary acceptance evidence is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus acceptance record also captures this result.

B:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. In the case being tested, PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The necessary acceptance evidence is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus acceptance record also captures this result.

D:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. In the case being tested, PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The necessary acceptance evidence is: Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus acceptance record also captures this result.

Question 756

A post-incident design review discusses the following: During a predeployment review for a high-volume retail campus, the team discovers this design gap: a PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. 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.
  3. Test OOB power and link diversity rather than assuming independence from the primary WAN.
  4. Audit RP reachability and redundancy during topology or multicast range changes. Apply the same control to the high-volume retail campus rollout checklist.

Explanation

Correct Answer

D:

Audit RP reachability and redundancy during topology or multicast range changes. Apply the same control to the high-volume retail campus rollout checklist. This control targets the underlying design risk. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The follow-up acceptance check remains: Receivers join through the intended RP and source-to-group forwarding establishes after source activation. The high-volume retail campus 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: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. A directly relevant preventive control is: Audit RP reachability and redundancy during topology or multicast range changes. Apply the same control to the high-volume retail campus rollout checklist.

B:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The repeat risk here is different: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. A directly relevant preventive control is: Audit RP reachability and redundancy during topology or multicast range changes. Apply the same control to the high-volume retail campus rollout checklist.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. The repeat risk here is different: PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. A directly relevant preventive control is: Audit RP reachability and redundancy during topology or multicast range changes. Apply the same control to the high-volume retail campus rollout checklist.

Question 757

During a network design workshop, the team finds this issue: An engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.
  2. Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.
  3. Check and correct multicast reverse-path-forwarding reachability toward the source.
  4. Evaluate MSDP peering between the appropriate RP domains where legacy ASM interdomain source discovery is required.

Explanation

Correct Answer

B:

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.

Incorrect Answers

A:

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.

C:

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.

D:

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: 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 758

In a technical design review: An engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. 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. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender.
  4. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.

Explanation

Correct Answer

C:

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.

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.

D:

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: CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. Those technical conditions are not interchangeable.

Question 759

An engineering reviewer needs objective proof for the following: An engineer assumes a multicast shared tree and shortest-path source tree are the same forwarding path. Which acceptance observation BEST establishes the intended result?

  1. The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.
  2. Receivers join through the intended RP and source-to-group forwarding establishes after source activation.
  3. The intended markings or provider classes are visible on both sides of the WAN demarcation.
  4. Control-plane state and packet captures match the expected shared or source-specific tree at each stage.

Explanation

Correct Answer

D:

Control-plane state and packet captures match the expected shared or source-specific tree at each stage. Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender.

Incorrect Answers

A:

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.

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.

C:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. 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.

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.