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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 75

Question 740

A post-incident design review discusses the following: During a predeployment review for a hospital regional backbone, the team discovers this design gap: network operations want to collect telemetry from every site but will expose the collector publicly to simplify deployment. 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 OOB power and link diversity rather than assuming independence from the primary WAN.
  2. Review management ACLs, AAA and break-glass access in each security audit.
  3. Test shared-service failure domains in the disaster-recovery architecture.
  4. Maintain collector certificates, ACL inventories and retention rules in the management standard. Apply the same control to the hospital regional backbone rollout checklist.

Explanation

Correct Answer

D:

Maintain collector certificates, ACL inventories and retention rules in the management standard. Apply the same control to the hospital regional backbone rollout checklist. This control targets the underlying design risk. Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. The follow-up acceptance check remains: Only authorized sites and administrators can establish collector sessions and logs show approved sources. The hospital regional backbone acceptance record also captures this result.

Incorrect Answers

A:

OOB management can remain accessible when an in-band production network or routing plane fails. The repeat risk here is different: Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. A directly relevant preventive control is: Maintain collector certificates, ACL inventories and retention rules in the management standard. Apply the same control to the hospital regional backbone rollout checklist.

B:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. The repeat risk here is different: Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. A directly relevant preventive control is: Maintain collector certificates, ACL inventories and retention rules in the management standard. Apply the same control to the hospital regional backbone rollout checklist.

C:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The repeat risk here is different: Telemetry collectors can carry sensitive operational data and should be protected by management and access boundaries. A directly relevant preventive control is: Maintain collector certificates, ACL inventories and retention rules in the management standard. Apply the same control to the hospital regional backbone rollout checklist.

Question 741

During a network design workshop, the team finds this issue: A multicast receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. Which action MOST DIRECTLY meets the stated design requirement?

  1. Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.
  2. Check and correct multicast reverse-path-forwarding reachability toward the source.
  3. Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.
  4. Provide available or redundant network-service endpoints reachable from the disaster-recovery failure domain.

Explanation

Correct Answer

B:

Check and correct multicast reverse-path-forwarding reachability toward the source. This action addresses the stated design problem. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A practical confirmation is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.

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: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The needed response is: Check and correct multicast reverse-path-forwarding reachability toward the source.

C:

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: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The needed response is: Check and correct multicast reverse-path-forwarding reachability toward the source.

D:

Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. The actual fault is governed by a different mechanism: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The needed response is: Check and correct multicast reverse-path-forwarding reachability toward the source.

Question 742

In a technical design review: A multicast receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. 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. SSM identifies a desired source and group and generally does not rely on ASM RP source discovery.

Explanation

Correct Answer

C:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The correct engineering response is: Check and correct multicast reverse-path-forwarding reachability toward the source. The observable check is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.

Incorrect Answers

A:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. 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.

B:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. 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.

D:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. 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.

Question 743

An engineering reviewer needs objective proof for the following: A multicast receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. Which acceptance observation BEST establishes the intended result?

  1. Receivers join through the intended RP and source-to-group forwarding establishes after source activation.
  2. Control-plane state and packet captures match the expected shared or source-specific tree at each stage.
  3. SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.
  4. The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.

Explanation

Correct Answer

D:

The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.

Incorrect Answers

A:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. In the case being tested, Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The necessary acceptance evidence is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.

B:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. In the case being tested, Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The necessary acceptance evidence is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.

C:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. In the case being tested, Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The necessary acceptance evidence is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.

Question 744

The change advisory board sees a repeat risk in this case: A multicast receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. 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. Audit RP reachability and redundancy during topology or multicast range changes.
  4. Reassess policer burst settings whenever the access circuit size changes.

Explanation

Correct Answer

A:

Include source-path routing changes in multicast outage and maintenance drills. This control targets the underlying design risk. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The follow-up acceptance check remains: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets.

Incorrect Answers

B:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. The repeat risk here is different: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A directly relevant preventive control is: Include source-path routing changes in multicast outage and maintenance drills.

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: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A directly relevant preventive control is: Include source-path routing changes in multicast outage and maintenance drills.

D:

Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. The repeat risk here is different: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A directly relevant preventive control is: Include source-path routing changes in multicast outage and maintenance drills.

Question 745

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 receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. 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. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

Explanation

Correct Answer

C:

Check and correct multicast reverse-path-forwarding reachability toward the source. This action addresses the stated design problem. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A practical confirmation is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. The university core network 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 actual fault is governed by a different mechanism: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The needed response is: Check and correct multicast reverse-path-forwarding reachability toward the source.

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: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The needed response is: Check and correct multicast reverse-path-forwarding reachability toward the source.

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The actual fault is governed by a different mechanism: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The needed response is: Check and correct multicast reverse-path-forwarding reachability toward the source.

Question 746

The design record describes this issue: During a predeployment review for a university core network, the team discovers this design gap: a multicast receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. 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. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs.
  3. Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network.
  4. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.

Explanation

Correct Answer

D:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The correct engineering response is: Check and correct multicast reverse-path-forwarding reachability toward the source. The observable check is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. The university core 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 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.

B:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The offered choice instead concerns a different principle: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. Those technical conditions are not interchangeable.

C:

Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The offered choice instead concerns a different principle: Shared management and infrastructure services become dependencies that can undermine an otherwise redundant routed network. Those technical conditions are not interchangeable.

Question 747

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 receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. 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. The university core network acceptance record also captures this result.
  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.
  4. Multiple approved senders reach receivers over the intended shared tree at planned scale.

Explanation

Correct Answer

A:

The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. The university core network acceptance record also captures this result. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.

Incorrect Answers

B:

Shared trees organize joins around a rendezvous point while source trees follow paths toward a particular sender. In the case being tested, Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The necessary acceptance evidence is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. The university core network acceptance record also captures this result.

C:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. In the case being tested, Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The necessary acceptance evidence is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. The university core network acceptance record also captures this result.

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, Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The necessary acceptance evidence is: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. The university core network acceptance record also captures this result.

Question 748

A preventive architecture review covers this situation: During a predeployment review for a university core network, the team discovers this design gap: a multicast receiver receives nothing even though its group membership is present, and upstream unicast routes point away from the incoming source interface. 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. Use separate source and RP path tests when documenting multicast failover.
  2. Include source-path routing changes in multicast outage and maintenance drills. Apply the same control to the university core network rollout checklist.
  3. Audit RP reachability and redundancy during topology or multicast range changes.
  4. Test designated-forwarder election and RP failure behavior in the bidirectional domain.

Explanation

Correct Answer

B:

Include source-path routing changes in multicast outage and maintenance drills. Apply the same control to the university core network rollout checklist. This control targets the underlying design risk. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. The follow-up acceptance check remains: The incoming interface matches the expected RPF interface and subscribed receivers receive source packets. The university core 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 repeat risk here is different: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A directly relevant preventive control is: Include source-path routing changes in multicast outage and maintenance drills. Apply the same control to the university core 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: Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A directly relevant preventive control is: Include source-path routing changes in multicast outage and maintenance drills. Apply the same control to the university core network rollout checklist.

D:

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 RPF checks rely on the unicast or multicast routing view of the source path to avoid loops. A directly relevant preventive control is: Include source-path routing changes in multicast outage and maintenance drills. Apply the same control to the university core network rollout checklist.

Question 749

A new campus or WAN review presents this constraint: A PIM sparse-mode domain lacks a rendezvous point strategy and receivers cannot find new source traffic. Which action MOST DIRECTLY meets the stated design requirement?

  1. Check and correct multicast reverse-path-forwarding reachability toward the source.
  2. Distinguish shared-tree (*,G) behavior from source-specific (S,G) tree construction when planning RPF and traffic flow.
  3. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.
  4. Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.

Explanation

Correct Answer

D:

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.

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: 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.

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:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. 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 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.