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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 64

Question 630

In a technical design review: A voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. Which technical principle BEST explains the design decision?

  1. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs.
  2. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.
  3. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state.
  4. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.

Explanation

Correct Answer

C:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The correct engineering response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations. The observable check is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

Incorrect Answers

A:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. 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.

B:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. 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.

D:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. 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.

Question 631

An engineering reviewer needs objective proof for the following: A voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. Which acceptance observation BEST establishes the intended result?

  1. A test reservation is admitted only within available capacity and denied when the configured limit is reached.
  2. SSH, telemetry and route-monitoring traffic remain usable during sustained bulk transfers.
  3. Receivers join through the intended RP and source-to-group forwarding establishes after source activation.
  4. Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

Explanation

Correct Answer

D:

Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state.

Incorrect Answers

A:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. In the case being tested, DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The necessary acceptance evidence is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

B:

Critical management flows can be protected from starvation by a coherent end-to-end QoS policy. In the case being tested, DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The necessary acceptance evidence is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

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, DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The necessary acceptance evidence is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

Question 632

The change advisory board sees a repeat risk in this case: A voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Document a network-wide class model and verify markings at every trust boundary.
  2. Restrict per-flow reservation domains and monitor admission state at capacity boundaries.
  3. Audit RP reachability and redundancy during topology or multicast range changes.
  4. Document service class allocations and retest after link-rate changes.

Explanation

Correct Answer

A:

Document a network-wide class model and verify markings at every trust boundary. This control targets the underlying design risk. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The follow-up acceptance check remains: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.

Incorrect Answers

B:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The repeat risk here is different: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A directly relevant preventive control is: Document a network-wide class model and verify markings at every trust boundary.

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: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A directly relevant preventive control is: Document a network-wide class model and verify markings at every trust boundary.

D:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The repeat risk here is different: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A directly relevant preventive control is: Document a network-wide class model and verify markings at every trust boundary.

Question 633

A design team must resolve this enterprise network problem: During a predeployment review for a financial trading campus, the team discovers this design gap: a voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. An approval gate requires both a measurable acceptance check and a durable prevention control. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it.
  2. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.
  3. Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.
  4. Design a reachable and appropriately redundant RP mechanism for applicable ASM groups.

Explanation

Correct Answer

C:

Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations. This action addresses the stated design problem. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A practical confirmation is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus acceptance record also captures this result.

Incorrect Answers

A:

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: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The needed response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.

B:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The actual fault is governed by a different mechanism: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The needed response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.

D:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The actual fault is governed by a different mechanism: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The needed response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.

Question 634

The design record describes this issue: During a predeployment review for a financial trading campus, the team discovers this design gap: a voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs.
  2. Bidirectional PIM supports shared-tree forwarding for many-to-many multicast without constructing individual source trees for every sender.
  3. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.
  4. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state.

Explanation

Correct Answer

D:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The correct engineering response is: Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations. The observable check is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus acceptance record also captures this result.

Incorrect Answers

A:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. 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.

B:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. 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:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The offered choice instead concerns a different principle: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. Those technical conditions are not interchangeable.

Question 635

After designing a change for the following scenario: During a predeployment review for a financial trading campus, the team discovers this design gap: a voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. An approval gate requires both a measurable acceptance check and a durable prevention control. Which acceptance observation BEST establishes the intended result?

  1. Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus acceptance record also captures this result.
  2. A test reservation is admitted only within available capacity and denied when the configured limit is reached.
  3. Receivers join through the intended RP and source-to-group forwarding establishes after source activation.
  4. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Explanation

Correct Answer

A:

Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus acceptance record also captures this result. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state.

Incorrect Answers

B:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. In the case being tested, DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The necessary acceptance evidence is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus 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, DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The necessary acceptance evidence is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus acceptance record also captures this result.

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. In the case being tested, DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The necessary acceptance evidence is: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus acceptance record also captures this result.

Question 636

A preventive architecture review covers this situation: During a predeployment review for a financial trading campus, the team discovers this design gap: a voice rollout must scale across hundreds of flows without reserving per-flow resources on every router. 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. Restrict per-flow reservation domains and monitor admission state at capacity boundaries.
  2. Document a network-wide class model and verify markings at every trust boundary. Apply the same control to the financial trading campus rollout checklist.
  3. Align shaping rates with provider CIR and include encapsulation overhead during capacity planning.
  4. Reassess policer burst settings whenever the access circuit size changes.

Explanation

Correct Answer

B:

Document a network-wide class model and verify markings at every trust boundary. Apply the same control to the financial trading campus rollout checklist. This control targets the underlying design risk. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The follow-up acceptance check remains: Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA. The financial trading campus acceptance record also captures this result.

Incorrect Answers

A:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The repeat risk here is different: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A directly relevant preventive control is: Document a network-wide class model and verify markings at every trust boundary. Apply the same control to the financial trading campus rollout checklist.

C:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. The repeat risk here is different: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A directly relevant preventive control is: Document a network-wide class model and verify markings at every trust boundary. Apply the same control to the financial trading campus rollout checklist.

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: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. A directly relevant preventive control is: Document a network-wide class model and verify markings at every trust boundary. Apply the same control to the financial trading campus rollout checklist.

Question 637

A new campus or WAN review presents this constraint: An industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. Which action MOST DIRECTLY meets the stated design requirement?

  1. Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.
  2. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.
  3. Use Source-Specific Multicast with compatible receiver signaling such as IGMPv3 and supported routing.
  4. Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it.

Explanation

Correct Answer

D:

Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it. This action addresses the stated design problem. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. A practical confirmation is: A test reservation is admitted only within available capacity and denied when the configured limit is reached.

Incorrect Answers

A:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The actual fault is governed by a different mechanism: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The needed response is: Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it.

B:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The actual fault is governed by a different mechanism: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The needed response is: Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it.

C:

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: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The needed response is: Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it.

Question 638

For this Cisco ENSLD design case: An industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. Which technical principle BEST explains the design decision?

  1. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs.
  2. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state.
  3. PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery.
  4. Multicast RPF checks rely on the unicast or multicast routing view of the source path to avoid loops.

Explanation

Correct Answer

A:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The correct engineering response is: Evaluate IntServ/RSVP-style resource reservation only where every participating device can support it. The observable check is: A test reservation is admitted only within available capacity and denied when the configured limit is reached.

Incorrect Answers

B:

Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The offered choice instead concerns a different principle: DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. Those technical conditions are not interchangeable.

C:

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

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

Question 639

During acceptance testing for this network design: An industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. Which acceptance observation BEST establishes the intended result?

  1. Voice marking persists appropriately and test congestion retains voice delay within the defined class SLA.
  2. A test reservation is admitted only within available capacity and denied when the configured limit is reached.
  3. During an induced production outage, an authorized operator reaches device console or management endpoints through OOB.
  4. Source egress traffic no longer scales linearly with receiver count and only joined receivers receive copies.

Explanation

Correct Answer

B:

A test reservation is admitted only within available capacity and denied when the configured limit is reached. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs.

Incorrect Answers

A:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. In the case being tested, Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The necessary acceptance evidence is: A test reservation is admitted only within available capacity and denied when the configured limit is reached.

C:

OOB management can remain accessible when an in-band production network or routing plane fails. In the case being tested, Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The necessary acceptance evidence is: A test reservation is admitted only within available capacity and denied when the configured limit is reached.

D:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. In the case being tested, Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The necessary acceptance evidence is: A test reservation is admitted only within available capacity and denied when the configured limit is reached.

Question 640

Operations wants to avoid recurrence of this design flaw: An industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Document a network-wide class model and verify markings at every trust boundary.
  2. Use provider class mapping tables and test end-to-end during new circuit acceptance.
  3. Restrict per-flow reservation domains and monitor admission state at capacity boundaries.
  4. Audit RP reachability and redundancy during topology or multicast range changes.

Explanation

Correct Answer

C:

Restrict per-flow reservation domains and monitor admission state at capacity boundaries. This control targets the underlying design risk. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. The follow-up acceptance check remains: A test reservation is admitted only within available capacity and denied when the configured limit is reached.

Incorrect Answers

A:

DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state. The repeat risk here is different: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. A directly relevant preventive control is: Restrict per-flow reservation domains and monitor admission state at capacity boundaries.

B:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. A directly relevant preventive control is: Restrict per-flow reservation domains and monitor admission state at capacity boundaries.

D:

PIM sparse-mode any-source multicast may use an RP to help establish shared-tree membership and source discovery. The repeat risk here is different: Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs. A directly relevant preventive control is: Restrict per-flow reservation domains and monitor admission state at capacity boundaries.