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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 65

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.

Question 641

A Cisco enterprise designer reviews the following scenario: During a predeployment review for a hospital regional backbone, the team discovers this design gap: an industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. 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. Choose a DiffServ-based class policy with consistent DSCP semantics instead of per-flow IntServ reservations.
  3. Check and correct multicast reverse-path-forwarding reachability toward the source.
  4. Design physically or logically separate out-of-band management access with independent reachability.

Explanation

Correct Answer

A:

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. The hospital regional backbone acceptance record also captures this result.

Incorrect Answers

B:

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.

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: 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.

D:

OOB management can remain accessible when an in-band production network or routing plane fails. 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 642

The network architecture board discusses the following: During a predeployment review for a hospital regional backbone, the team discovers this design gap: an industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. DiffServ uses aggregated traffic classes and per-hop behaviors, which scale more naturally than per-flow RSVP-style state.
  2. Integrated Services can request per-flow resource treatment but introduces signaling and state scalability trade-offs.
  3. SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism.
  4. Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic.

Explanation

Correct Answer

B:

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. The hospital regional backbone 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 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: SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. 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: Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. Those technical conditions are not interchangeable.

Question 643

The infrastructure team must validate this situation: During a predeployment review for a hospital regional backbone, the team discovers this design gap: an industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. 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.
  2. Receiver membership state identifies the intended source and the multicast stream is delivered.
  3. A test reservation is admitted only within available capacity and denied when the configured limit is reached. The hospital regional backbone acceptance record also captures this result.
  4. Only approved jump hosts can reach management interfaces and user VLANs cannot enter the management segment.

Explanation

Correct Answer

C:

A test reservation is admitted only within available capacity and denied when the configured limit is reached. The hospital regional backbone acceptance record also captures this result. 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. The hospital regional backbone acceptance record also captures this result.

B:

SSM receivers normally signal a particular source/group using IGMPv3 or an equivalent mechanism. 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. The hospital regional backbone acceptance record also captures this result.

D:

Management-plane segmentation reduces the attack surface and common-mode dependency on user traffic. 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. The hospital regional backbone acceptance record also captures this result.

Question 644

A post-incident design review discusses the following: During a predeployment review for a hospital regional backbone, the team discovers this design gap: an industrial control network requires explicit per-flow bandwidth commitments at a limited set of controlled links. 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. Document a network-wide class model and verify markings at every trust boundary.
  2. Use separate source and RP path tests when documenting multicast failover.
  3. Capacity-test multicast replication at distribution boundaries and avoid flooding uninterested segments.
  4. Restrict per-flow reservation domains and monitor admission state at capacity boundaries. Apply the same control to the hospital regional backbone rollout checklist.

Explanation

Correct Answer

D:

Restrict per-flow reservation domains and monitor admission state at capacity boundaries. Apply the same control to the hospital regional backbone rollout checklist. 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. The hospital regional backbone 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 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. Apply the same control to the hospital regional backbone 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: 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. Apply the same control to the hospital regional backbone rollout checklist.

C:

Multicast can replicate traffic within the network only where receivers need it, reducing redundant source-side transmissions. 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. Apply the same control to the hospital regional backbone rollout checklist.

Question 645

During a network design workshop, the team finds this issue: Employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. Which action MOST DIRECTLY meets the stated design requirement?

  1. Size buffers and apply shaping, scheduling and monitoring for peak bursts at the actual bottleneck link.
  2. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.
  3. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  4. Shape outbound traffic to a sustainable rate near the provider’s committed rate before the bottleneck.

Explanation

Correct Answer

B:

Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags. This action addresses the stated design problem. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A practical confirmation is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Incorrect Answers

A:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. The actual fault is governed by a different mechanism: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The needed response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

C:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The actual fault is governed by a different mechanism: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The needed response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

D:

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: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The needed response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

Question 646

In a technical design review: Employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. Which technical principle BEST explains the design decision?

  1. Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion.
  2. CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue.
  3. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.
  4. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.

Explanation

Correct Answer

C:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The correct engineering response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags. The observable check is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The offered choice instead concerns a different principle: Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. Those technical conditions are not interchangeable.

B:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. 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.

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. 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 647

An engineering reviewer needs objective proof for the following: Employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. Which acceptance observation BEST establishes the intended result?

  1. The intended markings or provider classes are visible on both sides of the WAN demarcation.
  2. Provider policer drops decrease and application throughput settles near the planned service rate.
  3. Peak-period loss, queue occupancy and jitter meet requirements after the policy change.
  4. Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Explanation

Correct Answer

D:

Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.

Incorrect Answers

A:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. In the case being tested, an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The necessary acceptance evidence is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

B:

Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess. In the case being tested, an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The necessary acceptance evidence is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

C:

Average bandwidth below circuit capacity does not prevent short congestion intervals from filling queues. In the case being tested, an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The necessary acceptance evidence is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Question 648

The change advisory board sees a repeat risk in this case: Employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Specify trusted and untrusted marking boundaries in the QoS design.
  2. Document service class allocations and retest after link-rate changes.
  3. Use provider class mapping tables and test end-to-end during new circuit acceptance.
  4. Tune early-drop thresholds from actual queue statistics rather than default assumptions.

Explanation

Correct Answer

A:

Specify trusted and untrusted marking boundaries in the QoS design. This control targets the underlying design risk. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The follow-up acceptance check remains: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points.

Incorrect Answers

B:

CBWFQ reserves proportional service opportunity for classes under congestion without assigning every flow an absolute priority queue. The repeat risk here is different: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A directly relevant preventive control is: Specify trusted and untrusted marking boundaries in the QoS design.

C:

End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. The repeat risk here is different: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A directly relevant preventive control is: Specify trusted and untrusted marking boundaries in the QoS design.

D:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The repeat risk here is different: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A directly relevant preventive control is: Specify trusted and untrusted marking boundaries in the QoS design.

Question 649

A design team must resolve this enterprise network problem: During a predeployment review for a university core network, the team discovers this design gap: employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. 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 class-based weighted fair queuing with planned per-class bandwidth allocations.
  2. Consider supported early-drop queue management such as WRED for an appropriate nonpriority class.
  3. Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.
  4. Provide a bounded low-latency priority queue for verified voice traffic.

Explanation

Correct Answer

C:

Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags. This action addresses the stated design problem. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. A practical confirmation is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. The university core network acceptance record also captures this result.

Incorrect Answers

A:

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: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The needed response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

B:

Weighted random early detection can drop selected packets before total queue exhaustion to help reduce synchronized TCP congestion. The actual fault is governed by a different mechanism: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The needed response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

D:

A priority queue reduces latency for a tightly controlled real-time class but must be bounded to avoid starving others. The actual fault is governed by a different mechanism: an untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The needed response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags.

Question 650

The design record describes this issue: During a predeployment review for a university core network, the team discovers this design gap: employee laptops set all application packets to the highest DSCP value, overwhelming priority queues. An approval gate requires both a measurable acceptance check and a durable prevention control. Which technical principle BEST explains the design decision?

  1. Traffic shaping buffers and schedules excess packets to smooth bursts instead of immediately discarding all excess.
  2. End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain.
  3. Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue.
  4. An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them.

Explanation

Correct Answer

D:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The correct engineering response is: Classify and remark traffic at a trusted access or distribution boundary rather than trusting all endpoint tags. The observable check is: Traffic captures show unauthorized high-priority markings rewritten before reaching congestion points. The university core network acceptance record also captures this result.

Incorrect Answers

A:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. 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.

B:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The offered choice instead concerns a different principle: End-to-end QoS behavior depends on consistent class mapping across each administrative transport domain. Those technical conditions are not interchangeable.

C:

An untrusted endpoint can mark arbitrary DSCP values unless network policy validates and normalizes them. The offered choice instead concerns a different principle: Policing measures traffic against a rate profile and can drop or remark excess traffic rather than delaying it in a shaping queue. Those technical conditions are not interchangeable.