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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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Designing Cisco Enterprise Networks (ENSLD) (300-420) Practice Tests

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Cisco 300-420 Practice Test 85

Question 840

The change advisory board sees a repeat risk in this case: A campus controller account uses full administrative privileges for a service that only reads interface statistics. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Rotate API secrets and review service account privileges regularly.
  2. Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.
  3. Use locks, validation and rollback plans for transactional configuration changes.
  4. Track guest patching, access controls and backup ownership for each IaaS workload.

Explanation

Correct Answer

A:

Rotate API secrets and review service account privileges regularly. This control targets the underlying design risk. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The follow-up acceptance check remains: Read operations succeed while unauthorized configuration attempts are denied and audited.

Incorrect Answers

B:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The repeat risk here is different: Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. A directly relevant preventive control is: Rotate API secrets and review service account privileges regularly.

C:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The repeat risk here is different: Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. A directly relevant preventive control is: Rotate API secrets and review service account privileges regularly.

D:

IaaS provides compute, storage and network building blocks while the customer typically manages the guest OS and workloads. The repeat risk here is different: Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. A directly relevant preventive control is: Rotate API secrets and review service account privileges regularly.

Question 841

A design team must resolve this enterprise network problem: A network operations group polls thousands of interfaces every second and overloads collectors during an incident. Which action MOST DIRECTLY meets the stated design requirement?

  1. Choose periodic sampled telemetry with an interval aligned to the analytics use case.
  2. Use on-change publication where the modeled data path and device implementation support it.
  3. Use model-driven streaming telemetry with controlled subscriptions and an appropriate interval.
  4. Require encrypted and authenticated telemetry transport across the management domain.

Explanation

Correct Answer

C:

Use model-driven streaming telemetry with controlled subscriptions and an appropriate interval. This action addresses the stated design problem. Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. A practical confirmation is: Collector load and data freshness meet targets at a representative device count.

Incorrect Answers

A:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The actual fault is governed by a different mechanism: Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The needed response is: Use model-driven streaming telemetry with controlled subscriptions and an appropriate interval.

B:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The actual fault is governed by a different mechanism: Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The needed response is: Use model-driven streaming telemetry with controlled subscriptions and an appropriate interval.

D:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The actual fault is governed by a different mechanism: Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The needed response is: Use model-driven streaming telemetry with controlled subscriptions and an appropriate interval.

Question 842

The design record describes this issue: A network operations group polls thousands of interfaces every second and overloads collectors during an incident. Which technical principle BEST explains the design decision?

  1. On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling.
  2. Operational telemetry can expose topology and capacity information if collection transport is left unsecured.
  3. Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes.
  4. Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates.

Explanation

Correct Answer

D:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The correct engineering response is: Use model-driven streaming telemetry with controlled subscriptions and an appropriate interval. The observable check is: Collector load and data freshness meet targets at a representative device count.

Incorrect Answers

A:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The offered choice instead concerns a different principle: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. Those technical conditions are not interchangeable.

B:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The offered choice instead concerns a different principle: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. Those technical conditions are not interchangeable.

C:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The offered choice instead concerns a different principle: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. Those technical conditions are not interchangeable.

Question 843

After designing a change for the following scenario: A network operations group polls thousands of interfaces every second and overloads collectors during an incident. Which acceptance observation BEST establishes the intended result?

  1. Collector load and data freshness meet targets at a representative device count.
  2. Only trusted collectors can establish sessions and packet captures show encrypted application data.
  3. Each tracked interface provides samples at the configured cadence without large gaps.
  4. A controlled interface-state change produces a prompt telemetry update at the collector.

Explanation

Correct Answer

A:

Collector load and data freshness meet targets at a representative device count. Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates.

Incorrect Answers

B:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. In the case being tested, Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The necessary acceptance evidence is: Collector load and data freshness meet targets at a representative device count.

C:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. In the case being tested, Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The necessary acceptance evidence is: Collector load and data freshness meet targets at a representative device count.

D:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. In the case being tested, Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The necessary acceptance evidence is: Collector load and data freshness meet targets at a representative device count.

Question 844

A preventive architecture review covers this situation: A network operations group polls thousands of interfaces every second and overloads collectors during an incident. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Enforce mutual identity checks and secure collector access throughout the lifecycle.
  2. Capacity-plan subscriptions and apply backpressure or collection tiers for large deployments.
  3. Confirm the actual platform’s support for on-change updates and define missed-event recovery.
  4. Monitor collector timestamp drift and sample loss across site outages.

Explanation

Correct Answer

B:

Capacity-plan subscriptions and apply backpressure or collection tiers for large deployments. This control targets the underlying design risk. Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The follow-up acceptance check remains: Collector load and data freshness meet targets at a representative device count.

Incorrect Answers

A:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The repeat risk here is different: Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. A directly relevant preventive control is: Capacity-plan subscriptions and apply backpressure or collection tiers for large deployments.

C:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The repeat risk here is different: Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. A directly relevant preventive control is: Capacity-plan subscriptions and apply backpressure or collection tiers for large deployments.

D:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The repeat risk here is different: Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. A directly relevant preventive control is: Capacity-plan subscriptions and apply backpressure or collection tiers for large deployments.

Question 845

A new campus or WAN review presents this constraint: A change-management dashboard needs accurate change detection as device state changes, not only hourly snapshots. Which action MOST DIRECTLY meets the stated design requirement?

  1. Require encrypted and authenticated telemetry transport across the management domain.
  2. Choose periodic sampled telemetry with an interval aligned to the analytics use case.
  3. Use a supported gNMI Get operation for a point-in-time read.
  4. Use on-change publication where the modeled data path and device implementation support it.

Explanation

Correct Answer

D:

Use on-change publication where the modeled data path and device implementation support it. This action addresses the stated design problem. On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. A practical confirmation is: A controlled interface-state change produces a prompt telemetry update at the collector.

Incorrect Answers

A:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The actual fault is governed by a different mechanism: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The needed response is: Use on-change publication where the modeled data path and device implementation support it.

B:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The actual fault is governed by a different mechanism: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The needed response is: Use on-change publication where the modeled data path and device implementation support it.

C:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The actual fault is governed by a different mechanism: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The needed response is: Use on-change publication where the modeled data path and device implementation support it.

Question 846

For this Cisco ENSLD design case: A change-management dashboard needs accurate change detection as device state changes, not only hourly snapshots. Which technical principle BEST explains the design decision?

  1. On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling.
  2. Operational telemetry can expose topology and capacity information if collection transport is left unsecured.
  3. Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes.
  4. gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations.

Explanation

Correct Answer

A:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The correct engineering response is: Use on-change publication where the modeled data path and device implementation support it. The observable check is: A controlled interface-state change produces a prompt telemetry update at the collector.

Incorrect Answers

B:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The offered choice instead concerns a different principle: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. Those technical conditions are not interchangeable.

C:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The offered choice instead concerns a different principle: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. Those technical conditions are not interchangeable.

D:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The offered choice instead concerns a different principle: gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. Those technical conditions are not interchangeable.

Question 847

During acceptance testing for this network design: A change-management dashboard needs accurate change detection as device state changes, not only hourly snapshots. Which acceptance observation BEST establishes the intended result?

  1. Collector load and data freshness meet targets at a representative device count.
  2. A controlled interface-state change produces a prompt telemetry update at the collector.
  3. Each tracked interface provides samples at the configured cadence without large gaps.
  4. Users access the supported application without the enterprise managing its underlying server OS.

Explanation

Correct Answer

B:

A controlled interface-state change produces a prompt telemetry update at the collector. On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling.

Incorrect Answers

A:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. In the case being tested, On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The necessary acceptance evidence is: A controlled interface-state change produces a prompt telemetry update at the collector.

C:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. In the case being tested, On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The necessary acceptance evidence is: A controlled interface-state change produces a prompt telemetry update at the collector.

D:

SaaS normally delivers provider-managed finished applications to consumers instead of raw infrastructure building blocks. In the case being tested, On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The necessary acceptance evidence is: A controlled interface-state change produces a prompt telemetry update at the collector.

Question 848

Operations wants to avoid recurrence of this design flaw: A change-management dashboard needs accurate change detection as device state changes, not only hourly snapshots. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Monitor collector timestamp drift and sample loss across site outages.
  2. Capacity-plan subscriptions and apply backpressure or collection tiers for large deployments.
  3. Confirm the actual platform’s support for on-change updates and define missed-event recovery.
  4. Audit route leaks and cloud egress paths before onboarding new sites.

Explanation

Correct Answer

C:

Confirm the actual platform’s support for on-change updates and define missed-event recovery. This control targets the underlying design risk. On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The follow-up acceptance check remains: A controlled interface-state change produces a prompt telemetry update at the collector.

Incorrect Answers

A:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The repeat risk here is different: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. A directly relevant preventive control is: Confirm the actual platform’s support for on-change updates and define missed-event recovery.

B:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The repeat risk here is different: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. A directly relevant preventive control is: Confirm the actual platform’s support for on-change updates and define missed-event recovery.

D:

MPLS or provider WAN integration can extend private routed connectivity toward cloud attachments where the carrier supports it. The repeat risk here is different: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. A directly relevant preventive control is: Confirm the actual platform’s support for on-change updates and define missed-event recovery.

Question 849

A Cisco enterprise designer reviews the following scenario: A historical capacity model requires consistent five-minute time series even when link counters do not change much. Which action MOST DIRECTLY meets the stated design requirement?

  1. Choose periodic sampled telemetry with an interval aligned to the analytics use case.
  2. Require encrypted and authenticated telemetry transport across the management domain.
  3. Use on-change publication where the modeled data path and device implementation support it.
  4. Use RESTCONF with the appropriate resource path, authentication and HTTP method.

Explanation

Correct Answer

A:

Choose periodic sampled telemetry with an interval aligned to the analytics use case. This action addresses the stated design problem. Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. A practical confirmation is: Each tracked interface provides samples at the configured cadence without large gaps.

Incorrect Answers

B:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The actual fault is governed by a different mechanism: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The needed response is: Choose periodic sampled telemetry with an interval aligned to the analytics use case.

C:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The actual fault is governed by a different mechanism: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The needed response is: Choose periodic sampled telemetry with an interval aligned to the analytics use case.

D:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The actual fault is governed by a different mechanism: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The needed response is: Choose periodic sampled telemetry with an interval aligned to the analytics use case.

Question 850

The network architecture board discusses the following: A historical capacity model requires consistent five-minute time series even when link counters do not change much. Which technical principle BEST explains the design decision?

  1. On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling.
  2. Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes.
  3. Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates.
  4. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged.

Explanation

Correct Answer

B:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The correct engineering response is: Choose periodic sampled telemetry with an interval aligned to the analytics use case. The observable check is: Each tracked interface provides samples at the configured cadence without large gaps.

Incorrect Answers

A:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The offered choice instead concerns a different principle: On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. Those technical conditions are not interchangeable.

C:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The offered choice instead concerns a different principle: Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. Those technical conditions are not interchangeable.

D:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The offered choice instead concerns a different principle: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. Those technical conditions are not interchangeable.