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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 86

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.

Question 851

The infrastructure team must validate this situation: A historical capacity model requires consistent five-minute time series even when link counters do not change much. Which acceptance observation BEST establishes the intended result?

  1. Only trusted collectors can establish sessions and packet captures show encrypted application data.
  2. Collector load and data freshness meet targets at a representative device count.
  3. Each tracked interface provides samples at the configured cadence without large gaps.
  4. The module namespace and revision identify the applicable standards-based schema correctly.

Explanation

Correct Answer

C:

Each tracked interface provides samples at the configured cadence without large gaps. Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes.

Incorrect Answers

A:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. In the case being tested, Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The necessary acceptance evidence is: Each tracked interface provides samples at the configured cadence without large gaps.

B:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. In the case being tested, Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The necessary acceptance evidence is: Each tracked interface provides samples at the configured cadence without large gaps.

D:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. In the case being tested, Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The necessary acceptance evidence is: Each tracked interface provides samples at the configured cadence without large gaps.

Question 852

A post-incident design review discusses the following: A historical capacity model requires consistent five-minute time series even when link counters do not change much. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Confirm the actual platform’s support for on-change updates and define missed-event recovery.
  2. Enforce mutual identity checks and secure collector access throughout the lifecycle.
  3. Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.
  4. Monitor collector timestamp drift and sample loss across site outages.

Explanation

Correct Answer

D:

Monitor collector timestamp drift and sample loss across site outages. This control targets the underlying design risk. Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The follow-up acceptance check remains: Each tracked interface provides samples at the configured cadence without large gaps.

Incorrect Answers

A:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The repeat risk here is different: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. A directly relevant preventive control is: Monitor collector timestamp drift and sample loss across site outages.

B:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The repeat risk here is different: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. A directly relevant preventive control is: Monitor collector timestamp drift and sample loss across site outages.

C:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The repeat risk here is different: Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. A directly relevant preventive control is: Monitor collector timestamp drift and sample loss across site outages.

Question 853

During a network design workshop, the team finds this issue: Telemetry data is sent unencrypted over a shared WAN and includes sensitive routing and interface metadata. 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 a suitable Platform-as-a-Service environment aligned with the application stack.

Explanation

Correct Answer

B:

Require encrypted and authenticated telemetry transport across the management domain. This action addresses the stated design problem. Operational telemetry can expose topology and capacity information if collection transport is left unsecured. A practical confirmation is: Only trusted collectors can establish sessions and packet captures show encrypted application data.

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: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The needed response is: Require encrypted and authenticated telemetry transport across the management domain.

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: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The needed response is: Require encrypted and authenticated telemetry transport across the management domain.

D:

PaaS supplies managed application runtime and platform capabilities while customers typically manage their code and data. The actual fault is governed by a different mechanism: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The needed response is: Require encrypted and authenticated telemetry transport across the management domain.

Question 854

In a technical design review: Telemetry data is sent unencrypted over a shared WAN and includes sensitive routing and interface metadata. Which technical principle BEST explains the design decision?

  1. Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes.
  2. Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates.
  3. Operational telemetry can expose topology and capacity information if collection transport is left unsecured.
  4. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged.

Explanation

Correct Answer

C:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The correct engineering response is: Require encrypted and authenticated telemetry transport across the management domain. The observable check is: Only trusted collectors can establish sessions and packet captures show encrypted application data.

Incorrect Answers

A:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. 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.

B:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. 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:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The offered choice instead concerns a different principle: Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. Those technical conditions are not interchangeable.

Question 855

An engineering reviewer needs objective proof for the following: Telemetry data is sent unencrypted over a shared WAN and includes sensitive routing and interface metadata. Which acceptance observation BEST establishes the intended result?

  1. Each tracked interface provides samples at the configured cadence without large gaps.
  2. A controlled interface-state change produces a prompt telemetry update at the collector.
  3. The module namespace and revision identify the applicable standards-based schema correctly.
  4. Only trusted collectors can establish sessions and packet captures show encrypted application data.

Explanation

Correct Answer

D:

Only trusted collectors can establish sessions and packet captures show encrypted application data. Operational telemetry can expose topology and capacity information if collection transport is left unsecured.

Incorrect Answers

A:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. In the case being tested, Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The necessary acceptance evidence is: Only trusted collectors can establish sessions and packet captures show encrypted application data.

B:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. In the case being tested, Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The necessary acceptance evidence is: Only trusted collectors can establish sessions and packet captures show encrypted application data.

C:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. In the case being tested, Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The necessary acceptance evidence is: Only trusted collectors can establish sessions and packet captures show encrypted application data.

Question 856

The change advisory board sees a repeat risk in this case: Telemetry data is sent unencrypted over a shared WAN and includes sensitive routing and interface metadata. 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. Rotate API secrets and review service account privileges regularly.

Explanation

Correct Answer

A:

Enforce mutual identity checks and secure collector access throughout the lifecycle. This control targets the underlying design risk. Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The follow-up acceptance check remains: Only trusted collectors can establish sessions and packet captures show encrypted application data.

Incorrect Answers

B:

Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates. The repeat risk here is different: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. A directly relevant preventive control is: Enforce mutual identity checks and secure collector access throughout the lifecycle.

C:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. The repeat risk here is different: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. A directly relevant preventive control is: Enforce mutual identity checks and secure collector access throughout the lifecycle.

D:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The repeat risk here is different: Operational telemetry can expose topology and capacity information if collection transport is left unsecured. A directly relevant preventive control is: Enforce mutual identity checks and secure collector access throughout the lifecycle.

Question 857

A design team must resolve this enterprise network problem: An architect labels gRPC and gNMI as identical protocols, making the telemetry integration diagram ambiguous. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use a supported gNMI Get operation for a point-in-time read.
  2. Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions.
  3. Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it.
  4. Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible.

Explanation

Correct Answer

C:

Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it. This action addresses the stated design problem. gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. A practical confirmation is: An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel.

Incorrect Answers

A:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The actual fault is governed by a different mechanism: gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The needed response is: Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it.

B:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The actual fault is governed by a different mechanism: gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The needed response is: Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it.

D:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The actual fault is governed by a different mechanism: gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The needed response is: Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it.

Question 858

The design record describes this issue: An architect labels gRPC and gNMI as identical protocols, making the telemetry integration diagram ambiguous. Which technical principle BEST explains the design decision?

  1. gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations.
  2. gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior.
  3. RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session.
  4. gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport.

Explanation

Correct Answer

D:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The correct engineering response is: Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it. The observable check is: An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel.

Incorrect Answers

A:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. 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.

B:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The offered choice instead concerns a different principle: gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. Those technical conditions are not interchangeable.

C:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The offered choice instead concerns a different principle: RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. Those technical conditions are not interchangeable.

Question 859

After designing a change for the following scenario: An architect labels gRPC and gNMI as identical protocols, making the telemetry integration diagram ambiguous. Which acceptance observation BEST establishes the intended result?

  1. An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel.
  2. The returned paths contain current interface values without requiring an ongoing subscription.
  3. The collector receives timely path updates and correctly handles reconnects and subscription status.
  4. Only trusted collectors can establish sessions and packet captures show encrypted application data.

Explanation

Correct Answer

A:

An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel. gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The result matters because it demonstrates the expected network behavior rather than only configuration presence.

Incorrect Answers

B:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. In the case being tested, gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The necessary acceptance evidence is: An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel.

C:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. In the case being tested, gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The necessary acceptance evidence is: An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel.

D:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. In the case being tested, gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The necessary acceptance evidence is: An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel.

Question 860

A preventive architecture review covers this situation: An architect labels gRPC and gNMI as identical protocols, making the telemetry integration diagram ambiguous. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Use consistent path and encoding expectations across inventory collectors.
  2. Document both API semantics and transport prerequisites in management interface specifications.
  3. Test stream limits, restart behavior and model-path compatibility before scale-out.
  4. Monitor collector timestamp drift and sample loss across site outages.

Explanation

Correct Answer

B:

Document both API semantics and transport prerequisites in management interface specifications. This control targets the underlying design risk. gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The follow-up acceptance check remains: An authenticated gNMI Capabilities or Get request succeeds over an established gRPC channel.

Incorrect Answers

A:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The repeat risk here is different: gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. A directly relevant preventive control is: Document both API semantics and transport prerequisites in management interface specifications.

C:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The repeat risk here is different: gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. A directly relevant preventive control is: Document both API semantics and transport prerequisites in management interface specifications.

D:

Periodic publication delivers time-indexed samples for rate and trend calculations independently of event changes. The repeat risk here is different: gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. A directly relevant preventive control is: Document both API semantics and transport prerequisites in management interface specifications.