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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 87

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.

Question 861

A new campus or WAN review presents this constraint: An inventory process needs to read modeled interface state once from a device rather than maintain a permanent stream. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions.
  2. Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it.
  3. Design explicit hybrid-cloud connectivity and data-governance boundaries between private and public environments.
  4. Use a supported gNMI Get operation for a point-in-time read.

Explanation

Correct Answer

D:

Use a supported gNMI Get operation for a point-in-time read. This action addresses the stated design problem. gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. A practical confirmation is: The returned paths contain current interface values without requiring an ongoing subscription.

Incorrect Answers

A:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The actual fault is governed by a different mechanism: gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The needed response is: Use a supported gNMI Get operation for a point-in-time read.

B:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The actual fault is governed by a different mechanism: gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The needed response is: Use a supported gNMI Get operation for a point-in-time read.

C:

Hybrid cloud connects distinct private and public operating environments while retaining different control and residency responsibilities. The actual fault is governed by a different mechanism: gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The needed response is: Use a supported gNMI Get operation for a point-in-time read.

Question 862

For this Cisco ENSLD design case: An inventory process needs to read modeled interface state once from a device rather than maintain a permanent stream. Which technical principle BEST explains the design decision?

  1. gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior.
  2. gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport.
  3. gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations.
  4. NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings.

Explanation

Correct Answer

A:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The correct engineering response is: Use a supported gNMI Get operation for a point-in-time read. The observable check is: The returned paths contain current interface values without requiring an ongoing subscription.

Incorrect Answers

B:

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

C:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. 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.

D:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The offered choice instead concerns a different principle: NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. Those technical conditions are not interchangeable.

Question 863

During acceptance testing for this network design: An inventory process needs to read modeled interface state once from a device rather than maintain a permanent stream. 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. Selected SaaS traffic uses the intended nearer cloud entry point with measured improved latency.

Explanation

Correct Answer

B:

The returned paths contain current interface values without requiring an ongoing subscription. gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The result matters because it demonstrates the expected network behavior rather than only configuration presence.

Incorrect Answers

A:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. In the case being tested, gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The necessary acceptance evidence is: The returned paths contain current interface values without requiring an ongoing subscription.

C:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. In the case being tested, gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The necessary acceptance evidence is: The returned paths contain current interface values without requiring an ongoing subscription.

D:

Cloud on-ramp designs can reduce unnecessary backhaul but must preserve security inspection and policy controls. In the case being tested, gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The necessary acceptance evidence is: The returned paths contain current interface values without requiring an ongoing subscription.

Question 864

Operations wants to avoid recurrence of this design flaw: An inventory process needs to read modeled interface state once from a device rather than maintain a permanent stream. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Test stream limits, restart behavior and model-path compatibility before scale-out.
  2. Document both API semantics and transport prerequisites in management interface specifications.
  3. Use consistent path and encoding expectations across inventory collectors.
  4. Pin tested model versions and rerun schema compatibility checks during upgrades.

Explanation

Correct Answer

C:

Use consistent path and encoding expectations across inventory collectors. This control targets the underlying design risk. gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The follow-up acceptance check remains: The returned paths contain current interface values without requiring an ongoing subscription.

Incorrect Answers

A:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The repeat risk here is different: gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. A directly relevant preventive control is: Use consistent path and encoding expectations across inventory collectors.

B:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The repeat risk here is different: gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. A directly relevant preventive control is: Use consistent path and encoding expectations across inventory collectors.

D:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The repeat risk here is different: gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. A directly relevant preventive control is: Use consistent path and encoding expectations across inventory collectors.

Question 865

A Cisco enterprise designer reviews the following scenario: A collector needs continuous operational updates about routing and interface state from supported devices. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions.
  2. Use a supported gNMI Get operation for a point-in-time read.
  3. Treat gRPC as the transport and RPC framework, and gNMI as a network management interface built on it.
  4. Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations.

Explanation

Correct Answer

A:

Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions. This action addresses the stated design problem. gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. A practical confirmation is: The collector receives timely path updates and correctly handles reconnects and subscription status.

Incorrect Answers

B:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The actual fault is governed by a different mechanism: gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The needed response is: Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions.

C:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The actual fault is governed by a different mechanism: gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The needed response is: Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions.

D:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The actual fault is governed by a different mechanism: gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The needed response is: Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions.

Question 866

The network architecture board discusses the following: A collector needs continuous operational updates about routing and interface state from supported devices. Which technical principle BEST explains the design decision?

  1. gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior.
  2. gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations.
  3. gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport.
  4. MPLS or provider WAN integration can extend private routed connectivity toward cloud attachments where the carrier supports it.

Explanation

Correct Answer

B:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The correct engineering response is: Use a gNMI Subscribe workflow with the appropriate stream mode and path subscriptions. The observable check is: The collector receives timely path updates and correctly handles reconnects and subscription status.

Incorrect Answers

A:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. 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 Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The offered choice instead concerns a different principle: gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. Those technical conditions are not interchangeable.

D:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The offered choice instead concerns a different principle: MPLS or provider WAN integration can extend private routed connectivity toward cloud attachments where the carrier supports it. Those technical conditions are not interchangeable.

Question 867

The infrastructure team must validate this situation: A collector needs continuous operational updates about routing and interface state from supported devices. 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. A controlled interface-state change produces a prompt telemetry update at the collector.

Explanation

Correct Answer

C:

The collector receives timely path updates and correctly handles reconnects and subscription status. gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The result matters because it demonstrates the expected network behavior rather than only configuration presence.

Incorrect Answers

A:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. In the case being tested, gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The necessary acceptance evidence is: The collector receives timely path updates and correctly handles reconnects and subscription status.

B:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. In the case being tested, gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The necessary acceptance evidence is: The collector receives timely path updates and correctly handles reconnects and subscription status.

D:

On-change telemetry publishes when eligible state values change, reducing delay compared with coarse periodic sampling. In the case being tested, gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The necessary acceptance evidence is: The collector receives timely path updates and correctly handles reconnects and subscription status.

Question 868

A post-incident design review discusses the following: A collector needs continuous operational updates about routing and interface state from supported devices. 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. Separate vendor-specific adapters from reusable domain-level automation logic.
  4. Test stream limits, restart behavior and model-path compatibility before scale-out.

Explanation

Correct Answer

D:

Test stream limits, restart behavior and model-path compatibility before scale-out. This control targets the underlying design risk. gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. The follow-up acceptance check remains: The collector receives timely path updates and correctly handles reconnects and subscription status.

Incorrect Answers

A:

gNMI Get retrieves selected modeled paths, while Subscribe handles streaming or subscription behavior. The repeat risk here is different: gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. A directly relevant preventive control is: Test stream limits, restart behavior and model-path compatibility before scale-out.

B:

gNMI defines network configuration and telemetry operations using gRPC as its underlying RPC transport. The repeat risk here is different: gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. A directly relevant preventive control is: Test stream limits, restart behavior and model-path compatibility before scale-out.

C:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The repeat risk here is different: gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. A directly relevant preventive control is: Test stream limits, restart behavior and model-path compatibility before scale-out.

Question 869

During a network design workshop, the team finds this issue: A critical data center needs predictable private cloud connectivity and wants to avoid relying solely on the public Internet. Which action MOST DIRECTLY meets the stated design requirement?

  1. Add application or tunnel encryption whenever policy requires confidentiality across the private connection.
  2. Evaluate an appropriate provider private direct connection with resilient physical access.
  3. Evaluate provider WAN-to-cloud integration with deliberate routing, segmentation and capacity controls.
  4. Evaluate a controlled cloud on-ramp or local Internet breakout for supported SaaS flows.

Explanation

Correct Answer

B:

Evaluate an appropriate provider private direct connection with resilient physical access. This action addresses the stated design problem. Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. A practical confirmation is: Cloud service prefixes route through the contracted private connection and remain reachable after one access failure.

Incorrect Answers

A:

A private connectivity circuit provides path separation but is not automatically end-to-end encryption. The actual fault is governed by a different mechanism: Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The needed response is: Evaluate an appropriate provider private direct connection with resilient physical access.

C:

MPLS or provider WAN integration can extend private routed connectivity toward cloud attachments where the carrier supports it. The actual fault is governed by a different mechanism: Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The needed response is: Evaluate an appropriate provider private direct connection with resilient physical access.

D:

Cloud on-ramp designs can reduce unnecessary backhaul but must preserve security inspection and policy controls. The actual fault is governed by a different mechanism: Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The needed response is: Evaluate an appropriate provider private direct connection with resilient physical access.

Question 870

In a technical design review: A critical data center needs predictable private cloud connectivity and wants to avoid relying solely on the public Internet. Which technical principle BEST explains the design decision?

  1. MPLS or provider WAN integration can extend private routed connectivity toward cloud attachments where the carrier supports it.
  2. A private connectivity circuit provides path separation but is not automatically end-to-end encryption.
  3. Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design.
  4. Cloud on-ramp designs can reduce unnecessary backhaul but must preserve security inspection and policy controls.

Explanation

Correct Answer

C:

Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The correct engineering response is: Evaluate an appropriate provider private direct connection with resilient physical access. The observable check is: Cloud service prefixes route through the contracted private connection and remain reachable after one access failure.

Incorrect Answers

A:

Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The offered choice instead concerns a different principle: MPLS or provider WAN integration can extend private routed connectivity toward cloud attachments where the carrier supports it. Those technical conditions are not interchangeable.

B:

Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The offered choice instead concerns a different principle: a private connectivity circuit provides path separation but is not automatically end-to-end encryption. Those technical conditions are not interchangeable.

D:

Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The offered choice instead concerns a different principle: Cloud on-ramp designs can reduce unnecessary backhaul but must preserve security inspection and policy controls. Those technical conditions are not interchangeable.