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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 82

Question 810

The design record describes this issue: A multivendor automation team wants a vendor-neutral interface schema for common BGP and interface configuration. Which technical principle BEST explains the design decision?

  1. IETF YANG models standardize common semantics independently of a vendor’s native extension models.
  2. Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema.
  3. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged.
  4. OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation.

Explanation

Correct Answer

D:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The correct engineering response is: Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations. The observable check is: The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.

Incorrect Answers

A:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The offered choice instead concerns a different principle: IETF YANG models standardize common semantics independently of a vendor’s native extension models. Those technical conditions are not interchangeable.

B:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The offered choice instead concerns a different principle: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. Those technical conditions are not interchangeable.

C:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. 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 811

After designing a change for the following scenario: A multivendor automation team wants a vendor-neutral interface schema for common BGP and interface configuration. Which acceptance observation BEST establishes the intended result?

  1. The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.
  2. The intended platform-specific feature appears correctly in returned operational and configuration data.
  3. Schema validation passes against the target version and the intended configuration is accepted.
  4. The module namespace and revision identify the applicable standards-based schema correctly.

Explanation

Correct Answer

A:

The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves. OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation.

Incorrect Answers

B:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. In the case being tested, OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The necessary acceptance evidence is: The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.

C:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. In the case being tested, OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The necessary acceptance evidence is: The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.

D:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. In the case being tested, OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The necessary acceptance evidence is: The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.

Question 812

A preventive architecture review covers this situation: A multivendor automation team wants a vendor-neutral interface schema for common BGP and interface configuration. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Store module names, namespaces and revisions alongside each automation dependency.
  2. Maintain a per-platform model-capability matrix before generating shared templates.
  3. Separate vendor-specific adapters from reusable domain-level automation logic.
  4. Pin tested model versions and rerun schema compatibility checks during upgrades.

Explanation

Correct Answer

B:

Maintain a per-platform model-capability matrix before generating shared templates. This control targets the underlying design risk. OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The follow-up acceptance check remains: The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.

Incorrect Answers

A:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. The repeat risk here is different: OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. A directly relevant preventive control is: Maintain a per-platform model-capability matrix before generating shared templates.

C:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The repeat risk here is different: OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. A directly relevant preventive control is: Maintain a per-platform model-capability matrix before generating shared templates.

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: OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. A directly relevant preventive control is: Maintain a per-platform model-capability matrix before generating shared templates.

Question 813

A new campus or WAN review presents this constraint: An enterprise needs to automate a feature not defined in its current OpenConfig model set but available on its Cisco devices. Which action MOST DIRECTLY meets the stated design requirement?

  1. Discover and validate implemented model revisions and capabilities before composing the payload.
  2. Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations.
  3. Require encrypted and authenticated telemetry transport across the management domain.
  4. Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.

Explanation

Correct Answer

D:

Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping. This action addresses the stated design problem. Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. A practical confirmation is: The intended platform-specific feature appears correctly in returned operational and configuration data.

Incorrect Answers

A:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The actual fault is governed by a different mechanism: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The needed response is: Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.

B:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The actual fault is governed by a different mechanism: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The needed response is: Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.

C:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. The actual fault is governed by a different mechanism: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The needed response is: Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.

Question 814

For this Cisco ENSLD design case: An enterprise needs to automate a feature not defined in its current OpenConfig model set but available on its Cisco devices. Which technical principle BEST explains the design decision?

  1. Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema.
  2. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged.
  3. OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation.
  4. SaaS normally delivers provider-managed finished applications to consumers instead of raw infrastructure building blocks.

Explanation

Correct Answer

A:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The correct engineering response is: Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping. The observable check is: The intended platform-specific feature appears correctly in returned operational and configuration data.

Incorrect Answers

B:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. 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.

C:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The offered choice instead concerns a different principle: OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. Those technical conditions are not interchangeable.

D:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The offered choice instead concerns a different principle: SaaS normally delivers provider-managed finished applications to consumers instead of raw infrastructure building blocks. Those technical conditions are not interchangeable.

Question 815

During acceptance testing for this network design: An enterprise needs to automate a feature not defined in its current OpenConfig model set but available on its Cisco devices. Which acceptance observation BEST establishes the intended result?

  1. The module namespace and revision identify the applicable standards-based schema correctly.
  2. The intended platform-specific feature appears correctly in returned operational and configuration data.
  3. The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.
  4. Users access the supported application without the enterprise managing its underlying server OS.

Explanation

Correct Answer

B:

The intended platform-specific feature appears correctly in returned operational and configuration data. Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema.

Incorrect Answers

A:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. In the case being tested, Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The necessary acceptance evidence is: The intended platform-specific feature appears correctly in returned operational and configuration data.

C:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. In the case being tested, Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The necessary acceptance evidence is: The intended platform-specific feature appears correctly in returned operational and configuration data.

D:

SaaS normally delivers provider-managed finished applications to consumers instead of raw infrastructure building blocks. In the case being tested, Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The necessary acceptance evidence is: The intended platform-specific feature appears correctly in returned operational and configuration data.

Question 816

Operations wants to avoid recurrence of this design flaw: An enterprise needs to automate a feature not defined in its current OpenConfig model set but available on its Cisco devices. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Store module names, namespaces and revisions alongside each automation dependency.
  2. Pin tested model versions and rerun schema compatibility checks during upgrades.
  3. Separate vendor-specific adapters from reusable domain-level automation logic.
  4. Validate endpoint protocol and supported capabilities in integration tests.

Explanation

Correct Answer

C:

Separate vendor-specific adapters from reusable domain-level automation logic. This control targets the underlying design risk. Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The follow-up acceptance check remains: The intended platform-specific feature appears correctly in returned operational and configuration data.

Incorrect Answers

A:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. The repeat risk here is different: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. A directly relevant preventive control is: Separate vendor-specific adapters from reusable domain-level automation logic.

B:

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: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. A directly relevant preventive control is: Separate vendor-specific adapters from reusable domain-level automation logic.

D:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The repeat risk here is different: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. A directly relevant preventive control is: Separate vendor-specific adapters from reusable domain-level automation logic.

Question 817

A Cisco enterprise designer reviews the following scenario: A network engineer assumes all IETF YANG models are Cisco proprietary because a Cisco device exposes them. Which action MOST DIRECTLY meets the stated design requirement?

  1. Distinguish standards-track IETF models from vendor-native models by their published module identity and ownership.
  2. Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.
  3. Discover and validate implemented model revisions and capabilities before composing the payload.
  4. Use on-change publication where the modeled data path and device implementation support it.

Explanation

Correct Answer

A:

Distinguish standards-track IETF models from vendor-native models by their published module identity and ownership. This action addresses the stated design problem. IETF YANG models standardize common semantics independently of a vendor’s native extension models. A practical confirmation is: The module namespace and revision identify the applicable standards-based schema correctly.

Incorrect Answers

B:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The actual fault is governed by a different mechanism: IETF YANG models standardize common semantics independently of a vendor’s native extension models. The needed response is: Distinguish standards-track IETF models from vendor-native models by their published module identity and ownership.

C:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The actual fault is governed by a different mechanism: IETF YANG models standardize common semantics independently of a vendor’s native extension models. The needed response is: Distinguish standards-track IETF models from vendor-native models by their published module identity and ownership.

D:

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: IETF YANG models standardize common semantics independently of a vendor’s native extension models. The needed response is: Distinguish standards-track IETF models from vendor-native models by their published module identity and ownership.

Question 818

The network architecture board discusses the following: A network engineer assumes all IETF YANG models are Cisco proprietary because a Cisco device exposes them. Which technical principle BEST explains the design decision?

  1. Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema.
  2. IETF YANG models standardize common semantics independently of a vendor’s native extension models.
  3. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged.
  4. Hybrid cloud connects distinct private and public operating environments while retaining different control and residency responsibilities.

Explanation

Correct Answer

B:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. The correct engineering response is: Distinguish standards-track IETF models from vendor-native models by their published module identity and ownership. The observable check is: The module namespace and revision identify the applicable standards-based schema correctly.

Incorrect Answers

A:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. The offered choice instead concerns a different principle: Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. Those technical conditions are not interchangeable.

C:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. 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.

D:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. The offered choice instead concerns a different principle: Hybrid cloud connects distinct private and public operating environments while retaining different control and residency responsibilities. Those technical conditions are not interchangeable.

Question 819

The infrastructure team must validate this situation: A network engineer assumes all IETF YANG models are Cisco proprietary because a Cisco device exposes them. Which acceptance observation BEST establishes the intended result?

  1. The intended platform-specific feature appears correctly in returned operational and configuration data.
  2. The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.
  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

C:

The module namespace and revision identify the applicable standards-based schema correctly. IETF YANG models standardize common semantics independently of a vendor’s native extension models.

Incorrect Answers

A:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. In the case being tested, IETF YANG models standardize common semantics independently of a vendor’s native extension models. The necessary acceptance evidence is: The module namespace and revision identify the applicable standards-based schema correctly.

B:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. In the case being tested, IETF YANG models standardize common semantics independently of a vendor’s native extension models. The necessary acceptance evidence is: The module namespace and revision identify the applicable standards-based schema correctly.

D:

Operational telemetry can expose topology and capacity information if collection transport is left unsecured. In the case being tested, IETF YANG models standardize common semantics independently of a vendor’s native extension models. The necessary acceptance evidence is: The module namespace and revision identify the applicable standards-based schema correctly.

Question 820

A post-incident design review discusses the following: A network engineer assumes all IETF YANG models are Cisco proprietary because a Cisco device exposes them. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Separate vendor-specific adapters from reusable domain-level automation logic.
  2. Maintain a per-platform model-capability matrix before generating shared templates.
  3. Monitor service destinations, split-tunnel permissions and cloud on-ramp SLAs.
  4. Store module names, namespaces and revisions alongside each automation dependency.

Explanation

Correct Answer

D:

Store module names, namespaces and revisions alongside each automation dependency. This control targets the underlying design risk. IETF YANG models standardize common semantics independently of a vendor’s native extension models. The follow-up acceptance check remains: The module namespace and revision identify the applicable standards-based schema correctly.

Incorrect Answers

A:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. The repeat risk here is different: IETF YANG models standardize common semantics independently of a vendor’s native extension models. A directly relevant preventive control is: Store module names, namespaces and revisions alongside each automation dependency.

B:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The repeat risk here is different: IETF YANG models standardize common semantics independently of a vendor’s native extension models. A directly relevant preventive control is: Store module names, namespaces and revisions alongside each automation dependency.

C:

Cloud on-ramp designs can reduce unnecessary backhaul but must preserve security inspection and policy controls. The repeat risk here is different: IETF YANG models standardize common semantics independently of a vendor’s native extension models. A directly relevant preventive control is: Store module names, namespaces and revisions alongside each automation dependency.