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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 83

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.

Question 821

During a network design workshop, the team finds this issue: An automation client sends configuration for a YANG leaf removed in a newer device software release. Which action MOST DIRECTLY meets the stated design requirement?

  1. Evaluate applicable OpenConfig YANG models and confirm each vendor’s implemented deviations.
  2. Discover and validate implemented model revisions and capabilities before composing the payload.
  3. Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.
  4. Add application or tunnel encryption whenever policy requires confidentiality across the private connection.

Explanation

Correct Answer

B:

Discover and validate implemented model revisions and capabilities before composing the payload. This action addresses the stated design problem. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. A practical confirmation is: Schema validation passes against the target version and the intended configuration is accepted.

Incorrect Answers

A:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The actual fault is governed by a different mechanism: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The needed response is: Discover and validate implemented model revisions and capabilities before composing the payload.

C:

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: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The needed response is: Discover and validate implemented model revisions and capabilities before composing the payload.

D:

A private connectivity circuit provides path separation but is not automatically end-to-end encryption. The actual fault is governed by a different mechanism: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The needed response is: Discover and validate implemented model revisions and capabilities before composing the payload.

Question 822

In a technical design review: An automation client sends configuration for a YANG leaf removed in a newer device software release. Which technical principle BEST explains the design decision?

  1. OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation.
  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. NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings.

Explanation

Correct Answer

C:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The correct engineering response is: Discover and validate implemented model revisions and capabilities before composing the payload. The observable check is: Schema validation passes against the target version and the intended configuration is accepted.

Incorrect Answers

A:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. 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.

B:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. 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.

D:

A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. 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 823

An engineering reviewer needs objective proof for the following: An automation client sends configuration for a YANG leaf removed in a newer device software release. Which acceptance observation BEST establishes the intended result?

  1. The module namespace and revision identify the applicable standards-based schema correctly.
  2. The same intended configuration fields are available on both vendor models without relying on hidden proprietary leaves.
  3. Users access the supported application without the enterprise managing its underlying server OS.
  4. Schema validation passes against the target version and the intended configuration is accepted.

Explanation

Correct Answer

D:

Schema validation passes against the target version and the intended configuration is accepted. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged.

Incorrect Answers

A:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. In the case being tested, a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The necessary acceptance evidence is: Schema validation passes against the target version and the intended configuration is accepted.

B:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. In the case being tested, a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The necessary acceptance evidence is: Schema validation passes against the target version and the intended configuration is accepted.

C:

SaaS normally delivers provider-managed finished applications to consumers instead of raw infrastructure building blocks. In the case being tested, a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The necessary acceptance evidence is: Schema validation passes against the target version and the intended configuration is accepted.

Question 824

The change advisory board sees a repeat risk in this case: An automation client sends configuration for a YANG leaf removed in a newer device software release. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Pin tested model versions and rerun schema compatibility checks during upgrades.
  2. Maintain a per-platform model-capability matrix before generating shared templates.
  3. Store module names, namespaces and revisions alongside each automation dependency.
  4. Separate confidentiality requirements from private-connectivity procurement checklists.

Explanation

Correct Answer

A:

Pin tested model versions and rerun schema compatibility checks during upgrades. This control targets the underlying design risk. A YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. The follow-up acceptance check remains: Schema validation passes against the target version and the intended configuration is accepted.

Incorrect Answers

B:

OpenConfig publishes vendor-neutral network models, while support and deviations vary by device implementation. The repeat risk here is different: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. A directly relevant preventive control is: Pin tested model versions and rerun schema compatibility checks during upgrades.

C:

IETF YANG models standardize common semantics independently of a vendor’s native extension models. The repeat risk here is different: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. A directly relevant preventive control is: Pin tested model versions and rerun schema compatibility checks during upgrades.

D:

A private connectivity circuit provides path separation but is not automatically end-to-end encryption. The repeat risk here is different: a YANG schema revision or deviation can change accepted paths and constraints even when the device family is unchanged. A directly relevant preventive control is: Pin tested model versions and rerun schema compatibility checks during upgrades.

Question 825

A design team must resolve this enterprise network problem: An automation workflow must stage several related configuration edits and commit them as one controlled transaction. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible.
  2. Create least-privilege API identities with read-only rights and protected credentials.
  3. Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow.
  4. Use RESTCONF with the appropriate resource path, authentication and HTTP method.

Explanation

Correct Answer

C:

Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow. This action addresses the stated design problem. NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. A practical confirmation is: A staged change commits atomically where supported and a failed validation leaves running configuration unchanged.

Incorrect Answers

A:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The actual fault is governed by a different mechanism: NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The needed response is: Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow.

B:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The actual fault is governed by a different mechanism: NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The needed response is: Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow.

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: NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The needed response is: Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow.

Question 826

The design record describes this issue: An automation workflow must stage several related configuration edits and commit them as one controlled transaction. Which technical principle BEST explains the design decision?

  1. NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings.
  2. RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session.
  3. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged.
  4. NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls.

Explanation

Correct Answer

D:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The correct engineering response is: Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow. The observable check is: A staged change commits atomically where supported and a failed validation leaves running configuration unchanged.

Incorrect Answers

A:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. 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.

B:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. 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.

C:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. 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 827

After designing a change for the following scenario: An automation workflow must stage several related configuration edits and commit them as one controlled transaction. Which acceptance observation BEST establishes the intended result?

  1. A staged change commits atomically where supported and a failed validation leaves running configuration unchanged.
  2. Read operations succeed while unauthorized configuration attempts are denied and audited.
  3. Each client connects to the correct endpoint and can read the same expected modeled state.
  4. A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.

Explanation

Correct Answer

A:

A staged change commits atomically where supported and a failed validation leaves running configuration unchanged. NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls.

Incorrect Answers

B:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. In the case being tested, NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The necessary acceptance evidence is: A staged change commits atomically where supported and a failed validation leaves running configuration unchanged.

C:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. In the case being tested, NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The necessary acceptance evidence is: A staged change commits atomically where supported and a failed validation leaves running configuration unchanged.

D:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. In the case being tested, NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The necessary acceptance evidence is: A staged change commits atomically where supported and a failed validation leaves running configuration unchanged.

Question 828

A preventive architecture review covers this situation: An automation workflow must stage several related configuration edits and commit them as one controlled transaction. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Validate endpoint protocol and supported capabilities in integration tests.
  2. Use locks, validation and rollback plans for transactional configuration changes.
  3. Rotate API secrets and review service account privileges regularly.
  4. Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.

Explanation

Correct Answer

B:

Use locks, validation and rollback plans for transactional configuration changes. This control targets the underlying design risk. NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The follow-up acceptance check remains: A staged change commits atomically where supported and a failed validation leaves running configuration unchanged.

Incorrect Answers

A:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The repeat risk here is different: NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. A directly relevant preventive control is: Use locks, validation and rollback plans for transactional configuration changes.

C:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The repeat risk here is different: NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. A directly relevant preventive control is: Use locks, validation and rollback plans for transactional configuration changes.

D:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The repeat risk here is different: NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. A directly relevant preventive control is: Use locks, validation and rollback plans for transactional configuration changes.

Question 829

A new campus or WAN review presents this constraint: A lightweight client needs to query a single resource over HTTPS using standard web methods and YANG-modeled data. Which action MOST DIRECTLY meets the stated design requirement?

  1. Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible.
  2. Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow.
  3. Evaluate provider WAN-to-cloud integration with deliberate routing, segmentation and capacity controls.
  4. Use RESTCONF with the appropriate resource path, authentication and HTTP method.

Explanation

Correct Answer

D:

Use RESTCONF with the appropriate resource path, authentication and HTTP method. This action addresses the stated design problem. RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. A practical confirmation is: A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.

Incorrect Answers

A:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The actual fault is governed by a different mechanism: RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The needed response is: Use RESTCONF with the appropriate resource path, authentication and HTTP method.

B:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The actual fault is governed by a different mechanism: RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The needed response is: Use RESTCONF with the appropriate resource path, authentication and HTTP method.

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: RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The needed response is: Use RESTCONF with the appropriate resource path, authentication and HTTP method.

Question 830

For this Cisco ENSLD design case: A lightweight client needs to query a single resource over HTTPS using standard web methods and YANG-modeled data. Which technical principle BEST explains the design decision?

  1. RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session.
  2. NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls.
  3. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged.
  4. Streaming telemetry can reduce repetitive per-device polling overhead and provide structured timely updates.

Explanation

Correct Answer

A:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The correct engineering response is: Use RESTCONF with the appropriate resource path, authentication and HTTP method. The observable check is: A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.

Incorrect Answers

B:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The offered choice instead concerns a different principle: NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. Those technical conditions are not interchangeable.

C:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. 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.

D:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. 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.