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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 84

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.

Question 831

During acceptance testing for this network design: A lightweight client needs to query a single resource over HTTPS using standard web methods and YANG-modeled data. Which acceptance observation BEST establishes the intended result?

  1. Read operations succeed while unauthorized configuration attempts are denied and audited.
  2. A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.
  3. Each client connects to the correct endpoint and can read the same expected modeled state.
  4. The intended platform-specific feature appears correctly in returned operational and configuration data.

Explanation

Correct Answer

B:

A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields. RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session.

Incorrect Answers

A:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. In the case being tested, RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The necessary acceptance evidence is: A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.

C:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. In the case being tested, RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The necessary acceptance evidence is: A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.

D:

Native models expose device-specific data that may not map exactly to a standards-based OpenConfig schema. In the case being tested, RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The necessary acceptance evidence is: A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.

Question 832

Operations wants to avoid recurrence of this design flaw: A lightweight client needs to query a single resource over HTTPS using standard web methods and YANG-modeled data. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Validate endpoint protocol and supported capabilities in integration tests.
  2. Rotate API secrets and review service account privileges regularly.
  3. Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.
  4. Track guest patching, access controls and backup ownership for each IaaS workload.

Explanation

Correct Answer

C:

Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials. This control targets the underlying design risk. RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The follow-up acceptance check remains: 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 repeat risk here is different: RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. A directly relevant preventive control is: Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.

B:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The repeat risk here is different: RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. A directly relevant preventive control is: Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.

D:

IaaS provides compute, storage and network building blocks while the customer typically manages the guest OS and workloads. The repeat risk here is different: RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. A directly relevant preventive control is: Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.

Question 833

A Cisco enterprise designer reviews the following scenario: A script sends a NETCONF edit-config RPC to a RESTCONF endpoint and receives an unsupported-operation error. 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. Use RESTCONF with the appropriate resource path, authentication and HTTP method.
  3. Create least-privilege API identities with read-only rights and protected credentials.
  4. Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.

Explanation

Correct Answer

A:

Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible. This action addresses the stated design problem. NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. A practical confirmation is: Each client connects to the correct endpoint and can read the same expected modeled state.

Incorrect Answers

B:

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 and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The needed response is: Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible.

C:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The actual fault is governed by a different mechanism: NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The needed response is: Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible.

D:

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: NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The needed response is: Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible.

Question 834

The network architecture board discusses the following: A script sends a NETCONF edit-config RPC to a RESTCONF endpoint and receives an unsupported-operation error. Which technical principle BEST explains the design decision?

  1. NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls.
  2. NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings.
  3. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged.
  4. SaaS normally delivers provider-managed finished applications to consumers instead of raw infrastructure building blocks.

Explanation

Correct Answer

B:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The correct engineering response is: Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible. The observable check is: Each client connects to the correct endpoint and can read the same expected modeled state.

Incorrect Answers

A:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. 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:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. 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:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. 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 835

The infrastructure team must validate this situation: A script sends a NETCONF edit-config RPC to a RESTCONF endpoint and receives an unsupported-operation error. Which acceptance observation BEST establishes the intended result?

  1. Read operations succeed while unauthorized configuration attempts are denied and audited.
  2. A GET returns the expected modeled resource and an authorized PATCH changes only the intended fields.
  3. Each client connects to the correct endpoint and can read the same expected modeled state.
  4. The collector receives timely path updates and correctly handles reconnects and subscription status.

Explanation

Correct Answer

C:

Each client connects to the correct endpoint and can read the same expected modeled state. NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings.

Incorrect Answers

A:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. In the case being tested, NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The necessary acceptance evidence is: Each client connects to the correct endpoint and can read the same expected modeled state.

B:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. In the case being tested, NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The necessary acceptance evidence is: Each client connects to the correct endpoint and can read the same expected modeled state.

D:

gNMI Subscribe supports modeled telemetry streaming rather than repeated manual Get operations. In the case being tested, NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The necessary acceptance evidence is: Each client connects to the correct endpoint and can read the same expected modeled state.

Question 836

A post-incident design review discusses the following: A script sends a NETCONF edit-config RPC to a RESTCONF endpoint and receives an unsupported-operation error. Which preventive design control MOST DIRECTLY addresses this specific risk?

  1. Rotate API secrets and review service account privileges regularly.
  2. Use schema-aware HTTP clients and enforce TLS and least-privilege API credentials.
  3. Plan redundant circuits and validate provider handoff and BGP failover behavior.
  4. Validate endpoint protocol and supported capabilities in integration tests.

Explanation

Correct Answer

D:

Validate endpoint protocol and supported capabilities in integration tests. This control targets the underlying design risk. NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The follow-up acceptance check remains: Each client connects to the correct endpoint and can read the same expected modeled state.

Incorrect Answers

A:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The repeat risk here is different: NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. A directly relevant preventive control is: Validate endpoint protocol and supported capabilities in integration tests.

B:

RESTCONF presents model-defined data using HTTP-based resources, unlike NETCONF’s RPC-oriented protocol session. The repeat risk here is different: NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. A directly relevant preventive control is: Validate endpoint protocol and supported capabilities in integration tests.

C:

Dedicated cloud connectivity can provide a managed private network path, but still requires peering and physical redundancy design. The repeat risk here is different: NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. A directly relevant preventive control is: Validate endpoint protocol and supported capabilities in integration tests.

Question 837

During a network design workshop, the team finds this issue: A campus controller account uses full administrative privileges for a service that only reads interface statistics. Which action MOST DIRECTLY meets the stated design requirement?

  1. Prefer NETCONF where its datastores, locking and candidate/commit operations satisfy the workflow.
  2. Create least-privilege API identities with read-only rights and protected credentials.
  3. Use the protocol-specific transport and request syntax rather than treating the APIs as wire-compatible.
  4. Use the appropriate Cisco-native YANG model where supported and isolate the vendor-specific mapping.

Explanation

Correct Answer

B:

Create least-privilege API identities with read-only rights and protected credentials. This action addresses the stated design problem. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. A practical confirmation is: Read operations succeed while unauthorized configuration attempts are denied and audited.

Incorrect Answers

A:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. The actual fault is governed by a different mechanism: Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The needed response is: Create least-privilege API identities with read-only rights and protected credentials.

C:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. The actual fault is governed by a different mechanism: Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The needed response is: Create least-privilege API identities with read-only rights and protected credentials.

D:

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: Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The needed response is: Create least-privilege API identities with read-only rights and protected credentials.

Question 838

In a technical design review: A campus controller account uses full administrative privileges for a service that only reads interface statistics. 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 and RESTCONF may access YANG-modeled data but use different transport and operation encodings.
  3. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged.
  4. PaaS supplies managed application runtime and platform capabilities while customers typically manage their code and data.

Explanation

Correct Answer

C:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The correct engineering response is: Create least-privilege API identities with read-only rights and protected credentials. The observable check is: Read operations succeed while unauthorized configuration attempts are denied and audited.

Incorrect Answers

A:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. 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.

B:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. 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.

D:

Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The offered choice instead concerns a different principle: PaaS supplies managed application runtime and platform capabilities while customers typically manage their code and data. Those technical conditions are not interchangeable.

Question 839

An engineering reviewer needs objective proof for the following: A campus controller account uses full administrative privileges for a service that only reads interface statistics. 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. Each client connects to the correct endpoint and can read the same expected modeled state.
  3. The application deploys through the platform and the provider manages underlying runtime host infrastructure.
  4. Read operations succeed while unauthorized configuration attempts are denied and audited.

Explanation

Correct Answer

D:

Read operations succeed while unauthorized configuration attempts are denied and audited. Model-driven management interfaces can modify sensitive configuration if clients are overprivileged.

Incorrect Answers

A:

NETCONF uses structured RPC operations and can support explicit configuration datastores and commit controls. In the case being tested, Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The necessary acceptance evidence is: Read operations succeed while unauthorized configuration attempts are denied and audited.

B:

NETCONF and RESTCONF may access YANG-modeled data but use different transport and operation encodings. In the case being tested, Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The necessary acceptance evidence is: Read operations succeed while unauthorized configuration attempts are denied and audited.

C:

PaaS supplies managed application runtime and platform capabilities while customers typically manage their code and data. In the case being tested, Model-driven management interfaces can modify sensitive configuration if clients are overprivileged. The necessary acceptance evidence is: Read operations succeed while unauthorized configuration attempts are denied and audited.

Question 840

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

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

Explanation

Correct Answer

A:

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

Incorrect Answers

B:

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

C:

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

D:

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