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Cisco 350-501 Practice Test 62

Question 610

For an original SPCOR service-provider engineering scenario, consider: A service provider controller sends NETCONF edit-config to a candidate datastore then declares the rollout complete without committing the candidate change. Select TWO complementary steps: the targeted correction and its strongest prechange validation.

  1. Mark any received NETCONF response as a successful committed change and ignore rpc-error content and datastore semantics.
  2. Check: Inspect capabilities, URL module prefix, requested HTTP method, Content-Type and returned status with a nonproduction test interface.
  3. Check: Compare NETCONF hello capabilities, target datastore, rpc-reply ok or rpc-error and device running configuration after a staged edit.
  4. Change: Execute NETCONF operations against the intended supported datastore and verify RPC outcomes, commit state and operational configuration.
  5. Change: Align exporter and collector template handling, source interface, sampling and timeout settings, then validate interpreted flow fields.

Explanation

Correct Answer

C:

NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change. Acceptance: Only valid transactions enter the intended configuration datastore and any commit failure is clearly reported and rolled back where supported.

D:

NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change. Evidence: Compare NETCONF hello capabilities, target datastore, rpc-reply ok or rpc-error and device running configuration after a staged edit.

Incorrect Answers

A:

For this select two assessment, the shortcut changes or bypasses the necessary routing, service or operational boundary rather than correcting it. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

B:

Check: Inspect capabilities, URL module prefix, requested HTTP method, Content-Type and returned status with a nonproduction test interface. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

E:

Change: Align exporter and collector template handling, source interface, sampling and timeout settings, then validate interpreted flow fields. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

Question 611

A service provider network engineer is reviewing this backbone or customer-service scenario: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success. A proposed shortcut is: Mark any received NETCONF response as a successful committed change and ignore rpc-error content and datastore semantics. What should the service provider engineer recommend as the narrowly scoped correction? Select ONE best answer.

  1. Execute NETCONF operations against the intended supported datastore and verify RPC outcomes, commit state and operational configuration.
  2. Use the platform's published YANG module and typed hierarchical schema to construct data operations with validated paths and leaf types.
  3. Represent service intent using supported Cisco NSO models and dry-run transactional changes and validate device diffs and recovery behavior.
  4. Mark any received NETCONF response as a successful committed change and ignore rpc-error content and datastore semantics.

Explanation

Correct Answer

A:

This targeted action addresses the observed service-provider control or forwarding gap without discarding necessary controls. Applied case: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success.

Incorrect Answers

B:

Use the platform's published YANG module and typed hierarchical schema to construct data operations with validated paths and leaf types. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

C:

Represent service intent using supported Cisco NSO models and dry-run transactional changes and validate device diffs and recovery behavior. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

D:

NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change. Applied case: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success.

Question 612

A Cisco service provider design review finds: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success. The team proposes: Execute NETCONF operations against the intended supported datastore and verify RPC outcomes, commit state and operational configuration. Which engineering principle most strongly supports the recommended response? Select ONE best answer.

  1. NetFlow and IPFIX export summarized flow records whose field templates and sampling rules determine what collectors can reconstruct.
  2. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.
  3. gRPC carries typed RPC streams, while gNMI supports model-based telemetry and configuration; TLS and mTLS protect and authenticate session peers.
  4. YANG defines containers lists keys and typed leaves, allowing supported protocol clients to validate configuration independently of arbitrary CLI text layouts.

Explanation

Correct Answer

B:

Demonstrable success requires: Only valid transactions enter the intended configuration datastore and any commit failure is clearly reported and rolled back where supported. Applied case: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success.

Incorrect Answers

A:

NetFlow and IPFIX export summarized flow records whose field templates and sampling rules determine what collectors can reconstruct. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

C:

GRPC carries typed RPC streams, while gNMI supports model-based telemetry and configuration; TLS and mTLS protect and authenticate session peers. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

D:

YANG defines containers lists keys and typed leaves, allowing supported protocol clients to validate configuration independently of arbitrary CLI text layouts. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

Question 613

The service provider operations team has not yet approved a change. Current evidence indicates: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success. Which evidence best tests the technical diagnosis before approving a disruptive change? Select ONE best answer.

  1. Compare exported templates, sequence counters, sampling rate, collector parsing and independently measured test-flow traffic.
  2. Inspect module revision, namespace, leaf types and schema paths and test one valid and one invalid payload in a lab.
  3. Compare NETCONF hello capabilities, target datastore, rpc-reply ok or rpc-error and device running configuration after a staged edit.
  4. Check state addresses, lock contention, plan create-update-destroy actions and expected controller changes in a sandbox.

Explanation

Correct Answer

C:

NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change. Confirm afterward that: Only valid transactions enter the intended configuration datastore and any commit failure is clearly reported and rolled back where supported.

Incorrect Answers

A:

Compare exported templates, sequence counters, sampling rate, collector parsing and independently measured test-flow traffic. An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success.

B:

Inspect module revision, namespace, leaf types and schema paths and test one valid and one invalid payload in a lab. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

D:

Check state addresses, lock contention, plan create-update-destroy actions and expected controller changes in a sandbox. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

Question 614

A candidate correction has been tested and the platform team requires a post-change acceptance check. Original problem: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success. The carrier operations owner needs positive and negative tests showing existing customer services remain available. Which acceptance result demonstrates correct service provider forwarding and control behavior without disrupting authorized workflows? Select ONE best answer.

  1. Only authorized PEs are targeted, repeated runs become stable and skipped or unreachable devices are explicitly reported.
  2. Read and write requests affect only approved modeled resources and invalid payloads receive specific diagnosable errors.
  3. Only valid transactions enter the intended configuration datastore and any commit failure is clearly reported and rolled back where supported.
  4. New devices enroll only with trusted artifacts and unique approved identities, and unexpected bootstrap sources are rejected.

Explanation

Correct Answer

C:

NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change. The approved implementation step was: Execute NETCONF operations against the intended supported datastore and verify RPC outcomes, commit state and operational configuration.

Incorrect Answers

A:

Only authorized PEs are targeted, repeated runs become stable and skipped or unreachable devices are explicitly reported. An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success.

B:

Read and write requests affect only approved modeled resources and invalid payloads receive specific diagnosable errors. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

D:

New devices enroll only with trusted artifacts and unique approved identities, and unexpected bootstrap sources are rejected. NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change.

Question 615

An implementation sign-off request identifies the following problem: An automation script receives an XML rpc-error after a NETCONF request but treats the established SSH session as proof of configuration success. Which paired technical change and validation should close the implementation review? Select ONE best answer.

  1. Change: Select supported RESTCONF data paths and HTTP operations, preserve YANG schema types and handle documented status and error bodies. Verify: Inspect capabilities, URL module prefix, requested HTTP method, Content-Type and returned status with a nonproduction test interface.
  2. Change: Execute NETCONF operations against the intended supported datastore and verify RPC outcomes, commit state and operational configuration. Verify: Compare NETCONF hello capabilities, target datastore, rpc-reply ok or rpc-error and device running configuration after a staged edit.
  3. Change: Configure mutually authenticated TLS and supported gNMI dial-in or dial-out subscription behavior with certificate trust and stable sensor paths. Verify: Verify service certificates, trust chains, SAN validation, gNMI subscription paths and telemetry timestamps over a controlled authorized and unauthorized test.
  4. Change: Use the platform's published YANG module and typed hierarchical schema to construct data operations with validated paths and leaf types. Verify: Inspect module revision, namespace, leaf types and schema paths and test one valid and one invalid payload in a lab.

Explanation

Correct Answer

B:

NETCONF uses modeled XML RPC messages and datastore operations; an active SSH transport or accepted candidate does not necessarily mean a committed change. The change is successful only when: Only valid transactions enter the intended configuration datastore and any commit failure is clearly reported and rolled back where supported.

Incorrect Answers

A:

Change: Select supported RESTCONF data paths and HTTP operations, preserve YANG schema types and handle documented status and error bodies.

C:

Change: Configure mutually authenticated TLS and supported gNMI dial-in or dial-out subscription behavior with certificate trust and stable sensor paths.

D:

Change: Use the platform's published YANG module and typed hierarchical schema to construct data operations with validated paths and leaf types.

Question 616

A service provider network engineer is reviewing this backbone or customer-service scenario: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes. A proposed shortcut is: Post arbitrary plaintext IOS CLI to every RESTCONF endpoint and assume a 200 response is guaranteed. What should the service provider engineer recommend as the narrowly scoped correction? Select ONE best answer.

  1. Normalize model identifiers, timestamps and collector health across gNMI, flow and management telemetry before declaring a backbone service incident.
  2. Keep state in an access-controlled locked backend and review plans and drift against provider-supported network resources before apply.
  3. Select supported RESTCONF data paths and HTTP operations, preserve YANG schema types and handle documented status and error bodies.
  4. Post arbitrary plaintext IOS CLI to every RESTCONF endpoint and assume a 200 response is guaranteed.

Explanation

Correct Answer

C:

This targeted action addresses the observed service-provider control or forwarding gap without discarding necessary controls. Applied case: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes.

Incorrect Answers

A:

Normalize model identifiers, timestamps and collector health across gNMI, flow and management telemetry before declaring a backbone service incident. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

B:

Keep state in an access-controlled locked backend and review plans and drift against provider-supported network resources before apply. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

D:

RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation. For this best change assessment, the shortcut changes or bypasses the necessary routing, service or operational boundary rather than correcting it.

Question 617

A Cisco service provider design review finds: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes. The team proposes: Select supported RESTCONF data paths and HTTP operations, preserve YANG schema types and handle documented status and error bodies. Which engineering principle most strongly supports the recommended response? Select ONE best answer.

  1. NetFlow and IPFIX export summarized flow records whose field templates and sampling rules determine what collectors can reconstruct.
  2. gRPC carries typed RPC streams, while gNMI supports model-based telemetry and configuration; TLS and mTLS protect and authenticate session peers.
  3. Secure ZTP reduces manual first-boot work while requiring device identity, image integrity and confidentiality for configuration and enrollment secrets.
  4. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

Explanation

Correct Answer

D:

Demonstrable success requires: Read and write requests affect only approved modeled resources and invalid payloads receive specific diagnosable errors. Applied case: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes.

Incorrect Answers

A:

NetFlow and IPFIX export summarized flow records whose field templates and sampling rules determine what collectors can reconstruct. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

B:

GRPC carries typed RPC streams, while gNMI supports model-based telemetry and configuration; TLS and mTLS protect and authenticate session peers. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

C:

Secure ZTP reduces manual first-boot work while requiring device identity, image integrity and confidentiality for configuration and enrollment secrets. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

Question 618

The service provider operations team has not yet approved a change. Current evidence indicates: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes. Which evidence best tests the technical diagnosis before approving a disruptive change? Select ONE best answer.

  1. Check state addresses, lock contention, plan create-update-destroy actions and expected controller changes in a sandbox.
  2. Run check mode or an isolated deployment twice, comparing targeted hosts, command diff, failed hosts and change counts.
  3. Inspect capabilities, URL module prefix, requested HTTP method, Content-Type and returned status with a nonproduction test interface.
  4. Compare exported templates, sequence counters, sampling rate, collector parsing and independently measured test-flow traffic.

Explanation

Correct Answer

C:

RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation. Applied case: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes.

Incorrect Answers

A:

Check state addresses, lock contention, plan create-update-destroy actions and expected controller changes in a sandbox. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

B:

This option addresses a different service provider engineering topic (Ansible inventory templates and idempotent configuration) rather than the documented RESTCONF HTTP methods and YANG data resources decision.

D:

Compare exported templates, sequence counters, sampling rate, collector parsing and independently measured test-flow traffic. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

Question 619

A candidate correction has been tested and the platform team requires a post-change acceptance check. Original problem: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes. The carrier operations owner needs positive and negative tests showing existing customer services remain available. Which acceptance result demonstrates correct service provider forwarding and control behavior without disrupting authorized workflows? Select ONE best answer.

  1. Approved collectors can query counters securely and unauthorized requests fail while essential traps remain observable.
  2. The service converges consistently or exposes a recoverable failure without silent partial configuration across customers.
  3. Read and write requests affect only approved modeled resources and invalid payloads receive specific diagnosable errors.
  4. Only authenticated collectors and devices exchange model-consistent telemetry, and certificate rotation can be validated without blind trust bypass.

Explanation

Correct Answer

C:

RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation. The result must be validated using the documented device, service or access context.

Incorrect Answers

A:

Approved collectors can query counters securely and unauthorized requests fail while essential traps remain observable. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

B:

The service converges consistently or exposes a recoverable failure without silent partial configuration across customers. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

D:

Only authenticated collectors and devices exchange model-consistent telemetry, and certificate rotation can be validated without blind trust bypass. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

Question 620

For an original SPCOR service-provider engineering scenario, consider: A PE automation client uses HTTP GET to modify an interface address through a RESTCONF data resource and wonders why no state changes. Select TWO complementary steps: the targeted correction and its strongest prechange validation.

  1. Check: Check state addresses, lock contention, plan create-update-destroy actions and expected controller changes in a sandbox.
  2. Change: Align exporter and collector template handling, source interface, sampling and timeout settings, then validate interpreted flow fields.
  3. Check: Inspect capabilities, URL module prefix, requested HTTP method, Content-Type and returned status with a nonproduction test interface.
  4. Change: Select supported RESTCONF data paths and HTTP operations, preserve YANG schema types and handle documented status and error bodies.
  5. Post arbitrary plaintext IOS CLI to every RESTCONF endpoint and assume a 200 response is guaranteed.

Explanation

Correct Answer

C:

RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation. Acceptance: Read and write requests affect only approved modeled resources and invalid payloads receive specific diagnosable errors.

D:

RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation. Evidence: Inspect capabilities, URL module prefix, requested HTTP method, Content-Type and returned status with a nonproduction test interface.

Incorrect Answers

A:

Check: Check state addresses, lock contention, plan create-update-destroy actions and expected controller changes in a sandbox. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

B:

Change: Align exporter and collector template handling, source interface, sampling and timeout settings, then validate interpreted flow fields. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

E:

For this select two assessment, the shortcut changes or bypasses the necessary routing, service or operational boundary rather than correcting it. RESTCONF maps YANG-modeled resources to HTTP semantics; a valid TCP connection cannot replace correct method, content type or schema validation.

Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) (350-501) Practice Tests