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DevNet Associate (DEVASC) 200-901 Practice Test 55

Question 540

The initial implementation fails or does not meet the expected behavior. A lab router not enrolled in a central controller needs a one-off interface operational counter for troubleshooting. Which investigation should be prioritized to diagnose the problem?

  1. Inspect schema mandatory statements, validation path and returned error.
  2. Inspect router address, RESTCONF model path and operational-state response.
  3. Inspect provider resources, Ansible tasks and execution ordering.
  4. Inspect the declared leaf-list type and encoded JSON or XML representation.

Explanation

Correct Answer

B:

Inspect router address, RESTCONF model path and operational-state response. These are the relevant initial evidence checks for Device-level interface test outside controller policy. Intended action: Use a supported device-level read API such as IOS XE RESTCONF for that router rather than assuming controller inventory exists. Expected success condition: The router returns the exact interface counter without affecting other devices.

Incorrect Answers

A:

Inspect schema mandatory statements, validation path and returned error. This investigation primarily applies to Interpret YANG mandatory leaf, not the current Device-level interface test outside controller policy problem. Prioritize: Inspect router address, RESTCONF model path and operational-state response.

C:

Inspect provider resources, Ansible tasks and execution ordering. This investigation primarily applies to Terraform versus Ansible responsibilities, not the current Device-level interface test outside controller policy problem. Prioritize: Inspect router address, RESTCONF model path and operational-state response.

D:

Inspect the declared leaf-list type and encoded JSON or XML representation. This investigation primarily applies to Interpret YANG leaf-list of DNS servers, not the current Device-level interface test outside controller policy problem. Prioritize: Inspect router address, RESTCONF model path and operational-state response.

Question 541

A Cisco network automation team has this requirement: A routing automation alters BGP policy on 40 sites and the team wants to test route convergence without affecting production neighbors. Which design or implementation action best addresses it?

  1. Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout.
  2. Define the supported infrastructure in version-controlled Terraform configuration and apply reviewed plans.
  3. Validate intended configuration against a supported YANG/schema and platform capability constraints before applying changes.
  4. Use a supported device-level read API such as IOS XE RESTCONF for that router rather than assuming controller inventory exists.

Explanation

Correct Answer

A:

Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout. Technical reason: Network simulation provides a safe environment for examining design behavior before live deployment. Verify by: The simulated change yields expected route reachability and no simulated loop under the tested failure cases. Deployment qualification: Simulation fidelity depends on matching images, configuration and external dependencies.

Incorrect Answers

B:

Define the supported infrastructure in version-controlled Terraform configuration and apply reviewed plans. This instead targets the different case Terraform declared state for repeatable sites. The described Cisco Modeling Labs topology before production change requirement specifically calls for Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout.

C:

Validate intended configuration against a supported YANG/schema and platform capability constraints before applying changes. This instead targets the different case Validate interface constraints before rollout. The described Cisco Modeling Labs topology before production change requirement specifically calls for Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout.

D:

Use a supported device-level read API such as IOS XE RESTCONF for that router rather than assuming controller inventory exists. This instead targets the different case Device-level interface test outside controller policy. The described Cisco Modeling Labs topology before production change requirement specifically calls for Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout.

Question 542

After deployment, an engineer must prove the proposed solution works. A routing automation alters BGP policy on 40 sites and the team wants to test route convergence without affecting production neighbors. Which observed result is the most direct acceptance evidence?

  1. The transaction is reported failed and no unauthorized configuration change is claimed.
  2. The validator rejects key-only data and accepts the object containing the mandatory field.
  3. A fixture containing two devices produces two correctly labeled status rows without writes.
  4. The simulated change yields expected route reachability and no simulated loop under the tested failure cases.

Explanation

Correct Answer

D:

The simulated change yields expected route reachability and no simulated loop under the tested failure cases. Recommended implementation: Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout. Why the observation matters: Network simulation provides a safe environment for examining design behavior before live deployment.

Incorrect Answers

A:

The transaction is reported failed and no unauthorized configuration change is claimed. That observation could confirm Interpret NETCONF rpc-error response, not the current Cisco Modeling Labs topology before production change case. For this case, the decisive observation is: The simulated change yields expected route reachability and no simulated loop under the tested failure cases.

B:

The validator rejects key-only data and accepts the object containing the mandatory field. That observation could confirm Interpret YANG mandatory leaf, not the current Cisco Modeling Labs topology before production change case. For this case, the decisive observation is: The simulated change yields expected route reachability and no simulated loop under the tested failure cases.

C:

A fixture containing two devices produces two correctly labeled status rows without writes. That observation could confirm Interpret Catalyst Center device health report, not the current Cisco Modeling Labs topology before production change case. For this case, the decisive observation is: The simulated change yields expected route reachability and no simulated loop under the tested failure cases.

Question 543

A developer is explaining the underlying technical behavior. A routing automation alters BGP policy on 40 sites and the team wants to test route convergence without affecting production neighbors. Which principle is most relevant to this case?

  1. Unified diff includes surrounding unchanged text to orient a patch hunk.
  2. NETCONF RPC replies distinguish success acknowledgements from structured error elements.
  3. Sequence diagrams order interactions among participants and show request/response dependencies.
  4. Network simulation provides a safe environment for examining design behavior before live deployment.

Explanation

Correct Answer

D:

Network simulation provides a safe environment for examining design behavior before live deployment. This mechanism explains Cisco Modeling Labs topology before production change. Action: Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout. Expected confirmation: The simulated change yields expected route reachability and no simulated loop under the tested failure cases.

Incorrect Answers

A:

Unified diff includes surrounding unchanged text to orient a patch hunk. This relates to Unified diff context versus change lines. In the current Cisco Modeling Labs topology before production change case the operative principle is: Network simulation provides a safe environment for examining design behavior before live deployment.

B:

NETCONF RPC replies distinguish success acknowledgements from structured error elements. This relates to Interpret NETCONF rpc-error response. In the current Cisco Modeling Labs topology before production change case the operative principle is: Network simulation provides a safe environment for examining design behavior before live deployment.

C:

Sequence diagrams order interactions among participants and show request/response dependencies. This relates to Sequence diagram shows token then inventory. In the current Cisco Modeling Labs topology before production change case the operative principle is: Network simulation provides a safe environment for examining design behavior before live deployment.

Question 544

A team does not apply the necessary control or correction. A routing automation alters BGP policy on 40 sites and the team wants to test route convergence without affecting production neighbors. Which resulting failure or risk is most directly relevant?

  1. Deploying an untested BGP route-map can blackhole remote applications at scale.
  2. Ignoring failed network tests can spread an outage despite available detection.
  3. Skipping mandatory modeled values produces invalid configuration despite an authentic session.
  4. Click-ops provisioning creates inconsistent configuration and weak change history.

Explanation

Correct Answer

A:

Deploying an untested BGP route-map can blackhole remote applications at scale. This is the direct exposure for Cisco Modeling Labs topology before production change. Mitigate with: Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout. Check success by: The simulated change yields expected route reachability and no simulated loop under the tested failure cases.

Incorrect Answers

B:

Ignoring failed network tests can spread an outage despite available detection. This risk occurs in the different Block a network rollout on failed pyATS checks situation. For the given Cisco Modeling Labs topology before production change requirement, the directly relevant risk is: Deploying an untested BGP route-map can blackhole remote applications at scale.

C:

Skipping mandatory modeled values produces invalid configuration despite an authentic session. This risk occurs in the different Interpret YANG mandatory leaf situation. For the given Cisco Modeling Labs topology before production change requirement, the directly relevant risk is: Deploying an untested BGP route-map can blackhole remote applications at scale.

D:

Click-ops provisioning creates inconsistent configuration and weak change history. This risk occurs in the different Terraform declared state for repeatable sites situation. For the given Cisco Modeling Labs topology before production change requirement, the directly relevant risk is: Deploying an untested BGP route-map can blackhole remote applications at scale.

Question 545

The initial implementation fails or does not meet the expected behavior. A routing automation alters BGP policy on 40 sites and the team wants to test route convergence without affecting production neighbors. Which investigation should be prioritized to diagnose the problem?

  1. Inspect CML node connections, learned routes and failure-test outcomes.
  2. Inspect test exit codes, stage dependencies and promotion logs.
  3. Inspect error-tag, error-message, selected datastore and user role.
  4. Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST.

Explanation

Correct Answer

A:

Inspect CML node connections, learned routes and failure-test outcomes. These are the relevant initial evidence checks for Cisco Modeling Labs topology before production change. Intended action: Model the relevant topology and protocol settings in Cisco Modeling Labs before the controlled rollout. Expected success condition: The simulated change yields expected route reachability and no simulated loop under the tested failure cases.

Incorrect Answers

B:

Inspect test exit codes, stage dependencies and promotion logs. This investigation primarily applies to Block a network rollout on failed pyATS checks, not the current Cisco Modeling Labs topology before production change problem. Prioritize: Inspect CML node connections, learned routes and failure-test outcomes.

C:

Inspect error-tag, error-message, selected datastore and user role. This investigation primarily applies to Interpret NETCONF rpc-error response, not the current Cisco Modeling Labs topology before production change problem. Prioritize: Inspect CML node connections, learned routes and failure-test outcomes.

D:

Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST. This investigation primarily applies to Interpret RESTCONF configuration retrieval, not the current Cisco Modeling Labs topology before production change problem. Prioritize: Inspect CML node connections, learned routes and failure-test outcomes.

Question 546

A Cisco network automation team has this requirement: An engineer compares pre- and post-maintenance routing tables by eyeballing raw CLI output from thirty routers. Which design or implementation action best addresses it?

  1. Use a modeled desired-state data representation and supported device programmatic interfaces for reconciliation.
  2. Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release.
  3. Interpret the OR branch as creating svc_bot only when the id lookup fails.
  4. Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces.

Explanation

Correct Answer

D:

Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces. Technical reason: pyATS can collect and parse network state into structured data for repeatable tests. Verify by: The automated pre/post report flags only the intended route deltas and catches a missing neighbor. Deployment qualification: Parsers and platform command support must be compatible with the device software.

Incorrect Answers

A:

Use a modeled desired-state data representation and supported device programmatic interfaces for reconciliation. This instead targets the different case Desired-state YANG instead of CLI scraping. The described pyATS structured network state verification requirement specifically calls for Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces.

B:

Block merge, revoke any exposed secret, and require reviewer-approved secret injection before release. This instead targets the different case Peer review catches hard-coded credential. The described pyATS structured network state verification requirement specifically calls for Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces.

C:

Interpret the OR branch as creating svc_bot only when the id lookup fails. This instead targets the different case Bash user creation guarded by id. The described pyATS structured network state verification requirement specifically calls for Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces.

Question 547

After deployment, an engineer must prove the proposed solution works. An engineer compares pre- and post-maintenance routing tables by eyeballing raw CLI output from thirty routers. Which observed result is the most direct acceptance evidence?

  1. The final patch targets only pilot sites and demonstrates a safe failure recovery path.
  2. The automated pre/post report flags only the intended route deltas and catches a missing neighbor.
  3. A sample of networks shows consistent guest access policy after the controller operation and local device convergence.
  4. Two independently built test environments show matching expected VPC/subnet/network properties.

Explanation

Correct Answer

B:

The automated pre/post report flags only the intended route deltas and catches a missing neighbor. Recommended implementation: Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces. Why the observation matters: pyATS can collect and parse network state into structured data for repeatable tests.

Incorrect Answers

A:

The final patch targets only pilot sites and demonstrates a safe failure recovery path. That observation could confirm Review deployment blast radius and rollback, not the current pyATS structured network state verification case. For this case, the decisive observation is: The automated pre/post report flags only the intended route deltas and catches a missing neighbor.

C:

A sample of networks shows consistent guest access policy after the controller operation and local device convergence. That observation could confirm Controller-level Wi-Fi policy at multiple sites, not the current pyATS structured network state verification case. For this case, the decisive observation is: The automated pre/post report flags only the intended route deltas and catches a missing neighbor.

D:

Two independently built test environments show matching expected VPC/subnet/network properties. That observation could confirm Terraform declared state for repeatable sites, not the current pyATS structured network state verification case. For this case, the decisive observation is: The automated pre/post report flags only the intended route deltas and catches a missing neighbor.

Question 548

A developer is explaining the underlying technical behavior. An engineer compares pre- and post-maintenance routing tables by eyeballing raw CLI output from thirty routers. Which principle is most relevant to this case?

  1. pyATS can collect and parse network state into structured data for repeatable tests.
  2. Infrastructure CI/CD embeds policy tests and staged delivery before state mutation.
  3. Ansible state: present requests the target resource exist; state: absent requests removal.
  4. Unified diff includes surrounding unchanged text to orient a patch hunk.

Explanation

Correct Answer

A:

pyATS can collect and parse network state into structured data for repeatable tests. This mechanism explains pyATS structured network state verification. Action: Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces. Expected confirmation: The automated pre/post report flags only the intended route deltas and catches a missing neighbor.

Incorrect Answers

B:

Infrastructure CI/CD embeds policy tests and staged delivery before state mutation. This relates to Infrastructure pipeline validate before apply. In the current pyATS structured network state verification case the operative principle is: pyATS can collect and parse network state into structured data for repeatable tests.

C:

Ansible state: present requests the target resource exist; state: absent requests removal. This relates to Ansible package installation state. In the current pyATS structured network state verification case the operative principle is: pyATS can collect and parse network state into structured data for repeatable tests.

D:

Unified diff includes surrounding unchanged text to orient a patch hunk. This relates to Unified diff context versus change lines. In the current pyATS structured network state verification case the operative principle is: pyATS can collect and parse network state into structured data for repeatable tests.

Question 549

A team does not apply the necessary control or correction. An engineer compares pre- and post-maintenance routing tables by eyeballing raw CLI output from thirty routers. Which resulting failure or risk is most directly relevant?

  1. Manual comparison across large CLI transcripts may miss subtle omissions.
  2. Bulk-pushing malformed values may cause partial failures and config drift.
  3. Misreading the command can lead to premature deletion or underestimated storage recovery.
  4. Skipping the polling phase creates false completion reports.

Explanation

Correct Answer

A:

Manual comparison across large CLI transcripts may miss subtle omissions. This is the direct exposure for pyATS structured network state verification. Mitigate with: Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces. Check success by: The automated pre/post report flags only the intended route deltas and catches a missing neighbor.

Incorrect Answers

B:

Bulk-pushing malformed values may cause partial failures and config drift. This risk occurs in the different Validate interface constraints before rollout situation. For the given pyATS structured network state verification requirement, the directly relevant risk is: Manual comparison across large CLI transcripts may miss subtle omissions.

C:

Misreading the command can lead to premature deletion or underestimated storage recovery. This risk occurs in the different Bash script conditional cleanup workflow situation. For the given pyATS structured network state verification requirement, the directly relevant risk is: Manual comparison across large CLI transcripts may miss subtle omissions.

D:

Skipping the polling phase creates false completion reports. This risk occurs in the different Sequence diagram 202 job polling loop situation. For the given pyATS structured network state verification requirement, the directly relevant risk is: Manual comparison across large CLI transcripts may miss subtle omissions.

Question 550

The initial implementation fails or does not meet the expected behavior. An engineer compares pre- and post-maintenance routing tables by eyeballing raw CLI output from thirty routers. Which investigation should be prioritized to diagnose the problem?

  1. Inspect test exit codes, stage dependencies and promotion logs.
  2. Inspect parsed show results, test definitions and baseline snapshots.
  3. Inspect iteration source, site allowlist, diff and reviewer approval.
  4. Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST.

Explanation

Correct Answer

B:

Inspect parsed show results, test definitions and baseline snapshots. These are the relevant initial evidence checks for pyATS structured network state verification. Intended action: Use pyATS/Genie structured parsing and automated comparison for relevant learned routes and interfaces. Expected success condition: The automated pre/post report flags only the intended route deltas and catches a missing neighbor.

Incorrect Answers

A:

Inspect test exit codes, stage dependencies and promotion logs. This investigation primarily applies to Block a network rollout on failed pyATS checks, not the current pyATS structured network state verification problem. Prioritize: Inspect parsed show results, test definitions and baseline snapshots.

C:

Inspect iteration source, site allowlist, diff and reviewer approval. This investigation primarily applies to Review deployment blast radius and rollback, not the current pyATS structured network state verification problem. Prioritize: Inspect parsed show results, test definitions and baseline snapshots.

D:

Inspect resource path, HTTP method, module data and the absence of PATCH/PUT/POST. This investigation primarily applies to Interpret RESTCONF configuration retrieval, not the current pyATS structured network state verification problem. Prioritize: Inspect parsed show results, test definitions and baseline snapshots.

DevNet Associate (DEVASC) (200-901) Practice Tests

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