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DevNet Associate (DEVASC) 200-901 Practice Test 9

Question 80

The initial implementation fails or does not meet the expected behavior. One 500-line function fetches devices, filters status, writes CSV and sends email so a minor formatting change breaks API access. Which investigation should be prioritized to diagnose the problem?

  1. Inspect function boundaries, call graph and tests for each responsibility.
  2. Inspect git status, conflicted hunks, resolution diff and unit tests.
  3. Inspect branch tips, pull requests, conflict resolution and resulting history.
  4. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Explanation

Correct Answer

A:

Inspect function boundaries, call graph and tests for each responsibility. These are the relevant initial evidence checks for Single responsibility for inventory processing. Intended action: Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs. Expected success condition: A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.

Incorrect Answers

B:

Inspect git status, conflicted hunks, resolution diff and unit tests. This investigation primarily applies to Resolve a merge conflict rather than force-push, not the current Single responsibility for inventory processing problem. Prioritize: Inspect function boundaries, call graph and tests for each responsibility.

C:

Inspect branch tips, pull requests, conflict resolution and resulting history. This investigation primarily applies to Branch isolation for competing fixes, not the current Single responsibility for inventory processing problem. Prioritize: Inspect function boundaries, call graph and tests for each responsibility.

D:

Capture outbound Content-Type and body bytes, and compare them against the endpoint example. This investigation primarily applies to YAML config versus JSON API body, not the current Single responsibility for inventory processing problem. Prioritize: Inspect function boundaries, call graph and tests for each responsibility.

Question 81

A Cisco network automation team has this requirement: A web interface for network inventory mixes SQL queries and HTML rendering in every request handler, making API output inconsistent across pages. Which design or implementation action best addresses it?

  1. Use separate Git branches and review changes before merging into the shared main branch.
  2. Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge.
  3. Use yaml.safe_load with schema validation for the untrusted configuration document.
  4. Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities.

Explanation

Correct Answer

D:

Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities. Technical reason: MVC separates state/data, interaction coordination and user-interface rendering. Verify by: A new view format reuses the inventory model without duplicating database retrieval logic. Deployment qualification: MVC is an organizing pattern; it does not automatically enforce authentication or authorization.

Incorrect Answers

A:

Use separate Git branches and review changes before merging into the shared main branch. This instead targets the different case Branch isolation for competing fixes. The described MVC isolates controller logic from UI requirement specifically calls for Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities.

B:

Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge. This instead targets the different case Resolve a merge conflict rather than force-push. The described MVC isolates controller logic from UI requirement specifically calls for Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities.

C:

Use yaml.safe_load with schema validation for the untrusted configuration document. This instead targets the different case Safely parse YAML without object construction. The described MVC isolates controller logic from UI requirement specifically calls for Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities.

Question 82

After deployment, an engineer must prove the proposed solution works. A web interface for network inventory mixes SQL queries and HTML rendering in every request handler, making API output inconsistent across pages. Which observed result is the most direct acceptance evidence?

  1. A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.
  2. The new test fails against an empty implementation and passes after the correct selection function is added.
  3. Repeated offline test runs yield identical output regardless of sandbox uptime.
  4. A new view format reuses the inventory model without duplicating database retrieval logic.

Explanation

Correct Answer

D:

A new view format reuses the inventory model without duplicating database retrieval logic. Recommended implementation: Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities. Why the observation matters: MVC separates state/data, interaction coordination and user-interface rendering.

Incorrect Answers

A:

A changed CSV formatter passes independent tests without modifying the HTTP retrieval function. That observation could confirm Single responsibility for inventory processing, not the current MVC isolates controller logic from UI case. For this case, the decisive observation is: A new view format reuses the inventory model without duplicating database retrieval logic.

B:

The new test fails against an empty implementation and passes after the correct selection function is added. That observation could confirm Write a failing test before implementation, not the current MVC isolates controller logic from UI case. For this case, the decisive observation is: A new view format reuses the inventory model without duplicating database retrieval logic.

C:

Repeated offline test runs yield identical output regardless of sandbox uptime. That observation could confirm Mock external HTTP calls in unit tests, not the current MVC isolates controller logic from UI case. For this case, the decisive observation is: A new view format reuses the inventory model without duplicating database retrieval logic.

Question 83

A developer is explaining the underlying technical behavior. A web interface for network inventory mixes SQL queries and HTML rendering in every request handler, making API output inconsistent across pages. Which principle is most relevant to this case?

  1. Git separates working-tree edits from the staging index and committed snapshot.
  2. Waterfall emphasizes phase ordering and upfront specification for stable scopes.
  3. MVC separates state/data, interaction coordination and user-interface rendering.
  4. Unit tests isolate the component being tested from uncontrollable network dependencies.

Explanation

Correct Answer

C:

MVC separates state/data, interaction coordination and user-interface rendering. This mechanism explains MVC isolates controller logic from UI. Action: Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities. Expected confirmation: A new view format reuses the inventory model without duplicating database retrieval logic.

Incorrect Answers

A:

Git separates working-tree edits from the staging index and committed snapshot. This relates to Stage only the intended file before commit. In the current MVC isolates controller logic from UI case the operative principle is: MVC separates state/data, interaction coordination and user-interface rendering.

B:

Waterfall emphasizes phase ordering and upfront specification for stable scopes. This relates to Waterfall for a tightly approved migration. In the current MVC isolates controller logic from UI case the operative principle is: MVC separates state/data, interaction coordination and user-interface rendering.

D:

Unit tests isolate the component being tested from uncontrollable network dependencies. This relates to Mock external HTTP calls in unit tests. In the current MVC isolates controller logic from UI case the operative principle is: MVC separates state/data, interaction coordination and user-interface rendering.

Question 84

A team does not apply the necessary control or correction. A web interface for network inventory mixes SQL queries and HTML rendering in every request handler, making API output inconsistent across pages. Which resulting failure or risk is most directly relevant?

  1. The string "false" is truthy in Python and could mistakenly enable a feature.
  2. Mixing rendering and persistence in handlers creates duplication and fragile updates.
  3. Relying on the author's summary can miss security-sensitive changes hidden in the patch.
  4. Unsafe deserialization can instantiate executable objects from attacker-controlled YAML.

Explanation

Correct Answer

B:

Mixing rendering and persistence in handlers creates duplication and fragile updates. This is the direct exposure for MVC isolates controller logic from UI. Mitigate with: Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities. Check success by: A new view format reuses the inventory model without duplicating database retrieval logic.

Incorrect Answers

A:

The string "false" is truthy in Python and could mistakenly enable a feature. This risk occurs in the different Preserve numeric and boolean data types situation. For the given MVC isolates controller logic from UI requirement, the directly relevant risk is: Mixing rendering and persistence in handlers creates duplication and fragile updates.

C:

Relying on the author's summary can miss security-sensitive changes hidden in the patch. This risk occurs in the different Use git diff before reviewing an endpoint change situation. For the given MVC isolates controller logic from UI requirement, the directly relevant risk is: Mixing rendering and persistence in handlers creates duplication and fragile updates.

D:

Unsafe deserialization can instantiate executable objects from attacker-controlled YAML. This risk occurs in the different Safely parse YAML without object construction situation. For the given MVC isolates controller logic from UI requirement, the directly relevant risk is: Mixing rendering and persistence in handlers creates duplication and fragile updates.

Question 85

The initial implementation fails or does not meet the expected behavior. A web interface for network inventory mixes SQL queries and HTML rendering in every request handler, making API output inconsistent across pages. Which investigation should be prioritized to diagnose the problem?

  1. Inspect baseline requirements, stage-gate evidence and approved change requests.
  2. Inspect route functions, model access layer and view templates after a sample field change.
  3. Inspect workflow timestamps, queue residence times and repeated manual transitions.
  4. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Explanation

Correct Answer

B:

Inspect route functions, model access layer and view templates after a sample field change. These are the relevant initial evidence checks for MVC isolates controller logic from UI. Intended action: Separate inventory model access, request/controller coordination and view presentation according to MVC responsibilities. Expected success condition: A new view format reuses the inventory model without duplicating database retrieval logic.

Incorrect Answers

A:

Inspect baseline requirements, stage-gate evidence and approved change requests. This investigation primarily applies to Waterfall for a tightly approved migration, not the current MVC isolates controller logic from UI problem. Prioritize: Inspect route functions, model access layer and view templates after a sample field change.

C:

Inspect workflow timestamps, queue residence times and repeated manual transitions. This investigation primarily applies to Lean removal of redundant handoffs, not the current MVC isolates controller logic from UI problem. Prioritize: Inspect route functions, model access layer and view templates after a sample field change.

D:

Capture outbound Content-Type and body bytes, and compare them against the endpoint example. This investigation primarily applies to YAML config versus JSON API body, not the current MVC isolates controller logic from UI problem. Prioritize: Inspect route functions, model access layer and view templates after a sample field change.

Question 86

A Cisco network automation team has this requirement: Several dashboard components must react when an inventory service reports a device down, but the polling service directly calls every UI component. Which design or implementation action best addresses it?

  1. Publish a device-state event and let independent registered subscribers handle notifications.
  2. Create a client class encapsulating per-controller session state and place reusable classes in an importable module.
  3. Keep reviewed automation source in Git with commits, authorship, and change messages.
  4. Compare the proposed branch against the approved base with git diff to identify all altered lines.

Explanation

Correct Answer

A:

Publish a device-state event and let independent registered subscribers handle notifications. Technical reason: Observer decouples event producers from multiple dependent consumers. Verify by: Two subscribers receive the same state-change event without the publisher importing their implementations. Deployment qualification: Observers need lifecycle management to avoid missed events or duplicate subscriptions.

Incorrect Answers

B:

Create a client class encapsulating per-controller session state and place reusable classes in an importable module. This instead targets the different case Separate classes from modules for network clients. The described Observer for device event subscribers requirement specifically calls for Publish a device-state event and let independent registered subscribers handle notifications.

C:

Keep reviewed automation source in Git with commits, authorship, and change messages. This instead targets the different case Git history for configuration rollback. The described Observer for device event subscribers requirement specifically calls for Publish a device-state event and let independent registered subscribers handle notifications.

D:

Compare the proposed branch against the approved base with git diff to identify all altered lines. This instead targets the different case Use git diff before reviewing an endpoint change. The described Observer for device event subscribers requirement specifically calls for Publish a device-state event and let independent registered subscribers handle notifications.

Question 87

After deployment, an engineer must prove the proposed solution works. Several dashboard components must react when an inventory service reports a device down, but the polling service directly calls every UI component. Which observed result is the most direct acceptance evidence?

  1. Two subscribers receive the same state-change event without the publisher importing their implementations.
  2. Two controller clients operate independently without mixing bearer tokens or base URLs.
  3. A fixture containing interface counters loads into the expected Python dictionary without an XML conversion stage.
  4. Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.

Explanation

Correct Answer

A:

Two subscribers receive the same state-change event without the publisher importing their implementations. Recommended implementation: Publish a device-state event and let independent registered subscribers handle notifications. Why the observation matters: Observer decouples event producers from multiple dependent consumers.

Incorrect Answers

B:

Two controller clients operate independently without mixing bearer tokens or base URLs. That observation could confirm Separate classes from modules for network clients, not the current Observer for device event subscribers case. For this case, the decisive observation is: Two subscribers receive the same state-change event without the publisher importing their implementations.

C:

A fixture containing interface counters loads into the expected Python dictionary without an XML conversion stage. That observation could confirm JSON versus XML for a telemetry consumer, not the current Observer for device event subscribers case. For this case, the decisive observation is: Two subscribers receive the same state-change event without the publisher importing their implementations.

D:

Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback. That observation could confirm Agile iteration for uncertain feature requirements, not the current Observer for device event subscribers case. For this case, the decisive observation is: Two subscribers receive the same state-change event without the publisher importing their implementations.

Question 88

A developer is explaining the underlying technical behavior. Several dashboard components must react when an inventory service reports a device down, but the polling service directly calls every UI component. Which principle is most relevant to this case?

  1. Unit tests isolate the component being tested from uncontrollable network dependencies.
  2. Observer decouples event producers from multiple dependent consumers.
  3. Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.
  4. JSON booleans and numbers map to typed Python values rather than text representations.

Explanation

Correct Answer

B:

Observer decouples event producers from multiple dependent consumers. This mechanism explains Observer for device event subscribers. Action: Publish a device-state event and let independent registered subscribers handle notifications. Expected confirmation: Two subscribers receive the same state-change event without the publisher importing their implementations.

Incorrect Answers

A:

Unit tests isolate the component being tested from uncontrollable network dependencies. This relates to Mock external HTTP calls in unit tests. In the current Observer for device event subscribers case the operative principle is: Observer decouples event producers from multiple dependent consumers.

C:

Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge. This relates to Resolve a merge conflict rather than force-push. In the current Observer for device event subscribers case the operative principle is: Observer decouples event producers from multiple dependent consumers.

D:

JSON booleans and numbers map to typed Python values rather than text representations. This relates to Preserve numeric and boolean data types. In the current Observer for device event subscribers case the operative principle is: Observer decouples event producers from multiple dependent consumers.

Question 89

A team does not apply the necessary control or correction. Several dashboard components must react when an inventory service reports a device down, but the polling service directly calls every UI component. Which resulting failure or risk is most directly relevant?

  1. Uncontrolled scope changes during deployment would violate documented compliance signoffs.
  2. Hard-coded callbacks from publisher to every consumer make new subscribers require core changes.
  3. Shared mutable globals can send one site's authorization header to another controller.
  4. Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement.

Explanation

Correct Answer

B:

Hard-coded callbacks from publisher to every consumer make new subscribers require core changes. This is the direct exposure for Observer for device event subscribers. Mitigate with: Publish a device-state event and let independent registered subscribers handle notifications. Check success by: Two subscribers receive the same state-change event without the publisher importing their implementations.

Incorrect Answers

A:

Uncontrolled scope changes during deployment would violate documented compliance signoffs. This risk occurs in the different Waterfall for a tightly approved migration situation. For the given Observer for device event subscribers requirement, the directly relevant risk is: Hard-coded callbacks from publisher to every consumer make new subscribers require core changes.

C:

Shared mutable globals can send one site's authorization header to another controller. This risk occurs in the different Separate classes from modules for network clients situation. For the given Observer for device event subscribers requirement, the directly relevant risk is: Hard-coded callbacks from publisher to every consumer make new subscribers require core changes.

D:

Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement. This risk occurs in the different Write a failing test before implementation situation. For the given Observer for device event subscribers requirement, the directly relevant risk is: Hard-coded callbacks from publisher to every consumer make new subscribers require core changes.

Question 90

The initial implementation fails or does not meet the expected behavior. Several dashboard components must react when an inventory service reports a device down, but the polling service directly calls every UI component. Which investigation should be prioritized to diagnose the problem?

  1. Review loader API, accepted YAML tags, and a controlled rejection test.
  2. Inspect subscriber registration, event dispatch and a controlled down/up notification test.
  3. Inspect baseline requirements, stage-gate evidence and approved change requests.
  4. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Explanation

Correct Answer

B:

Inspect subscriber registration, event dispatch and a controlled down/up notification test. These are the relevant initial evidence checks for Observer for device event subscribers. Intended action: Publish a device-state event and let independent registered subscribers handle notifications. Expected success condition: Two subscribers receive the same state-change event without the publisher importing their implementations.

Incorrect Answers

A:

Review loader API, accepted YAML tags, and a controlled rejection test. This investigation primarily applies to Safely parse YAML without object construction, not the current Observer for device event subscribers problem. Prioritize: Inspect subscriber registration, event dispatch and a controlled down/up notification test.

C:

Inspect baseline requirements, stage-gate evidence and approved change requests. This investigation primarily applies to Waterfall for a tightly approved migration, not the current Observer for device event subscribers problem. Prioritize: Inspect subscriber registration, event dispatch and a controlled down/up notification test.

D:

Capture outbound Content-Type and body bytes, and compare them against the endpoint example. This investigation primarily applies to YAML config versus JSON API body, not the current Observer for device event subscribers problem. Prioritize: Inspect subscriber registration, event dispatch and a controlled down/up notification test.

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

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