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DevNet Associate (DEVASC) 200-901 Practice Test 8

Question 70

The initial implementation fails or does not meet the expected behavior. Four scripts contain nearly identical request retry blocks and one has a stale backoff rule after an API rate-limit change. Which investigation should be prioritized to diagnose the problem?

  1. Inspect git status, conflicted hunks, resolution diff and unit tests.
  2. Inspect baseline requirements, stage-gate evidence and approved change requests.
  3. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.
  4. Inspect import call sites, versioned helper implementation and retry-unit tests.

Explanation

Correct Answer

D:

Inspect import call sites, versioned helper implementation and retry-unit tests. These are the relevant initial evidence checks for Extract repeated API retry logic into a function. Intended action: Centralize retry handling in a reusable, tested function parameterized by status and retry bounds. Expected success condition: All four callers use the same bounded retry behavior when a simulated 429 occurs.

Incorrect Answers

A:

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 Extract repeated API retry logic into a function problem. Prioritize: Inspect import call sites, versioned helper implementation and retry-unit tests.

B:

Inspect baseline requirements, stage-gate evidence and approved change requests. This investigation primarily applies to Waterfall for a tightly approved migration, not the current Extract repeated API retry logic into a function problem. Prioritize: Inspect import call sites, versioned helper implementation and retry-unit tests.

C:

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 Extract repeated API retry logic into a function problem. Prioritize: Inspect import call sites, versioned helper implementation and retry-unit tests.

Question 71

A Cisco network automation team has this requirement: A developer stores device credentials, session settings and HTTP methods in global variables shared across unrelated controller scripts. Which design or implementation action best addresses it?

  1. Publish a device-state event and let independent registered subscribers handle notifications.
  2. Add a persistent unit test asserting correct handling of an empty list alongside normal nonempty fixtures.
  3. Create a client class encapsulating per-controller session state and place reusable classes in an importable module.
  4. Use response.json() then iterate the list under the devices key to access each device dictionary.

Explanation

Correct Answer

C:

Create a client class encapsulating per-controller session state and place reusable classes in an importable module. Technical reason: Classes group state with related behavior while modules organize reusable definitions. Verify by: Two controller clients operate independently without mixing bearer tokens or base URLs. Deployment qualification: Secret material must still come from a secure source and never appear in repr or logs.

Incorrect Answers

A:

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

B:

Add a persistent unit test asserting correct handling of an empty list alongside normal nonempty fixtures. This instead targets the different case Regression test after parser bug fix. The described Separate classes from modules for network clients requirement specifically calls for Create a client class encapsulating per-controller session state and place reusable classes in an importable module.

D:

Use response.json() then iterate the list under the devices key to access each device dictionary. This instead targets the different case Parse nested device lists into Python. The described Separate classes from modules for network clients requirement specifically calls for Create a client class encapsulating per-controller session state and place reusable classes in an importable module.

Question 72

After deployment, an engineer must prove the proposed solution works. A developer stores device credentials, session settings and HTTP methods in global variables shared across unrelated controller scripts. Which observed result is the most direct acceptance evidence?

  1. Measured lead time decreases without bypassing security review or deployment verification.
  2. The disabled flag evaluates false and the integer retry count remains zero without string comparisons.
  3. Both improvements arrive as distinct commits with an auditable merge history.
  4. Two controller clients operate independently without mixing bearer tokens or base URLs.

Explanation

Correct Answer

D:

Two controller clients operate independently without mixing bearer tokens or base URLs. Recommended implementation: Create a client class encapsulating per-controller session state and place reusable classes in an importable module. Why the observation matters: Classes group state with related behavior while modules organize reusable definitions.

Incorrect Answers

A:

Measured lead time decreases without bypassing security review or deployment verification. That observation could confirm Lean removal of redundant handoffs, not the current Separate classes from modules for network clients case. For this case, the decisive observation is: Two controller clients operate independently without mixing bearer tokens or base URLs.

B:

The disabled flag evaluates false and the integer retry count remains zero without string comparisons. That observation could confirm Preserve numeric and boolean data types, not the current Separate classes from modules for network clients case. For this case, the decisive observation is: Two controller clients operate independently without mixing bearer tokens or base URLs.

C:

Both improvements arrive as distinct commits with an auditable merge history. That observation could confirm Branch isolation for competing fixes, not the current Separate classes from modules for network clients case. For this case, the decisive observation is: Two controller clients operate independently without mixing bearer tokens or base URLs.

Question 73

A developer is explaining the underlying technical behavior. A developer stores device credentials, session settings and HTTP methods in global variables shared across unrelated controller scripts. Which principle is most relevant to this case?

  1. Classes group state with related behavior while modules organize reusable definitions.
  2. Test-driven development follows red, green, refactor with executable expected behavior.
  3. Nested JSON arrays become Python lists containing dictionary objects.
  4. Agile favors iterative delivery and adaptation as understanding evolves.

Explanation

Correct Answer

A:

Classes group state with related behavior while modules organize reusable definitions. This mechanism explains Separate classes from modules for network clients. Action: Create a client class encapsulating per-controller session state and place reusable classes in an importable module. Expected confirmation: Two controller clients operate independently without mixing bearer tokens or base URLs.

Incorrect Answers

B:

Test-driven development follows red, green, refactor with executable expected behavior. This relates to Write a failing test before implementation. In the current Separate classes from modules for network clients case the operative principle is: Classes group state with related behavior while modules organize reusable definitions.

C:

Nested JSON arrays become Python lists containing dictionary objects. This relates to Parse nested device lists into Python. In the current Separate classes from modules for network clients case the operative principle is: Classes group state with related behavior while modules organize reusable definitions.

D:

Agile favors iterative delivery and adaptation as understanding evolves. This relates to Agile iteration for uncertain feature requirements. In the current Separate classes from modules for network clients case the operative principle is: Classes group state with related behavior while modules organize reusable definitions.

Question 74

A team does not apply the necessary control or correction. A developer stores device credentials, session settings and HTTP methods in global variables shared across unrelated controller scripts. Which resulting failure or risk is most directly relevant?

  1. A singleton holding mutable authentication state risks one tenant inheriting another's credentials.
  2. Unsafe deserialization can instantiate executable objects from attacker-controlled YAML.
  3. Shared mutable globals can send one site's authorization header to another controller.
  4. Speeding coding alone leaves ticket transfer queues and idle wait time unchanged.

Explanation

Correct Answer

C:

Shared mutable globals can send one site's authorization header to another controller. This is the direct exposure for Separate classes from modules for network clients. Mitigate with: Create a client class encapsulating per-controller session state and place reusable classes in an importable module. Check success by: Two controller clients operate independently without mixing bearer tokens or base URLs.

Incorrect Answers

A:

A singleton holding mutable authentication state risks one tenant inheriting another's credentials. This risk occurs in the different Avoid Singleton for tenant-specific token clients situation. For the given Separate classes from modules for network clients requirement, the directly relevant risk is: Shared mutable globals can send one site's authorization header to another controller.

B:

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 Separate classes from modules for network clients requirement, the directly relevant risk is: Shared mutable globals can send one site's authorization header to another controller.

D:

Speeding coding alone leaves ticket transfer queues and idle wait time unchanged. This risk occurs in the different Lean removal of redundant handoffs situation. For the given Separate classes from modules for network clients requirement, the directly relevant risk is: Shared mutable globals can send one site's authorization header to another controller.

Question 75

The initial implementation fails or does not meet the expected behavior. A developer stores device credentials, session settings and HTTP methods in global variables shared across unrelated controller scripts. Which investigation should be prioritized to diagnose the problem?

  1. Inspect monkeypatch/mock targets, fixture response shape and test failure causes.
  2. Inspect branch tips, pull requests, conflict resolution and resulting history.
  3. Review the original exception, committed test fixture and deliberately broken-function test result.
  4. Inspect client constructor parameters, isolated state and calls against two mock endpoints.

Explanation

Correct Answer

D:

Inspect client constructor parameters, isolated state and calls against two mock endpoints. These are the relevant initial evidence checks for Separate classes from modules for network clients. Intended action: Create a client class encapsulating per-controller session state and place reusable classes in an importable module. Expected success condition: Two controller clients operate independently without mixing bearer tokens or base URLs.

Incorrect Answers

A:

Inspect monkeypatch/mock targets, fixture response shape and test failure causes. This investigation primarily applies to Mock external HTTP calls in unit tests, not the current Separate classes from modules for network clients problem. Prioritize: Inspect client constructor parameters, isolated state and calls against two mock endpoints.

B:

Inspect branch tips, pull requests, conflict resolution and resulting history. This investigation primarily applies to Branch isolation for competing fixes, not the current Separate classes from modules for network clients problem. Prioritize: Inspect client constructor parameters, isolated state and calls against two mock endpoints.

C:

Review the original exception, committed test fixture and deliberately broken-function test result. This investigation primarily applies to Regression test after parser bug fix, not the current Separate classes from modules for network clients problem. Prioritize: Inspect client constructor parameters, isolated state and calls against two mock endpoints.

Question 76

A Cisco network automation team has this requirement: One 500-line function fetches devices, filters status, writes CSV and sends email so a minor formatting change breaks API access. Which design or implementation action best addresses it?

  1. Keep the documented JSON payload and validate its field names and types with a JSON parser.
  2. Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic.
  3. Use response.json() then iterate the list under the devices key to access each device dictionary.
  4. Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs.

Explanation

Correct Answer

D:

Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs. Technical reason: Function decomposition reduces coupling and makes responsibilities independently testable. Verify by: A changed CSV formatter passes independent tests without modifying the HTTP retrieval function. Deployment qualification: Excessive microscopic functions are not a substitute for meaningful cohesive interfaces.

Incorrect Answers

A:

Keep the documented JSON payload and validate its field names and types with a JSON parser. This instead targets the different case JSON versus XML for a telemetry consumer. The described Single responsibility for inventory processing requirement specifically calls for Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs.

B:

Define an automated failing unit test for reserved and allocated VLAN IDs before implementing selection logic. This instead targets the different case Write a failing test before implementation. The described Single responsibility for inventory processing requirement specifically calls for Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs.

C:

Use response.json() then iterate the list under the devices key to access each device dictionary. This instead targets the different case Parse nested device lists into Python. The described Single responsibility for inventory processing requirement specifically calls for Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs.

Question 77

After deployment, an engineer must prove the proposed solution works. One 500-line function fetches devices, filters status, writes CSV and sends email so a minor formatting change breaks API access. Which observed result is the most direct acceptance evidence?

  1. A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.
  2. A new view format reuses the inventory model without duplicating database retrieval logic.
  3. A sample reply yields precisely the expected interface names even when namespace prefixes change.
  4. Both improvements arrive as distinct commits with an auditable merge history.

Explanation

Correct Answer

A:

A changed CSV formatter passes independent tests without modifying the HTTP retrieval function. Recommended implementation: Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs. Why the observation matters: Function decomposition reduces coupling and makes responsibilities independently testable.

Incorrect Answers

B:

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

C:

A sample reply yields precisely the expected interface names even when namespace prefixes change. That observation could confirm XML namespaces in network configuration, not the current Single responsibility for inventory processing case. For this case, the decisive observation is: A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.

D:

Both improvements arrive as distinct commits with an auditable merge history. That observation could confirm Branch isolation for competing fixes, not the current Single responsibility for inventory processing case. For this case, the decisive observation is: A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.

Question 78

A developer is explaining the underlying technical behavior. One 500-line function fetches devices, filters status, writes CSV and sends email so a minor formatting change breaks API access. Which principle is most relevant to this case?

  1. Lean improvement targets waste, flow and delivery efficiency.
  2. Function decomposition reduces coupling and makes responsibilities independently testable.
  3. JSON booleans and numbers map to typed Python values rather than text representations.
  4. Nested JSON arrays become Python lists containing dictionary objects.

Explanation

Correct Answer

B:

Function decomposition reduces coupling and makes responsibilities independently testable. This mechanism explains Single responsibility for inventory processing. Action: Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs. Expected confirmation: A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.

Incorrect Answers

A:

Lean improvement targets waste, flow and delivery efficiency. This relates to Lean removal of redundant handoffs. In the current Single responsibility for inventory processing case the operative principle is: Function decomposition reduces coupling and makes responsibilities independently testable.

C:

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 Single responsibility for inventory processing case the operative principle is: Function decomposition reduces coupling and makes responsibilities independently testable.

D:

Nested JSON arrays become Python lists containing dictionary objects. This relates to Parse nested device lists into Python. In the current Single responsibility for inventory processing case the operative principle is: Function decomposition reduces coupling and makes responsibilities independently testable.

Question 79

A team does not apply the necessary control or correction. One 500-line function fetches devices, filters status, writes CSV and sends email so a minor formatting change breaks API access. Which resulting failure or risk is most directly relevant?

  1. A monolithic routine propagates local presentation changes into unrelated network code.
  2. Editing one shared local copy invites lost changes and unpredictable releases.
  3. Fixing one sample without a regression test allows the failure to return unnoticed.
  4. Force-pushing one branch can discard the other fix or damage shared history.

Explanation

Correct Answer

A:

A monolithic routine propagates local presentation changes into unrelated network code. This is the direct exposure for Single responsibility for inventory processing. Mitigate with: Refactor into small functions for fetch, validate, transform and publish with clearly defined inputs and outputs. Check success by: A changed CSV formatter passes independent tests without modifying the HTTP retrieval function.

Incorrect Answers

B:

Editing one shared local copy invites lost changes and unpredictable releases. This risk occurs in the different Branch isolation for competing fixes situation. For the given Single responsibility for inventory processing requirement, the directly relevant risk is: A monolithic routine propagates local presentation changes into unrelated network code.

C:

Fixing one sample without a regression test allows the failure to return unnoticed. This risk occurs in the different Regression test after parser bug fix situation. For the given Single responsibility for inventory processing requirement, the directly relevant risk is: A monolithic routine propagates local presentation changes into unrelated network code.

D:

Force-pushing one branch can discard the other fix or damage shared history. This risk occurs in the different Resolve a merge conflict rather than force-push situation. For the given Single responsibility for inventory processing requirement, the directly relevant risk is: A monolithic routine propagates local presentation changes into unrelated network code.

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.

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

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