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DevNet Associate (DEVASC) 200-901 Practice Test 6

Question 50

The initial implementation fails or does not meet the expected behavior. A function transforms device API responses, but every unit test calls a live remote sandbox and fails whenever the network is down. Which investigation should be prioritized to diagnose the problem?

  1. Inspect the response Content-Type, sample JSON object shape and parser exceptions.
  2. Inspect monkeypatch/mock targets, fixture response shape and test failure causes.
  3. Inspect git status, conflicted hunks, resolution diff and unit tests.
  4. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Explanation

Correct Answer

B:

Inspect monkeypatch/mock targets, fixture response shape and test failure causes. These are the relevant initial evidence checks for Mock external HTTP calls in unit tests. Intended action: Inject or mock the HTTP client and test transformation using deterministic response fixtures. Expected success condition: Repeated offline test runs yield identical output regardless of sandbox uptime.

Incorrect Answers

A:

Inspect the response Content-Type, sample JSON object shape and parser exceptions. This investigation primarily applies to JSON versus XML for a telemetry consumer, not the current Mock external HTTP calls in unit tests problem. Prioritize: Inspect monkeypatch/mock targets, fixture response shape and test failure causes.

C:

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 Mock external HTTP calls in unit tests problem. Prioritize: Inspect monkeypatch/mock targets, fixture response shape and test failure causes.

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 Mock external HTTP calls in unit tests problem. Prioritize: Inspect monkeypatch/mock targets, fixture response shape and test failure causes.

Question 51

A Cisco network automation team has this requirement: A network operations team cannot specify all dashboard details upfront and expects operator feedback every two weeks. Which design or implementation action best addresses it?

  1. Keep reviewed automation source in Git with commits, authorship, and change messages.
  2. Plan short iterations with a prioritized backlog and working increments reviewed by users.
  3. Create a client class encapsulating per-controller session state and place reusable classes in an importable module.
  4. Use separately constructed tenant-scoped client instances rather than one shared mutable singleton.

Explanation

Correct Answer

B:

Plan short iterations with a prioritized backlog and working increments reviewed by users. Technical reason: Agile favors iterative delivery and adaptation as understanding evolves. Verify by: Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback. Deployment qualification: Iterations still require acceptance criteria and architecture/security constraints.

Incorrect Answers

A:

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 Agile iteration for uncertain feature requirements requirement specifically calls for Plan short iterations with a prioritized backlog and working increments reviewed by users.

C:

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 Agile iteration for uncertain feature requirements requirement specifically calls for Plan short iterations with a prioritized backlog and working increments reviewed by users.

D:

Use separately constructed tenant-scoped client instances rather than one shared mutable singleton. This instead targets the different case Avoid Singleton for tenant-specific token clients. The described Agile iteration for uncertain feature requirements requirement specifically calls for Plan short iterations with a prioritized backlog and working increments reviewed by users.

Question 52

After deployment, an engineer must prove the proposed solution works. A network operations team cannot specify all dashboard details upfront and expects operator feedback every two weeks. Which observed result is the most direct acceptance evidence?

  1. Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.
  2. A disputed rule deletion can be traced to a specific commit and compared with the prior revision.
  3. git diff --cached shows the parser change and no credential file in the staged set.
  4. The playbook configuration is readable as YAML while the outgoing request passes the service's JSON schema check.

Explanation

Correct Answer

A:

Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback. Recommended implementation: Plan short iterations with a prioritized backlog and working increments reviewed by users. Why the observation matters: Agile favors iterative delivery and adaptation as understanding evolves.

Incorrect Answers

B:

A disputed rule deletion can be traced to a specific commit and compared with the prior revision. That observation could confirm Git history for configuration rollback, not the current Agile iteration for uncertain feature requirements case. For this case, the decisive observation is: Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.

C:

git diff --cached shows the parser change and no credential file in the staged set. That observation could confirm Stage only the intended file before commit, not the current Agile iteration for uncertain feature requirements case. For this case, the decisive observation is: Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.

D:

The playbook configuration is readable as YAML while the outgoing request passes the service's JSON schema check. That observation could confirm YAML config versus JSON API body, not the current Agile iteration for uncertain feature requirements case. For this case, the decisive observation is: Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.

Question 53

A developer is explaining the underlying technical behavior. A network operations team cannot specify all dashboard details upfront and expects operator feedback every two weeks. Which principle is most relevant to this case?

  1. Agile favors iterative delivery and adaptation as understanding evolves.
  2. JSON natively expresses objects and arrays while XML represents data as elements and attributes.
  3. Functions encapsulate repeated behavior behind a single documented interface.
  4. YAML can improve human-edited configuration, but request serialization must follow the HTTP API contract.

Explanation

Correct Answer

A:

Agile favors iterative delivery and adaptation as understanding evolves. This mechanism explains Agile iteration for uncertain feature requirements. Action: Plan short iterations with a prioritized backlog and working increments reviewed by users. Expected confirmation: Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.

Incorrect Answers

B:

JSON natively expresses objects and arrays while XML represents data as elements and attributes. This relates to JSON versus XML for a telemetry consumer. In the current Agile iteration for uncertain feature requirements case the operative principle is: Agile favors iterative delivery and adaptation as understanding evolves.

C:

Functions encapsulate repeated behavior behind a single documented interface. This relates to Extract repeated API retry logic into a function. In the current Agile iteration for uncertain feature requirements case the operative principle is: Agile favors iterative delivery and adaptation as understanding evolves.

D:

YAML can improve human-edited configuration, but request serialization must follow the HTTP API contract. This relates to YAML config versus JSON API body. In the current Agile iteration for uncertain feature requirements case the operative principle is: Agile favors iterative delivery and adaptation as understanding evolves.

Question 54

A team does not apply the necessary control or correction. A network operations team cannot specify all dashboard details upfront and expects operator feedback every two weeks. Which resulting failure or risk is most directly relevant?

  1. Duplicated code can diverge and keep a known rate-limit defect in one workflow.
  2. A fixed long specification can lock in an unhelpful interface before operators see a working version.
  3. Unsafe deserialization can instantiate executable objects from attacker-controlled YAML.
  4. Live-only tests confound parser defects with connection outages and API throttling.

Explanation

Correct Answer

B:

A fixed long specification can lock in an unhelpful interface before operators see a working version. This is the direct exposure for Agile iteration for uncertain feature requirements. Mitigate with: Plan short iterations with a prioritized backlog and working increments reviewed by users. Check success by: Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.

Incorrect Answers

A:

Duplicated code can diverge and keep a known rate-limit defect in one workflow. This risk occurs in the different Extract repeated API retry logic into a function situation. For the given Agile iteration for uncertain feature requirements requirement, the directly relevant risk is: A fixed long specification can lock in an unhelpful interface before operators see a working version.

C:

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 Agile iteration for uncertain feature requirements requirement, the directly relevant risk is: A fixed long specification can lock in an unhelpful interface before operators see a working version.

D:

Live-only tests confound parser defects with connection outages and API throttling. This risk occurs in the different Mock external HTTP calls in unit tests situation. For the given Agile iteration for uncertain feature requirements requirement, the directly relevant risk is: A fixed long specification can lock in an unhelpful interface before operators see a working version.

Question 55

The initial implementation fails or does not meet the expected behavior. A network operations team cannot specify all dashboard details upfront and expects operator feedback every two weeks. Which investigation should be prioritized to diagnose the problem?

  1. Inspect git status and git diff --cached before the commit.
  2. Inspect monkeypatch/mock targets, fixture response shape and test failure causes.
  3. Inspect sprint reviews, backlog changes and delivered increments over successive iterations.
  4. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.

Explanation

Correct Answer

C:

Inspect sprint reviews, backlog changes and delivered increments over successive iterations. These are the relevant initial evidence checks for Agile iteration for uncertain feature requirements. Intended action: Plan short iterations with a prioritized backlog and working increments reviewed by users. Expected success condition: Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.

Incorrect Answers

A:

Inspect git status and git diff --cached before the commit. This investigation primarily applies to Stage only the intended file before commit, not the current Agile iteration for uncertain feature requirements problem. Prioritize: Inspect sprint reviews, backlog changes and delivered increments over successive iterations.

B:

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 Agile iteration for uncertain feature requirements problem. Prioritize: Inspect sprint reviews, backlog changes and delivered increments over successive iterations.

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 Agile iteration for uncertain feature requirements problem. Prioritize: Inspect sprint reviews, backlog changes and delivered increments over successive iterations.

Question 56

A Cisco network automation team has this requirement: A regulated switch-configuration migration has fixed contractual requirements and formal sequential design, implementation and acceptance approvals. Which design or implementation action best addresses it?

  1. Use yaml.safe_load with schema validation for the untrusted configuration document.
  2. Use a gated sequential plan with traceable signoffs where change control is mandatory.
  3. Use separate Git branches and review changes before merging into the shared main branch.
  4. Inject or mock the HTTP client and test transformation using deterministic response fixtures.

Explanation

Correct Answer

B:

Use a gated sequential plan with traceable signoffs where change control is mandatory. Technical reason: Waterfall emphasizes phase ordering and upfront specification for stable scopes. Verify by: Each approved phase has signed requirements, design, deployment and final verification artifacts. Deployment qualification: A sequential lifecycle does not eliminate the need for defect correction and test feedback.

Incorrect Answers

A:

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 Waterfall for a tightly approved migration requirement specifically calls for Use a gated sequential plan with traceable signoffs where change control is mandatory.

C:

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 Waterfall for a tightly approved migration requirement specifically calls for Use a gated sequential plan with traceable signoffs where change control is mandatory.

D:

Inject or mock the HTTP client and test transformation using deterministic response fixtures. This instead targets the different case Mock external HTTP calls in unit tests. The described Waterfall for a tightly approved migration requirement specifically calls for Use a gated sequential plan with traceable signoffs where change control is mandatory.

Question 57

After deployment, an engineer must prove the proposed solution works. A regulated switch-configuration migration has fixed contractual requirements and formal sequential design, implementation and acceptance approvals. Which observed result is the most direct acceptance evidence?

  1. Concurrent tenant tests use distinct endpoints and tokens without cross-tenant leakage.
  2. The new test fails against an empty implementation and passes after the correct selection function is added.
  3. Each approved phase has signed requirements, design, deployment and final verification artifacts.
  4. A sample reply yields precisely the expected interface names even when namespace prefixes change.

Explanation

Correct Answer

C:

Each approved phase has signed requirements, design, deployment and final verification artifacts. Recommended implementation: Use a gated sequential plan with traceable signoffs where change control is mandatory. Why the observation matters: Waterfall emphasizes phase ordering and upfront specification for stable scopes.

Incorrect Answers

A:

Concurrent tenant tests use distinct endpoints and tokens without cross-tenant leakage. That observation could confirm Avoid Singleton for tenant-specific token clients, not the current Waterfall for a tightly approved migration case. For this case, the decisive observation is: Each approved phase has signed requirements, design, deployment and final verification artifacts.

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 Waterfall for a tightly approved migration case. For this case, the decisive observation is: Each approved phase has signed requirements, design, deployment and final verification artifacts.

D:

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 Waterfall for a tightly approved migration case. For this case, the decisive observation is: Each approved phase has signed requirements, design, deployment and final verification artifacts.

Question 58

A developer is explaining the underlying technical behavior. A regulated switch-configuration migration has fixed contractual requirements and formal sequential design, implementation and acceptance approvals. Which principle is most relevant to this case?

  1. Function decomposition reduces coupling and makes responsibilities independently testable.
  2. Instance isolation is preferable when state must vary between tenants.
  3. Version control preserves an attributable history of source changes.
  4. Waterfall emphasizes phase ordering and upfront specification for stable scopes.

Explanation

Correct Answer

D:

Waterfall emphasizes phase ordering and upfront specification for stable scopes. This mechanism explains Waterfall for a tightly approved migration. Action: Use a gated sequential plan with traceable signoffs where change control is mandatory. Expected confirmation: Each approved phase has signed requirements, design, deployment and final verification artifacts.

Incorrect Answers

A:

Function decomposition reduces coupling and makes responsibilities independently testable. This relates to Single responsibility for inventory processing. In the current Waterfall for a tightly approved migration case the operative principle is: Waterfall emphasizes phase ordering and upfront specification for stable scopes.

B:

Instance isolation is preferable when state must vary between tenants. This relates to Avoid Singleton for tenant-specific token clients. In the current Waterfall for a tightly approved migration case the operative principle is: Waterfall emphasizes phase ordering and upfront specification for stable scopes.

C:

Version control preserves an attributable history of source changes. This relates to Git history for configuration rollback. In the current Waterfall for a tightly approved migration case the operative principle is: Waterfall emphasizes phase ordering and upfront specification for stable scopes.

Question 59

A team does not apply the necessary control or correction. A regulated switch-configuration migration has fixed contractual requirements and formal sequential design, implementation and acceptance approvals. Which resulting failure or risk is most directly relevant?

  1. Editing one shared local copy invites lost changes and unpredictable releases.
  2. Uncontrolled scope changes during deployment would violate documented compliance signoffs.
  3. Shared mutable globals can send one site's authorization header to another controller.
  4. Assuming every JSON level is a dictionary makes valid nested responses fail.

Explanation

Correct Answer

B:

Uncontrolled scope changes during deployment would violate documented compliance signoffs. This is the direct exposure for Waterfall for a tightly approved migration. Mitigate with: Use a gated sequential plan with traceable signoffs where change control is mandatory. Check success by: Each approved phase has signed requirements, design, deployment and final verification artifacts.

Incorrect Answers

A:

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 Waterfall for a tightly approved migration requirement, the directly relevant risk is: Uncontrolled scope changes during deployment would violate documented compliance signoffs.

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 Waterfall for a tightly approved migration requirement, the directly relevant risk is: Uncontrolled scope changes during deployment would violate documented compliance signoffs.

D:

Assuming every JSON level is a dictionary makes valid nested responses fail. This risk occurs in the different Parse nested device lists into Python situation. For the given Waterfall for a tightly approved migration requirement, the directly relevant risk is: Uncontrolled scope changes during deployment would violate documented compliance signoffs.

Question 60

The initial implementation fails or does not meet the expected behavior. A regulated switch-configuration migration has fixed contractual requirements and formal sequential design, implementation and acceptance approvals. Which investigation should be prioritized to diagnose the problem?

  1. Inspect branch tips, pull requests, conflict resolution and resulting history.
  2. Inspect namespace declarations and XPath namespace bindings against the returned XML tree.
  3. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.
  4. Inspect baseline requirements, stage-gate evidence and approved change requests.

Explanation

Correct Answer

D:

Inspect baseline requirements, stage-gate evidence and approved change requests. These are the relevant initial evidence checks for Waterfall for a tightly approved migration. Intended action: Use a gated sequential plan with traceable signoffs where change control is mandatory. Expected success condition: Each approved phase has signed requirements, design, deployment and final verification artifacts.

Incorrect Answers

A:

Inspect branch tips, pull requests, conflict resolution and resulting history. This investigation primarily applies to Branch isolation for competing fixes, not the current Waterfall for a tightly approved migration problem. Prioritize: Inspect baseline requirements, stage-gate evidence and approved change requests.

B:

Inspect namespace declarations and XPath namespace bindings against the returned XML tree. This investigation primarily applies to XML namespaces in network configuration, not the current Waterfall for a tightly approved migration problem. Prioritize: Inspect baseline requirements, stage-gate evidence and approved change requests.

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 Waterfall for a tightly approved migration problem. Prioritize: Inspect baseline requirements, stage-gate evidence and approved change requests.

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

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