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DevNet Associate (DEVASC) 200-901 Practice Test 12

Question 110

The initial implementation fails or does not meet the expected behavior. A developer changed a harmless API parser but also has an untracked credentials file in the working tree, then plans to use git add -A. Which investigation should be prioritized to diagnose the problem?

  1. Inspect git status and git diff --cached before the commit.
  2. Inspect git log, commit hashes and the changed lines for the rule generator.
  3. Inspect branch tips, pull requests, conflict resolution and resulting history.
  4. Check parsed types with isinstance and compare raw payload versus loaded object.

Explanation

Correct Answer

A:

Inspect git status and git diff --cached before the commit. These are the relevant initial evidence checks for Stage only the intended file before commit. Intended action: Stage the reviewed parser path explicitly and confirm the index before committing. Expected success condition: git diff --cached shows the parser change and no credential file in the staged set.

Incorrect Answers

B:

Inspect git log, commit hashes and the changed lines for the rule generator. This investigation primarily applies to Git history for configuration rollback, not the current Stage only the intended file before commit problem. Prioritize: Inspect git status and git diff --cached before the commit.

C:

Inspect branch tips, pull requests, conflict resolution and resulting history. This investigation primarily applies to Branch isolation for competing fixes, not the current Stage only the intended file before commit problem. Prioritize: Inspect git status and git diff --cached before the commit.

D:

Check parsed types with isinstance and compare raw payload versus loaded object. This investigation primarily applies to Preserve numeric and boolean data types, not the current Stage only the intended file before commit problem. Prioritize: Inspect git status and git diff --cached before the commit.

Question 111

A Cisco network automation team has this requirement: Two Git branches change the same request header handling; a merge reports conflict markers in the Python source. Which design or implementation action best addresses it?

  1. Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge.
  2. Map the value stream and remove non-value-adding handoffs while retaining mandatory control gates.
  3. Publish a device-state event and let independent registered subscribers handle notifications.
  4. Use a gated sequential plan with traceable signoffs where change control is mandatory.

Explanation

Correct Answer

A:

Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge. Technical reason: Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge. Verify by: The merged function behaves correctly for both use cases and no conflict markers remain. Deployment qualification: Conflict-free syntax is insufficient if both changes make incompatible assumptions.

Incorrect Answers

B:

Map the value stream and remove non-value-adding handoffs while retaining mandatory control gates. This instead targets the different case Lean removal of redundant handoffs. The described Resolve a merge conflict rather than force-push requirement specifically calls for Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge.

C:

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 Resolve a merge conflict rather than force-push requirement specifically calls for Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge.

D:

Use a gated sequential plan with traceable signoffs where change control is mandatory. This instead targets the different case Waterfall for a tightly approved migration. The described Resolve a merge conflict rather than force-push requirement specifically calls for Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge.

Question 112

After deployment, an engineer must prove the proposed solution works. Two Git branches change the same request header handling; a merge reports conflict markers in the Python source. Which observed result is the most direct acceptance evidence?

  1. The new test fails against an empty implementation and passes after the correct selection function is added.
  2. A disputed rule deletion can be traced to a specific commit and compared with the prior revision.
  3. A test response returns router r1 with status up without TypeError or wrong indexing.
  4. The merged function behaves correctly for both use cases and no conflict markers remain.

Explanation

Correct Answer

D:

The merged function behaves correctly for both use cases and no conflict markers remain. Recommended implementation: Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge. Why the observation matters: Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.

Incorrect Answers

A:

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 Resolve a merge conflict rather than force-push case. For this case, the decisive observation is: The merged function behaves correctly for both use cases and no conflict markers remain.

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 Resolve a merge conflict rather than force-push case. For this case, the decisive observation is: The merged function behaves correctly for both use cases and no conflict markers remain.

C:

A test response returns router r1 with status up without TypeError or wrong indexing. That observation could confirm Parse nested device lists into Python, not the current Resolve a merge conflict rather than force-push case. For this case, the decisive observation is: The merged function behaves correctly for both use cases and no conflict markers remain.

Question 113

A developer is explaining the underlying technical behavior. Two Git branches change the same request header handling; a merge reports conflict markers in the Python source. Which principle is most relevant to this case?

  1. Functions encapsulate repeated behavior behind a single documented interface.
  2. Version control preserves an attributable history of source changes.
  3. JSON natively expresses objects and arrays while XML represents data as elements and attributes.
  4. Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.

Explanation

Correct Answer

D:

Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge. This mechanism explains Resolve a merge conflict rather than force-push. Action: Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge. Expected confirmation: The merged function behaves correctly for both use cases and no conflict markers remain.

Incorrect Answers

A:

Functions encapsulate repeated behavior behind a single documented interface. This relates to Extract repeated API retry logic into a function. In the current Resolve a merge conflict rather than force-push case the operative principle is: Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.

B:

Version control preserves an attributable history of source changes. This relates to Git history for configuration rollback. In the current Resolve a merge conflict rather than force-push case the operative principle is: Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.

C:

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 Resolve a merge conflict rather than force-push case the operative principle is: Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.

Question 114

A team does not apply the necessary control or correction. Two Git branches change the same request header handling; a merge reports conflict markers in the Python source. Which resulting failure or risk is most directly relevant?

  1. Shared mutable globals can send one site's authorization header to another controller.
  2. A singleton holding mutable authentication state risks one tenant inheriting another's credentials.
  3. Force-pushing one branch can discard the other fix or damage shared history.
  4. Live-only tests confound parser defects with connection outages and API throttling.

Explanation

Correct Answer

C:

Force-pushing one branch can discard the other fix or damage shared history. This is the direct exposure for Resolve a merge conflict rather than force-push. Mitigate with: Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge. Check success by: The merged function behaves correctly for both use cases and no conflict markers remain.

Incorrect Answers

A:

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 Resolve a merge conflict rather than force-push requirement, the directly relevant risk is: Force-pushing one branch can discard the other fix or damage shared history.

B:

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 Resolve a merge conflict rather than force-push requirement, the directly relevant risk is: Force-pushing one branch can discard the other fix or damage shared history.

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 Resolve a merge conflict rather than force-push requirement, the directly relevant risk is: Force-pushing one branch can discard the other fix or damage shared history.

Question 115

The initial implementation fails or does not meet the expected behavior. Two Git branches change the same request header handling; a merge reports conflict markers in the Python source. Which investigation should be prioritized to diagnose the problem?

  1. Inspect import call sites, versioned helper implementation and retry-unit tests.
  2. Inspect git status, conflicted hunks, resolution diff and unit tests.
  3. Inspect function boundaries, call graph and tests for each responsibility.
  4. Inspect branch tips, pull requests, conflict resolution and resulting history.

Explanation

Correct Answer

B:

Inspect git status, conflicted hunks, resolution diff and unit tests. These are the relevant initial evidence checks for Resolve a merge conflict rather than force-push. Intended action: Manually reconcile the conflicting code, remove markers, run tests and commit the resolved merge. Expected success condition: The merged function behaves correctly for both use cases and no conflict markers remain.

Incorrect Answers

A:

Inspect import call sites, versioned helper implementation and retry-unit tests. This investigation primarily applies to Extract repeated API retry logic into a function, not the current Resolve a merge conflict rather than force-push problem. Prioritize: Inspect git status, conflicted hunks, resolution diff and unit tests.

C:

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

D:

Inspect branch tips, pull requests, conflict resolution and resulting history. This investigation primarily applies to Branch isolation for competing fixes, not the current Resolve a merge conflict rather than force-push problem. Prioritize: Inspect git status, conflicted hunks, resolution diff and unit tests.

Question 116

A Cisco network automation team has this requirement: A pull request claims to update only timeout settings, but reviewers suspect the authentication method was also changed. Which design or implementation action best addresses it?

  1. Use an XML parser with explicit namespace mappings to select the required interface elements.
  2. Use a gated sequential plan with traceable signoffs where change control is mandatory.
  3. Compare the proposed branch against the approved base with git diff to identify all altered lines.
  4. Use separately constructed tenant-scoped client instances rather than one shared mutable singleton.

Explanation

Correct Answer

C:

Compare the proposed branch against the approved base with git diff to identify all altered lines. Technical reason: Git diff computes content differences between revisions or working states. Verify by: The reviewed diff lists both timeout edits and any header or credential changes. Deployment qualification: Binary/generated files may require a different review mechanism than textual diffs.

Incorrect Answers

A:

Use an XML parser with explicit namespace mappings to select the required interface elements. This instead targets the different case XML namespaces in network configuration. The described Use git diff before reviewing an endpoint change requirement specifically calls for Compare the proposed branch against the approved base with git diff to identify all altered lines.

B:

Use a gated sequential plan with traceable signoffs where change control is mandatory. This instead targets the different case Waterfall for a tightly approved migration. The described Use git diff before reviewing an endpoint change requirement specifically calls for Compare the proposed branch against the approved base with git diff to identify all altered lines.

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 Use git diff before reviewing an endpoint change requirement specifically calls for Compare the proposed branch against the approved base with git diff to identify all altered lines.

Question 117

After deployment, an engineer must prove the proposed solution works. A pull request claims to update only timeout settings, but reviewers suspect the authentication method was also changed. Which observed result is the most direct acceptance evidence?

  1. The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.
  2. The reviewed diff lists both timeout edits and any header or credential changes.
  3. Measured lead time decreases without bypassing security review or deployment verification.
  4. Repeated offline test runs yield identical output regardless of sandbox uptime.

Explanation

Correct Answer

B:

The reviewed diff lists both timeout edits and any header or credential changes. Recommended implementation: Compare the proposed branch against the approved base with git diff to identify all altered lines. Why the observation matters: Git diff computes content differences between revisions or working states.

Incorrect Answers

A:

The parser obtains Gi1 and integer 1000 from the fixture without searching raw text. That observation could confirm Distinguish XML attribute from element text, not the current Use git diff before reviewing an endpoint change case. For this case, the decisive observation is: The reviewed diff lists both timeout edits and any header or credential changes.

C:

Measured lead time decreases without bypassing security review or deployment verification. That observation could confirm Lean removal of redundant handoffs, not the current Use git diff before reviewing an endpoint change case. For this case, the decisive observation is: The reviewed diff lists both timeout edits and any header or credential changes.

D:

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 Use git diff before reviewing an endpoint change case. For this case, the decisive observation is: The reviewed diff lists both timeout edits and any header or credential changes.

Question 118

A developer is explaining the underlying technical behavior. A pull request claims to update only timeout settings, but reviewers suspect the authentication method was also changed. Which principle is most relevant to this case?

  1. Git diff computes content differences between revisions or working states.
  2. Instance isolation is preferable when state must vary between tenants.
  3. Waterfall emphasizes phase ordering and upfront specification for stable scopes.
  4. Test-driven development follows red, green, refactor with executable expected behavior.

Explanation

Correct Answer

A:

Git diff computes content differences between revisions or working states. This mechanism explains Use git diff before reviewing an endpoint change. Action: Compare the proposed branch against the approved base with git diff to identify all altered lines. Expected confirmation: The reviewed diff lists both timeout edits and any header or credential changes.

Incorrect Answers

B:

Instance isolation is preferable when state must vary between tenants. This relates to Avoid Singleton for tenant-specific token clients. In the current Use git diff before reviewing an endpoint change case the operative principle is: Git diff computes content differences between revisions or working states.

C:

Waterfall emphasizes phase ordering and upfront specification for stable scopes. This relates to Waterfall for a tightly approved migration. In the current Use git diff before reviewing an endpoint change case the operative principle is: Git diff computes content differences between revisions or working states.

D:

Test-driven development follows red, green, refactor with executable expected behavior. This relates to Write a failing test before implementation. In the current Use git diff before reviewing an endpoint change case the operative principle is: Git diff computes content differences between revisions or working states.

Question 119

A team does not apply the necessary control or correction. A pull request claims to update only timeout settings, but reviewers suspect the authentication method was also changed. Which resulting failure or risk is most directly relevant?

  1. Relying on the author's summary can miss security-sensitive changes hidden in the patch.
  2. Without a predeclared failing case, an implementation can encode the author's assumption instead of the requirement.
  3. Unsafe deserialization can instantiate executable objects from attacker-controlled YAML.
  4. An unnecessary format conversion adds mappings and opportunities to mishandle types.

Explanation

Correct Answer

A:

Relying on the author's summary can miss security-sensitive changes hidden in the patch. This is the direct exposure for Use git diff before reviewing an endpoint change. Mitigate with: Compare the proposed branch against the approved base with git diff to identify all altered lines. Check success by: The reviewed diff lists both timeout edits and any header or credential changes.

Incorrect Answers

B:

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 Use git diff before reviewing an endpoint change requirement, the directly relevant risk is: Relying on the author's summary can miss security-sensitive changes hidden in the patch.

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 Use git diff before reviewing an endpoint change requirement, the directly relevant risk is: Relying on the author's summary can miss security-sensitive changes hidden in the patch.

D:

An unnecessary format conversion adds mappings and opportunities to mishandle types. This risk occurs in the different JSON versus XML for a telemetry consumer situation. For the given Use git diff before reviewing an endpoint change requirement, the directly relevant risk is: Relying on the author's summary can miss security-sensitive changes hidden in the patch.

Question 120

The initial implementation fails or does not meet the expected behavior. A pull request claims to update only timeout settings, but reviewers suspect the authentication method was also changed. Which investigation should be prioritized to diagnose the problem?

  1. Inspect git log, commit hashes and the changed lines for the rule generator.
  2. Inspect test assertions, initial failing run and subsequent focused passing run.
  3. Check parsed types with isinstance and compare raw payload versus loaded object.
  4. Inspect the exact diff range, commit set and tests covering changed behavior.

Explanation

Correct Answer

D:

Inspect the exact diff range, commit set and tests covering changed behavior. These are the relevant initial evidence checks for Use git diff before reviewing an endpoint change. Intended action: Compare the proposed branch against the approved base with git diff to identify all altered lines. Expected success condition: The reviewed diff lists both timeout edits and any header or credential changes.

Incorrect Answers

A:

Inspect git log, commit hashes and the changed lines for the rule generator. This investigation primarily applies to Git history for configuration rollback, not the current Use git diff before reviewing an endpoint change problem. Prioritize: Inspect the exact diff range, commit set and tests covering changed behavior.

B:

Inspect test assertions, initial failing run and subsequent focused passing run. This investigation primarily applies to Write a failing test before implementation, not the current Use git diff before reviewing an endpoint change problem. Prioritize: Inspect the exact diff range, commit set and tests covering changed behavior.

C:

Check parsed types with isinstance and compare raw payload versus loaded object. This investigation primarily applies to Preserve numeric and boolean data types, not the current Use git diff before reviewing an endpoint change problem. Prioritize: Inspect the exact diff range, commit set and tests covering changed behavior.

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

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