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DevNet Associate (DEVASC) 200-901 Practice Test 11

Question 100

The initial implementation fails or does not meet the expected behavior. An automation team cannot tell which change removed a firewall rule because scripts are edited in place without recorded versions. Which investigation should be prioritized to diagnose the problem?

  1. Inspect git status and git diff --cached before the commit.
  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 git log, commit hashes and the changed lines for the rule generator.

Explanation

Correct Answer

D:

Inspect git log, commit hashes and the changed lines for the rule generator. These are the relevant initial evidence checks for Git history for configuration rollback. Intended action: Keep reviewed automation source in Git with commits, authorship, and change messages. Expected success condition: A disputed rule deletion can be traced to a specific commit and compared with the prior revision.

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 Git history for configuration rollback problem. Prioritize: Inspect git log, commit hashes and the changed lines for the rule generator.

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 Git history for configuration rollback problem. Prioritize: Inspect git log, commit hashes and the changed lines for the rule generator.

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 Git history for configuration rollback problem. Prioritize: Inspect git log, commit hashes and the changed lines for the rule generator.

Question 101

A Cisco network automation team has this requirement: Two engineers modify the same infrastructure script for unrelated features and repeatedly overwrite each other's uncommitted edits. Which design or implementation action best addresses it?

  1. Stage the reviewed parser path explicitly and confirm the index before committing.
  2. Keep the documented JSON payload and validate its field names and types with a JSON parser.
  3. Use separate Git branches and review changes before merging into the shared main branch.
  4. Add a persistent unit test asserting correct handling of an empty list alongside normal nonempty fixtures.

Explanation

Correct Answer

C:

Use separate Git branches and review changes before merging into the shared main branch. Technical reason: Branches isolate concurrent work until an intentional integration step. Verify by: Both improvements arrive as distinct commits with an auditable merge history. Deployment qualification: A clean Git merge does not prove the combined automation is semantically correct.

Incorrect Answers

A:

Stage the reviewed parser path explicitly and confirm the index before committing. This instead targets the different case Stage only the intended file before commit. The described Branch isolation for competing fixes requirement specifically calls for Use separate Git branches and review changes before merging into the shared main branch.

B:

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 Branch isolation for competing fixes requirement specifically calls for Use separate Git branches and review changes before merging into the shared main branch.

D:

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 Branch isolation for competing fixes requirement specifically calls for Use separate Git branches and review changes before merging into the shared main branch.

Question 102

After deployment, an engineer must prove the proposed solution works. Two engineers modify the same infrastructure script for unrelated features and repeatedly overwrite each other's uncommitted edits. Which observed result is the most direct acceptance evidence?

  1. Both improvements arrive as distinct commits with an auditable merge history.
  2. Concurrent tenant tests use distinct endpoints and tokens without cross-tenant leakage.
  3. The playbook configuration is readable as YAML while the outgoing request passes the service's JSON schema check.
  4. Repeated offline test runs yield identical output regardless of sandbox uptime.

Explanation

Correct Answer

A:

Both improvements arrive as distinct commits with an auditable merge history. Recommended implementation: Use separate Git branches and review changes before merging into the shared main branch. Why the observation matters: Branches isolate concurrent work until an intentional integration step.

Incorrect Answers

B:

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 Branch isolation for competing fixes case. For this case, the decisive observation is: Both improvements arrive as distinct commits with an auditable merge history.

C:

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 Branch isolation for competing fixes case. For this case, the decisive observation is: Both improvements arrive as distinct commits with an auditable merge history.

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 Branch isolation for competing fixes case. For this case, the decisive observation is: Both improvements arrive as distinct commits with an auditable merge history.

Question 103

A developer is explaining the underlying technical behavior. Two engineers modify the same infrastructure script for unrelated features and repeatedly overwrite each other's uncommitted edits. Which principle is most relevant to this case?

  1. Unit tests isolate the component being tested from uncontrollable network dependencies.
  2. Branches isolate concurrent work until an intentional integration step.
  3. Git cannot automatically choose incompatible overlapping edits; human resolution creates a coherent merge.
  4. Nested JSON arrays become Python lists containing dictionary objects.

Explanation

Correct Answer

B:

Branches isolate concurrent work until an intentional integration step. This mechanism explains Branch isolation for competing fixes. Action: Use separate Git branches and review changes before merging into the shared main branch. Expected confirmation: Both improvements arrive as distinct commits with an auditable merge history.

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 Branch isolation for competing fixes case the operative principle is: Branches isolate concurrent work until an intentional integration step.

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 Branch isolation for competing fixes case the operative principle is: Branches isolate concurrent work until an intentional integration step.

D:

Nested JSON arrays become Python lists containing dictionary objects. This relates to Parse nested device lists into Python. In the current Branch isolation for competing fixes case the operative principle is: Branches isolate concurrent work until an intentional integration step.

Question 104

A team does not apply the necessary control or correction. Two engineers modify the same infrastructure script for unrelated features and repeatedly overwrite each other's uncommitted edits. Which resulting failure or risk is most directly relevant?

  1. A monolithic routine propagates local presentation changes into unrelated network code.
  2. Live-only tests confound parser defects with connection outages and API throttling.
  3. Sending YAML text while declaring JSON triggers parsing errors or invalid request handling.
  4. Editing one shared local copy invites lost changes and unpredictable releases.

Explanation

Correct Answer

D:

Editing one shared local copy invites lost changes and unpredictable releases. This is the direct exposure for Branch isolation for competing fixes. Mitigate with: Use separate Git branches and review changes before merging into the shared main branch. Check success by: Both improvements arrive as distinct commits with an auditable merge history.

Incorrect Answers

A:

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

B:

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 Branch isolation for competing fixes requirement, the directly relevant risk is: Editing one shared local copy invites lost changes and unpredictable releases.

C:

Sending YAML text while declaring JSON triggers parsing errors or invalid request handling. This risk occurs in the different YAML config versus JSON API body situation. For the given Branch isolation for competing fixes requirement, the directly relevant risk is: Editing one shared local copy invites lost changes and unpredictable releases.

Question 105

The initial implementation fails or does not meet the expected behavior. Two engineers modify the same infrastructure script for unrelated features and repeatedly overwrite each other's uncommitted edits. Which investigation should be prioritized to diagnose the problem?

  1. Inspect baseline requirements, stage-gate evidence and approved change requests.
  2. Inspect sprint reviews, backlog changes and delivered increments over successive iterations.
  3. Capture outbound Content-Type and body bytes, and compare them against the endpoint example.
  4. Inspect branch tips, pull requests, conflict resolution and resulting history.

Explanation

Correct Answer

D:

Inspect branch tips, pull requests, conflict resolution and resulting history. These are the relevant initial evidence checks for Branch isolation for competing fixes. Intended action: Use separate Git branches and review changes before merging into the shared main branch. Expected success condition: Both improvements arrive as distinct commits with an auditable merge history.

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 Branch isolation for competing fixes problem. Prioritize: Inspect branch tips, pull requests, conflict resolution and resulting history.

B:

Inspect sprint reviews, backlog changes and delivered increments over successive iterations. This investigation primarily applies to Agile iteration for uncertain feature requirements, not the current Branch isolation for competing fixes problem. Prioritize: Inspect branch tips, pull requests, conflict resolution and resulting history.

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 Branch isolation for competing fixes problem. Prioritize: Inspect branch tips, pull requests, conflict resolution and resulting history.

Question 106

A Cisco network automation team has this requirement: 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 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. Stage the reviewed parser path explicitly and confirm the index before committing.
  3. Use an XML parser with explicit namespace mappings to select the required interface elements.
  4. Use separately constructed tenant-scoped client instances rather than one shared mutable singleton.

Explanation

Correct Answer

B:

Stage the reviewed parser path explicitly and confirm the index before committing. Technical reason: Git separates working-tree edits from the staging index and committed snapshot. Verify by: git diff --cached shows the parser change and no credential file in the staged set. Deployment qualification: Previously tracked secrets require rotation and history cleanup, not only unstaging.

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 Stage only the intended file before commit requirement specifically calls for Stage the reviewed parser path explicitly and confirm the index before committing.

C:

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 Stage only the intended file before commit requirement specifically calls for Stage the reviewed parser path explicitly and confirm the index before committing.

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 Stage only the intended file before commit requirement specifically calls for Stage the reviewed parser path explicitly and confirm the index before committing.

Question 107

After deployment, an engineer must prove the proposed solution works. 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 observed result is the most direct acceptance evidence?

  1. The parser obtains Gi1 and integer 1000 from the fixture without searching raw text.
  2. Each sprint demonstrates a working subset and incorporates ranked stakeholder feedback.
  3. Both improvements arrive as distinct commits with an auditable merge history.
  4. git diff --cached shows the parser change and no credential file in the staged set.

Explanation

Correct Answer

D:

git diff --cached shows the parser change and no credential file in the staged set. Recommended implementation: Stage the reviewed parser path explicitly and confirm the index before committing. Why the observation matters: Git separates working-tree edits from the staging index and committed snapshot.

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 Stage only the intended file before commit case. For this case, the decisive observation is: git diff --cached shows the parser change and no credential file in the staged set.

B:

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

C:

Both improvements arrive as distinct commits with an auditable merge history. That observation could confirm Branch isolation for competing fixes, not the current Stage only the intended file before commit case. For this case, the decisive observation is: git diff --cached shows the parser change and no credential file in the staged set.

Question 108

A developer is explaining the underlying technical 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 principle is most relevant to this case?

  1. Git separates working-tree edits from the staging index and committed snapshot.
  2. XML attributes and child elements are separate constructs in the parsed tree.
  3. Waterfall emphasizes phase ordering and upfront specification for stable scopes.
  4. Classes group state with related behavior while modules organize reusable definitions.

Explanation

Correct Answer

A:

Git separates working-tree edits from the staging index and committed snapshot. This mechanism explains Stage only the intended file before commit. Action: Stage the reviewed parser path explicitly and confirm the index before committing. Expected confirmation: git diff --cached shows the parser change and no credential file in the staged set.

Incorrect Answers

B:

XML attributes and child elements are separate constructs in the parsed tree. This relates to Distinguish XML attribute from element text. In the current Stage only the intended file before commit case the operative principle is: Git separates working-tree edits from the staging index and committed snapshot.

C:

Waterfall emphasizes phase ordering and upfront specification for stable scopes. This relates to Waterfall for a tightly approved migration. In the current Stage only the intended file before commit case the operative principle is: Git separates working-tree edits from the staging index and committed snapshot.

D:

Classes group state with related behavior while modules organize reusable definitions. This relates to Separate classes from modules for network clients. In the current Stage only the intended file before commit case the operative principle is: Git separates working-tree edits from the staging index and committed snapshot.

Question 109

A team does not apply the necessary control or correction. 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 resulting failure or risk is most directly relevant?

  1. Fixing one sample without a regression test allows the failure to return unnoticed.
  2. A fixed long specification can lock in an unhelpful interface before operators see a working version.
  3. A broad add can accidentally commit secrets unrelated to the approved change.
  4. Sending YAML text while declaring JSON triggers parsing errors or invalid request handling.

Explanation

Correct Answer

C:

A broad add can accidentally commit secrets unrelated to the approved change. This is the direct exposure for Stage only the intended file before commit. Mitigate with: Stage the reviewed parser path explicitly and confirm the index before committing. Check success by: git diff --cached shows the parser change and no credential file in the staged set.

Incorrect Answers

A:

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 Stage only the intended file before commit requirement, the directly relevant risk is: A broad add can accidentally commit secrets unrelated to the approved change.

B:

A fixed long specification can lock in an unhelpful interface before operators see a working version. This risk occurs in the different Agile iteration for uncertain feature requirements situation. For the given Stage only the intended file before commit requirement, the directly relevant risk is: A broad add can accidentally commit secrets unrelated to the approved change.

D:

Sending YAML text while declaring JSON triggers parsing errors or invalid request handling. This risk occurs in the different YAML config versus JSON API body situation. For the given Stage only the intended file before commit requirement, the directly relevant risk is: A broad add can accidentally commit secrets unrelated to the approved change.

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.

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

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