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Question 390
A team modernizes a legacy codebase with Copilot assistance. A modernized service changes response fields silently. Which recommendation directly resolves this issue?
- Prefer a bounded change with regression tests unless a rewrite is authorized.
- Retain required rollback and history artifacts under change control.
- Compare serialized API responses before and after the change.
- Target the deployed Python version and validate syntax compatibility.
Explanation
Correct Answer
C:Downstream clients may depend on field names and types.
Incorrect Answers
A:Limiting scope lowers migration risk. This addresses a different situation: The model suggests a complete rewrite of a stable module for a small bug.
B:Historical migration files can be operationally important even when unused at runtime. This addresses a different situation: The assistant proposes deleting migration scripts still needed for recovery.
D:Modernization must respect runtime constraints until upgrade approval. This addresses a different situation: A proposed Python upgrade adds syntax unsupported by the production interpreter.
Question 391
An engineer asks Copilot to optimize a slow endpoint. The model suggests caching without considering whether data is personalized. What should the developer do before accepting the proposed result?
- Run reproducible before-and-after tests and report measured results.
- Define cache keys, isolation, and invalidation for the actual data scope.
- Benchmark representative and adverse input sizes.
- Profile request and dependency latency before choosing an optimization.
Explanation
Correct Answer
B:Incorrect cache boundaries can leak user-specific data.
Incorrect Answers
A:Generated performance claims require empirical verification. This addresses a different situation: The assistant claims a fivefold speedup without a benchmark.
C:An optimization must be evaluated against realistic performance requirements. This addresses a different situation: The proposed algorithm reduces allocations but worsens worst-case complexity.
D:Measurement distinguishes CPU, I/O, and external-service delays. This addresses a different situation: The endpoint is slow but no trace identifies its bottleneck.
Question 392
An engineer asks Copilot to optimize a slow endpoint. A generated SQL optimization removes a WHERE filter that enforces tenant boundaries. Which response best addresses the stated risk or requirement?
- Run reproducible before-and-after tests and report measured results.
- Preserve authorization filters while measuring query performance.
- Benchmark representative and adverse input sizes.
- Define cache keys, isolation, and invalidation for the actual data scope.
Explanation
Correct Answer
B:Performance improvements cannot weaken data isolation.
Incorrect Answers
A:Generated performance claims require empirical verification. This addresses a different situation: The assistant claims a fivefold speedup without a benchmark.
C:An optimization must be evaluated against realistic performance requirements. This addresses a different situation: The proposed algorithm reduces allocations but worsens worst-case complexity.
D:Incorrect cache boundaries can leak user-specific data. This addresses a different situation: The model suggests caching without considering whether data is personalized.
Question 393
An engineer asks Copilot to optimize a slow endpoint. The endpoint is slow but no trace identifies its bottleneck. What is the most defensible next step under responsible development practices?
- Run reproducible before-and-after tests and report measured results.
- Define cache keys, isolation, and invalidation for the actual data scope.
- Preserve authorization filters while measuring query performance.
- Profile request and dependency latency before choosing an optimization.
Explanation
Correct Answer
D:Measurement distinguishes CPU, I/O, and external-service delays.
Incorrect Answers
A:Generated performance claims require empirical verification. This addresses a different situation: The assistant claims a fivefold speedup without a benchmark.
B:Incorrect cache boundaries can leak user-specific data. This addresses a different situation: The model suggests caching without considering whether data is personalized.
C:Performance improvements cannot weaken data isolation. This addresses a different situation: A generated SQL optimization removes a WHERE filter that enforces tenant boundaries.
Question 394
An engineer asks Copilot to optimize a slow endpoint. The proposed algorithm reduces allocations but worsens worst-case complexity. Which recommendation directly resolves this issue?
- Benchmark representative and adverse input sizes.
- Define cache keys, isolation, and invalidation for the actual data scope.
- Preserve authorization filters while measuring query performance.
- Profile request and dependency latency before choosing an optimization.
Explanation
Correct Answer
A:An optimization must be evaluated against realistic performance requirements.
Incorrect Answers
B:Incorrect cache boundaries can leak user-specific data. This addresses a different situation: The model suggests caching without considering whether data is personalized.
C:Performance improvements cannot weaken data isolation. This addresses a different situation: A generated SQL optimization removes a WHERE filter that enforces tenant boundaries.
D:Measurement distinguishes CPU, I/O, and external-service delays. This addresses a different situation: The endpoint is slow but no trace identifies its bottleneck.
Question 395
An engineer asks Copilot to optimize a slow endpoint. The assistant claims a fivefold speedup without a benchmark. Which action is the most appropriate response to this situation?
- Profile request and dependency latency before choosing an optimization.
- Run reproducible before-and-after tests and report measured results.
- Benchmark representative and adverse input sizes.
- Preserve authorization filters while measuring query performance.
Explanation
Correct Answer
B:Generated performance claims require empirical verification.
Incorrect Answers
A:Measurement distinguishes CPU, I/O, and external-service delays. This addresses a different situation: The endpoint is slow but no trace identifies its bottleneck.
C:An optimization must be evaluated against realistic performance requirements. This addresses a different situation: The proposed algorithm reduces allocations but worsens worst-case complexity.
D:Performance improvements cannot weaken data isolation. This addresses a different situation: A generated SQL optimization removes a WHERE filter that enforces tenant boundaries.
Question 396
A security engineer asks Copilot to improve an authentication service. The team has these independent requirements: (1) The generated code builds SQL by concatenating a username. (2) A reset flow accepts a token indefinitely. Which TWO actions together satisfy all requirements? Choose TWO.
- Use an appropriate salted password-hashing library and migration plan.
- Use parameterized queries for credential lookups.
- Enforce token expiration and single-use redemption with suitable storage.
- Apply appropriate HttpOnly, Secure, and SameSite cookie settings.
- Avoid unnecessary account-enumeration signals in public responses.
Explanation
Correct Answers
B:SQL binding prevents input from changing query structure.
C:Reset credentials should have short bounded validity.
Incorrect Answers
A:Plaintext storage exposes credentials and lacks secure verification controls. This addresses a different situation: A password-verification routine compares stored plaintext passwords.
D:Cookie controls reduce avoidable exposure of session identifiers. This addresses a different situation: A generated session cookie is accessible to browser scripts without a need.
E:Error detail can reveal whether an account exists. This addresses a different situation: A login form returns different errors for known and unknown users.
Question 397
A security engineer asks Copilot to improve an authentication service. A password-verification routine compares stored plaintext passwords. What is the most defensible next step under responsible development practices?
- Enforce token expiration and single-use redemption with suitable storage.
- Use parameterized queries for credential lookups.
- Use an appropriate salted password-hashing library and migration plan.
- Avoid unnecessary account-enumeration signals in public responses.
Explanation
Correct Answer
C:Plaintext storage exposes credentials and lacks secure verification controls.
Incorrect Answers
A:Reset credentials should have short bounded validity. This addresses a different situation: A reset flow accepts a token indefinitely.
B:SQL binding prevents input from changing query structure. This addresses a different situation: The generated code builds SQL by concatenating a username.
D:Error detail can reveal whether an account exists. This addresses a different situation: A login form returns different errors for known and unknown users.
Question 398
A security engineer asks Copilot to improve an authentication service. A generated session cookie is accessible to browser scripts without a need. Which recommendation directly resolves this issue?
- Use an appropriate salted password-hashing library and migration plan.
- Apply appropriate HttpOnly, Secure, and SameSite cookie settings.
- Use parameterized queries for credential lookups.
- Avoid unnecessary account-enumeration signals in public responses.
Explanation
Correct Answer
B:Cookie controls reduce avoidable exposure of session identifiers.
Incorrect Answers
A:Plaintext storage exposes credentials and lacks secure verification controls. This addresses a different situation: A password-verification routine compares stored plaintext passwords.
C:SQL binding prevents input from changing query structure. This addresses a different situation: The generated code builds SQL by concatenating a username.
D:Error detail can reveal whether an account exists. This addresses a different situation: A login form returns different errors for known and unknown users.
Question 399
A security engineer asks Copilot to improve an authentication service. A reset flow accepts a token indefinitely. Which action is the most appropriate response to this situation?
- Apply appropriate HttpOnly, Secure, and SameSite cookie settings.
- Use an appropriate salted password-hashing library and migration plan.
- Use parameterized queries for credential lookups.
- Enforce token expiration and single-use redemption with suitable storage.
Explanation
Correct Answer
D:Reset credentials should have short bounded validity.
Incorrect Answers
A:Cookie controls reduce avoidable exposure of session identifiers. This addresses a different situation: A generated session cookie is accessible to browser scripts without a need.
B:Plaintext storage exposes credentials and lacks secure verification controls. This addresses a different situation: A password-verification routine compares stored plaintext passwords.
C:SQL binding prevents input from changing query structure. This addresses a different situation: The generated code builds SQL by concatenating a username.
Question 400
A security engineer asks Copilot to improve an authentication service. A login form returns different errors for known and unknown users. What should the developer do before accepting the proposed result?
- Enforce token expiration and single-use redemption with suitable storage.
- Avoid unnecessary account-enumeration signals in public responses.
- Use an appropriate salted password-hashing library and migration plan.
- Apply appropriate HttpOnly, Secure, and SameSite cookie settings.
Explanation
Correct Answer
B:Error detail can reveal whether an account exists.
Incorrect Answers
A:Reset credentials should have short bounded validity. This addresses a different situation: A reset flow accepts a token indefinitely.
C:Plaintext storage exposes credentials and lacks secure verification controls. This addresses a different situation: A password-verification routine compares stored plaintext passwords.
D:Cookie controls reduce avoidable exposure of session identifiers. This addresses a different situation: A generated session cookie is accessible to browser scripts without a need.
GitHub Copilot (GH-300) Practice Tests
