CTFL-v4 Testing Throughout the SDLC — 10 Questions

Question 1

In an Agile project, a tester discovers a requirement ambiguity during the sprint planning phase. Which action aligns best with the 'Testing throughout the SDLC' principle?

Accepted Answer

Discuss the requirement with the Product Owner or stakeholder immediately to clarify the intent.. Early testing involves evaluating work products before code is written. By identifying ambiguities during planning, the tester prevents defects from being introduced into the design and implementation phases. This proactive approach saves significant costs compared to finding defects during execution. It emphasizes that testing is not just an execution phase but a continuous process integrated into every stage of the software development lifecycle.

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Document the ambiguity in the defect tracking tool and wait for the developer to fix it.

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Wait until the unit testing phase to verify how the code interprets the ambiguous requirement.

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Proceed with writing test cases based on the tester's own assumption of the requirement.

Question 2

Which TWO of the following statements correctly describe the relationship between testing and the software development lifecycle?

Accepted Answer

Testing should begin as early as possible in the SDLC.. Testing must be integrated early into the SDLC to identify defects as close to their origin as possible, which significantly reduces the cost of fixing them. Regardless of the SDLC model (Waterfall, Agile, or DevOps), the fundamental principles of testing remain the same: early detection, validation against requirements, and continuous quality improvement throughout the entire lifecycle of the software application.

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Testing only occurs after the development phase is finished.

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Testing is an independent phase that is separate from development.

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Testing activities are identical regardless of the SDLC model used.

Question 3

Refer to the exhibit. During the system testing phase, a tester notices the authentication service frequently fails under high load. Based on the provided policy configuration, what is the most appropriate testing action to take next?

Accepted Answer

Conduct a performance test focused on the auth service interaction.. The tester must analyze the interaction between the configuration settings and the system behavior. With a high retry limit and a relatively short timeout, the system might be overloading itself by repeatedly attempting to connect to the authentication service. This scenario highlights why system testing must evaluate how environmental configurations impact system stability, especially when external dependencies like OAuth2 services are involved in the process.

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Immediately request a code change to the authentication module.

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Increase the timeout value to 600ms and retry the test.

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Report a critical defect for the OAuth2 protocol implementation.

Question 4

Which THREE of the following activities are primary objectives of testing within the SDLC?

Accepted Answer

Preventing defects by reviewing requirements and designs.. The primary objectives of testing are to provide confidence in the quality of the software, find defects before release, and ensure that the product meets the specified requirements. These activities, when performed throughout the SDLC, help stakeholders make informed decisions about product readiness, minimize the risk of production failures, and ensure that the delivered system aligns with the intended business and technical goals.

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Verifying that all software features work perfectly.

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Guaranteeing that there are no bugs remaining in the code.

Question 5

Which testing level is primarily concerned with verifying the interaction between different modules or components to ensure they work together correctly?

Accepted Answer

System testing.. Component integration testing focuses on the interfaces and interactions between modules. This is essential because, even if individual components function correctly in isolation, they may fail when combined due to incompatible data formats, logic errors in calling sequences, or misunderstandings of shared interface specifications. Early integration testing helps isolate these issues before they become deeply embedded in the system's architecture.

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Component testing.

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Acceptance testing.

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Maintenance testing.

Question 6

Which THREE of the following are key benefits of static testing?

Accepted Answer

Detection of defects before any code is executed.. Static testing is highly effective at identifying defects early, which is essential for minimizing project costs. By reviewing documents, code, and models without execution, teams find ambiguities and errors that are otherwise hidden. This process also improves communication between stakeholders and developers, ensuring that the software's design is robust and that the final implementation will align with expectations and quality standards.

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Verification of performance under high user load.

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Elimination of the need for dynamic testing entirely.

Question 7

Refer to the exhibit. A tester reviews this configuration file during the static testing of a test environment setup. What is the primary risk of this configuration in a formal testing phase?

Accepted Answer

The disabled strict mode may allow invalid data to be processed, masking bugs.. Testing requires stable and representative environments. The 'strict_mode: false' setting allows suboptimal code paths or weak error handling to pass, which should fail in production. Finding this via static testing prevents 'false negatives' where the system appears stable in testing due to permissive settings. Ensuring the test environment configuration mirrors production requirements is a critical aspect of early SDLC validation and risk management.

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The log level set to debug will cause an overflow error in the production database.

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The exponential retry policy will increase the latency of the system during stress testing.

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The environment tag set to 'dev' indicates that the deployment is insecure by design.

Question 8

Which of the following activities best demonstrates the ISTQB principle of 'Testing provides early feedback'?

Accepted Answer

Reviewing user stories and acceptance criteria during the sprint planning session.. Early feedback is the core of shift-left testing. By performing static testing on documents like requirements or design specifications, testers identify defects before a single line of code is written. This is more efficient and cost-effective than finding defects during dynamic testing, as it prevents the cost of rework and ensures that quality is built into the product from the very start of development.

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Executing automated regression tests at the end of each daily build.

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Conducting a performance test on the integrated system before the final release.

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Reporting defects found during the User Acceptance Testing (UAT) phase.

Question 9

Which TWO of the following statements accurately describe the role of testers in a modern SDLC?

Accepted Answer

Testers contribute by helping to define the acceptance criteria for user stories.. Modern testing emphasizes collaboration and early involvement. Testers serve as quality advocates who help define 'done' and verify that requirements are testable. By participating in reviews and planning, they facilitate a shared understanding of quality across the entire team, which is essential for successfully delivering software in iterative and incremental development environments.

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Testers are solely responsible for all quality activities within the project.

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Testers should focus exclusively on dynamic testing to prove the system works.

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Testers should avoid participating in code reviews to remain unbiased.

Question 10

Which approach is most appropriate for maintaining quality when a project uses a DevOps culture with continuous deployment?

Accepted Answer

Automated regression tests integrated into the pipeline combined with production monitoring.. In continuous deployment, testing must be highly automated and integrated into the CI/CD pipeline. Shifting testing to the left ensures that code quality is verified at every commit, while monitoring provides the final feedback loop. This combination allows for rapid releases without sacrificing quality, which is the primary objective of DevOps and modern continuous testing practices.

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Manual exploratory testing of every build before it is moved to production.

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Performing formal, document-heavy system testing cycles after every code merge.

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Requiring a separate QA phase where developers are not involved in testing.