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Home Cisco® 200-901

Cisco® 200-901 Exam Practice Questions (P. 1)

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Question #1
Which two concepts describe test-driven development? (Choose two.)
  1. A
    User acceptance testers develop the test requirements.
  2. B
    It enables code refactoring.
  3. C
    Tests are created when code is ready for release.
  4. D
    Implementation is driven by incremental testing of release candidates.
  5. E
    Write a test before writing code.

Correct Answer:
BE
chatbot-img GPT-4o - Answer
Test-driven development (TDD) centers on a fundamental approach where you write a test for a specific piece of functionality before implementing that functionality in code. This method ensures the test fails initially since the functionality doesn't exist yet. After coding the necessary functionality, the focus shifts to making the test pass. The process doesn't end there; it also includes refactoring the code afterward to improve efficiency and readability while ensuring it still passes all tests. This dual focus on initial test creation followed by continuous code refinement captures the essence of TDD effectively.

Question #2
Which task is performed because the test-driven development approach is being used?
  1. A
    creating test scenarios based on continuous development
  2. B
    writing code without committing any coding violations
  3. C
    refactoring code that is covered by existing tests
  4. D
    testing existing software before developing new code

Correct Answer:
C
Reference:
https://www.guru99.com/test-driven-development.html

Question #3
What is the first development task in test-driven development?
  1. A
    Write code that implements a desired function.
  2. B
    Write a failing test case for a desired function.
  3. C
    Reverse engineer the code for a desired function.
  4. D
    Write a passing test case for existing code.

Correct Answer:
B
Reference:
https://technologyconversations.com/2013/12/20/test-driven-development-tdd-example-walkthrough/

Question #4
In test-driven development, what are two of the green bar patterns? (Choose two.)
  1. A
    another test
  2. B
    break
  3. C
    triangulate
  4. D
    starter test
  5. E
    fake it

Correct Answer:
CE
Reference:
https://www.cs.uic.edu/~i442/Patterns%20for%20TDD.pdf

Question #5
In the test-driven development model, what is changed after a test fails?
  1. A
    schedule
  2. B
    project requirements
  3. C
    code
  4. D
    test

Correct Answer:
C
Reference:
https://www.guru99.com/test-driven-development.html#:~:text=In%20simple%20terms%2C%20test%20cases,code%20simple%20and%20bug%
2Dfree

Question #6
What is a benefit of test-driven development?
  1. A
    strict adherence to product requirements
  2. B
    faster releases that have minimal features
  3. C
    early customer involvement
  4. D
    increased code quality

Correct Answer:
A
chatbot-img GPT-4o - Answer
Test-driven development (TDD) primarily benefits the coding process by enforcing a discipline where developers write tests before actually writing the feature code. This method ensures that each piece of added functionality is necessary and clearly linked to specified requirements, preventing speculative or excessive coding. By starting from the requirements and working toward fitting just those needs, TDD keeps development tight and focused. Although TDD can contribute to better-designed and higher-quality code, its core strength lies in aligning code strictly with client and project requirements, validating "A" as the correct answer.

Question #7
Which two statements describe the advantages of using a version control system? (Choose two.)
  1. A
    It allows for branching and merging so that different tasks are worked on in isolation before they are merged into a feature or master branch.
  2. B
    It provides tooling to automate application builds and infrastructure provisioning.
  3. C
    It allows multiple engineers to work against the same code and configuration files and manage differences and conflicts.
  4. D
    It provides a system to track User Stories and allocate to backlogs.
  5. E
    It allows developers to write effective unit tests.

Correct Answer:
AC
chatbot-img GPT-4o - Answer
Version control systems are crucial in collaborative environments, allowing multiple developers to work concurrently on the same project without overwriting each other's contributions. This is accomplished through features such as branching and merging. Branching lets developers work in isolation on features without impacting the main project, while merging allows these independent changes to be combined smoothly into one unified codebase, handling any potential conflicts that might arise. This functionality not only safeguards the code from potential losses but also maintains a history of changes, who made them, and the specifics of each change, enhancing overall project management and bug tracking.

Question #8
What are two advantages of version control software? (Choose two.)
  1. A
    It supports tracking and comparison of changes in binary format files.
  2. B
    It allows new team members to access the current code and history.
  3. C
    It supports comparisons between revisions of source code files.
  4. D
    It provides wiki collaboration software for documentation.
  5. E
    It allows old versions of packaged applications to be hosted on the Internet.

Correct Answer:
BC
chatbot-img GPT-4o - Answer
Version control systems play a pivotal role in software development by allowing team members to access the current codebase and its complete revision history. This facilitates onboarding new developers and ensuring everyone is up-to-date. They also empower developers to conduct detailed comparisons between different revisions of source code, simplifying debugging and enhancing understanding of code evolution over time. These capabilities are essential for maintaining consistency and accelerating collaborative development processes.

Question #9
Before which process is code review performed when version control is used?
  1. A
    checkout of code
  2. B
    merge of code
  3. C
    committing code
  4. D
    branching code

Correct Answer:
B
chatbot-img GPT-4o - Answer
When following best practices in version control, the code review process typically occurs before merging code changes. This step ensures that all code contributions are examined and validated by other developers or automated systems to maintain code quality and consistency. Merging happens post-review to integrate changes safely into the main project, minimizing the risk of introducing errors or conflicts into the production codebase.

Question #10
What is an advantage of a version control system?
  1. A
    facilitates resolving conflicts when merging code
  2. B
    ensures that unit tests are written
  3. C
    prevents over-writing code or configuration files
  4. D
    forces the practice of trunk-based development

Correct Answer:
A
chatbot-img GPT-4o - Answer
Absolutely, choosing A is spot on. Version control systems like Git help a bunch when multiple devs are tweaking the same bits of a project. They really shine by handling those inevitable code clashes smoothly. This doesn't just prevent overwriting; it actively manages changes to keep the team in sync. Spotting and resolving conflicts during merges? That's crucial, making everything run smoother and keeping the code clean and functional.

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