ISQI CPSA-FL 問題集

質問 1：
In a customer project the architecture shall be based on components. The requirements have not been fully determined yet.
Taking this constraint into account, which three properties of the components developed by you will you pay particular attention to? (Choose three.)
A. strong cohesion
B. open for extension
C. weak coupling
D. meaningful component names
E. small component size
正解：A,B,C
解説: (Topexam メンバーにのみ表示されます)

質問 2：
Which characteristics of a building block are only visible in the whitebox view, and for which characteristics does the blackbox view suffice? (Assign all answers.)

正解：

Explanation:
For a building block, the characteristics visible only in the whitebox view are:
* Code structure of the building block (D)
* Algorithms used in the building block (E)
* Implementation details for the security requirements of the building blocks (G) The blackbox view suffices for:
* Public interfaces of the building block (A)
* Test coverage based on unit tests for sub building blocks contained in the building block (B)
* Test coverage based on integration tests
* Security requirements of the building blocks (F)
In software architecture, the whitebox view reveals the internal workings of a building block, including its code structure, algorithms, and specific implementation details1. This view is essential when the internal structure and behavior of the component need to be understood or modified.
On the other hand, the blackbox view treats the building block as an opaque entity, focusing on its exposed interfaces and observable behaviors without revealing its internal structure2. This view is sufficient for understanding what the building block does from an external perspective, such as its public interfaces and how well it performs its functions as determined by testing.
Here's a breakdown of the characteristics:
* Whitebox View:
* Code Structure (D): This includes the organization of code within the building block, such as classes, interfaces, and other components.
* Algorithms (E): The specific algorithms used within the building block to perform its functions.
* Implementation Details for Security (G): The actual code and strategies used to fulfill the security requirements.
* Blackbox View:
* Public Interfaces (A): The interfaces that are exposed to other building blocks or systems.
* Test Coverage for Sub Building Blocks (B): The extent to which the unit tests cover the sub-components within the building block.
* Test Coverage for Integration Tests : The coverage of tests that verify the interactions between building blocks.
* Security Requirements (F): The security objectives and criteria that the building block must meet.
References:
* arc42 Documentation on Building Block View1.
* Stack Overflow discussion on the difference between black box and white box in component diagrams2.
* Flylib Section on Black-Box and White-Box Component Views3.

質問 3：
How does management and architects work together? Decide which statements are true and which are false.
(Assign all answers.)

正解：

Explanation:
A) TrueB) FalseC) TrueD) True
A) The project plan from management is influenced by architectural decisions.
* True. Architectural decisions often have significant implications on the project plan, including timelines, resource allocation, and technical approaches1.
B) Cost estimates are primarily the responsibility of the architect.
* False. While architects may contribute to cost estimates, especially regarding design-related expenses, it is typically the management's responsibility to oversee and finalize cost estimates for the entire project2.
C) Architects advise project management on the definition of work packages.
* True. Architects play a crucial role in defining work packages, particularly in ensuring that the technical aspects of the project are accurately captured and planned for1.
D) Management and architects cooperate on handling of technical risks.
* True. Both management and architects need to work closely to identify, assess, and manage technical risks throughout the project2.

質問 4：
Concerning external interfaces, Postel's law suggests: "Be conservative in what you do, be liberal in what you accept from others." Assume that Postel's law has been consistently applied in your system. (Assign all answers.)

正解：

Explanation:
A) FalseB) FalseC) FalseD) TrueE) TrueF) False
Postel's law, also known as the robustness principle, is a guideline in software engineering that advises to "be conservative in what you do, be liberal in what you accept from others"1. This principle has implications for system design and interaction with external interfaces:
A) Response time of the system is reduced: This is false. Postel's law does not directly relate to the response time of a system1.
B) Implementation effort increases: This is false. Being liberal in what is accepted can actually simplify implementation because the system is designed to handle a wider range of inputs without failure1.
C) Usability of the system is reduced: This is false. Postel's law aims to increase robustness and interoperability, which can enhance usability by making the system more resilient and accommodating1.
D) Robustness of the system is increased: This is true. By being conservative in outputs and liberal in inputs, the system becomes more robust, handling a variety of inputs without error1.
E) The integrity of the data transferred via interfaces is increased: This is true. Accepting a wide range of inputs and adhering strictly to output specifications helps maintain data integrity across different systems1.
F) Availability of the system is reduced due to potentially bad quality of input data: This is false. Postel's law suggests that the system should be designed to handle poor quality input data gracefully, thus maintaining availability1.
Applying Postel's law helps create systems that are more tolerant of input variations and strict in their outputs, contributing to overall system robustness and reliability1.