Software Quality Assurance Practice Exam

The business layer, also known as the service layer, is responsible for handling the application's business logic. It serves as the bridge between the user interface and the data access layer, ensuring that the application services meet business requirements.

Transaction processing is a critical functionality of the business layer, as it involves managing and coordinating the operations involved in a single transaction. This includes ensuring that all parts of the transaction are completed successfully or that the system can revert to a stable state if something goes wrong (rollback functionality). Effective transaction processing maintains data integrity and consistency across the application.

In addition to transaction processing, other functionalities associated with the business layer include:

- User authentication, which involves verifying the identity of a user attempting to access the system.

- User authorizing, where roles and permissions are defined to control what authenticated users can do within the application.

- Data validation, which ensures that the data being processed meets the defined criteria and standards before further action.

These functionalities work together to support the overall operation of the application, ensuring proper access control, data integrity, and compliance with business rules.