Final answer:
The principal functions of the 4 layers in a generic information system architecture are presentation, application, data, and infrastructure.
Step-by-step explanation:
A generic information system architecture typically consists of four layers: presentation layer, application layer, data layer, and infrastructure layer.
The presentation layer is responsible for displaying information to users and capturing user input. It includes user interfaces, such as web browsers or mobile apps, and focuses on the interaction between the system and users.
The application layer houses the core functionality of the system. It handles data processing, business logic, and application-specific tasks. This layer contains software components like web servers, application servers, and APIs.
The data layer stores and manages the system's data. It includes databases or file servers that hold the information needed by the system. This layer ensures data integrity, security, and efficient access to data.
The infrastructure layer comprises the physical resources needed for the system to operate. It includes hardware, networks, operating systems, and other infrastructure components.
Each layer plays a crucial role in the overall functioning of the information system, ensuring reliable and efficient operation.