COMPUTER SCIENCE AND ENGINEERING
SOFTWARE ENGINEERING
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Question
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Detailed explanation-1: -Although the layered architecture pattern does not specify the number and types of layers that must exist in the pattern, most layered architectures consist of four standard layers: presentation, business, persistence, and database (Figure 1-1).
Detailed explanation-2: -The four layers of four-tier architecture are presentation layer (PL), data service layer (DSL), business logic layer (BLL), and data access layer (DAL).
Detailed explanation-3: -4+1 is a view model used for “describing the architecture of software-intensive systems, based on the use of multiple, concurrent views". The views are used to describe the system from the viewpoint of different stakeholders, such as end-users, developers, system engineers, and project managers.
Detailed explanation-4: -Definition. ● The layered architecture style is one of the most common architectural styles. The idea behind Layered Architecture is that modules or components with similar functionalities are organized into horizontal layers. As a result, each layer performs a specific role within the application.