This document discusses client-server software engineering. It defines client-server architecture as one where the server provides services and the client demands them. There are two main types: two-tier architecture with thin and fat client models, and three-tier architecture. The thin client model puts most functionality on the server, while the fat client model puts more on the client. The three-tier architecture separates presentation, application processing, and data management layers across different machines. An example given is internet banking, with presentation on the client browser, application processing in the middle, and database on the server.

1. Sardar VallabhBhai Patel Institute
Of Technology
 Made By: Rajan Shah  Topic: Client-Server
Software Engineering

2. What Is Client Server Software
Engineering?
 The Client-Server architecture models the application
in such a way that:
1. Server consists of a set of Services and
2. Client demands the services.
 The Client demands for the services provided by the
Server.
 The Client and Server are separate processes.
 Example of services provided: Net Banking, e-
Commerce

4. Client Server Architecture
 Client Server architecture are of two types:
1. Two-Tier Architecture
2. Three-Tier Architecture

5. Two-Tier Architecture
 In Client-Server architecture, one Server might be
connected to more than one Client.
 In this architecture, application executes on two layer:
1. The Client Layer
2. The Server Layer
• The two-tier architecture is of two types:
1. Thin-Client Model
2. Fat-Client Model

6. Thin-Client Model
 In this model the Data Management and Application
Logic is implemented on the Server and the Client is
responsible for running the Presentation software.
 Example: The Compiler makes use of thin-client
model.

7. Advantages and Disadvantages
 Advantages: This model is used in Simple
Applications.
 Disadvantages:
1. There is Heavy-Load on both the Server and the
Network. The Server is responsible for all the
computations which results in Heavy-Network
Traffic between Client and Server.
2. As it executes only Presentation tier on the Client, it
doesn’t use the power of computing devices
available.

8. Fat-Client Model
 In this model, the Server is responsible only for Data
Management.
 The Application and Presentation Software is executed
on the Client Side.
 Example: ATM is connected to the Server. User
operates the ATM’s and the information is processed at
the Client side. The Data Management is handled by
Server.

9. Advantages and Disadvantages
 Advantages:
1. This model makes a proper utilization of power
computing devices by executing the application logic on
clients. Thus, Processing is distributed effectively.
2. Application functionality is spread across many
computers and there by efficiency of overall system
increases.
• Disadvantages:
1. System management is more complex.
2. If Application software has to be changed then this
involves re-installation of software in every client and
thus becomes Costly.

10. Three-Tier Architecture
 In this architecture, the Presentation, Application
Processing and Data Management are logically
separate processes and execute on different processors.

11. Example of Three-Tier Architecture
 Internet Banking is an example of Three-Tier
Architecture.
 The Client browses the web page and requests for
Banking Transactions (The Presentation Layer).
 Then the Application Processes the request and
communicates with the Database Server to verify
request for transaction (The Application Layer).
 The Database Server stores the bank database and
executes queries. The Results of these queries are
returned to Application Server. (Database Management
Layer).

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