This document discusses different types of client server models. It describes logical layers including the presentation layer, application layer, and data layer. It then defines five common client/server models: distributed presentation, remote presentation, distributed logic, remote data, and distributed data. Each model divides responsibilities between the client and server differently. For example, remote presentation puts the presentation manager on the client and the application and data layers on the server.

1. Types of Client Server Models

2. Agenda
 Introduction
 Logical Layers
 Presentation layer
 Application layer
 Data layer
 Client / Server Models
 Distributed presentation
 Remote presentation
 Distributed logic
 Remote data
 Distributed data

3. Introduction
 The Client-Server model is the most prevalent
model for distributed computing protocols.
 It is the basis of all distributed computing
paradigms at a higher level of abstraction.
 It is service-oriented, and employs a request-
response protocol.

4. Introduction
 Client
 A client is an individual user's computer or a user
application that does a certain amount of
processing on its own. It also sends and receives
requests to and from one or more servers for other
processing and/or data.
 Server
 A server consists of one or more computers that
receive and process requests from one or more
client machines. A server is typically designed with
some redundancy in power, network, computing
and file storage.

5. The Client / Server Model
 A server process, running on a server
host, provides access to a service.
 A client process, running on a client
host, accesses the service via the server
process.
 The interaction of the process proceeds
according to a protocol.
 An application based on the client-server
model is a client-server application.

6. Logical Layers
 In general, application software can be
divided into 3 logical layers:
 Presentation layer
 Application layer
 Data layer

7. Presentation Layer
 Presentation layer is responsible for
displaying the information and interacting with
the user .
 It must make the information available in a
suitable form to the user and must respond
appropriately to input from the user.

8. Application Layer
 Application layer processes
commands, makes logical decisions, performs
calculations, and coordinates the application
 It also moves and processes data between
the presentation layer and data layer

9. Data Layer
 Data layer refers to the management of
underlying databases
 It is responsible for storing and retrieving the
data according to the requirements of the
application layer.

10. Client Server Models
 Distributed presentation
 Remote presentation
 Distributed logic
 Remote data
 Distributed data

11. Distributed Presentation
 Only presentation management function
shared between client and server everything
else remains on the server
 Dummy terminals
 GUI placed in front of existing character
based interface, E.g. Windows 3.1.

12. Presentation Application Layer Data Layer
Layer
Client Side Server Side

13. Remote presentation
 Presentation manager entirely on client
 Application layer, data layer and data
manager on server
 Web applications where clients are Web
browsers, Unix through Putty

14. Presentation Application Layer Data Layer
Layer
Client Side Server Side

15. Distributed Logic
 Application is split into presentation layer and
data layer component
 All presentation management activities on
client
 All data management activities on the server

16. Presentation Application Layer Data Layer
Layer
Client Side Server Side

17. Remote Data
 Database manager resides on server
 Presentation management and data logic reside
on client
 Typical of client/server DBMSs
(DB2, Oracle, Informix, etc.)

18. Presentation Application Layer Data Layer
Layer
Client Side Server
Side

19. Distributed Data
 Portions of the database reside on client
 Portions of the database reside on server
 DBMS manages communication involved
 Limited implementation of full-fledged DDBMS
functionality

20. Presentation Application Layer Data Layer
Layer
Client Side Server
Side

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