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Client-Server Model

A client-server model refers to an application structure that is distributed. It segregates tasks or workloads between those that provide a resource or service (servers) and those that request the service (clients).<br>

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Client-Server Model

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  1. Client-Server Model

  2. Table of Contents • Categories of Client-Server Approach • 7One-Tier Architecture • Two-Tier Architecture • Three-Tier Architecture • N-Tier Architecture • Benefits of Client-Server Model • Client • Server • Client-Server Network • Client-Server Model • Client-Server Model (Continued)

  3. CLIENT • Clients are also referred to as service requesters. Clients are those computer hardware or server software which request resources and services that are provided by a server. Client computing can be classified as thick, thin or hybrid.  • Thick Client- A thick client is one that offers rich functionality and carries out most of the data processing. It depends very less on the server. • Thin Client- A thin client refers to a lightweight computer which depends on the resources of the host computer to a great extent. • Hybrid Client- A hybrid client is a combination of a thick client’s and a thin client’s characteristics. It depends on the server for storing persistent data. It is capable of local processing.

  4. Server YELLOW • Any device or computer program that lets other devices or programs have functionality is known as a server. A server refers to any computerized process that is used or called upon by a client for the purpose of sharing resources and distributing work. There are application servers, database servers, computing servers, web servers etc. • Web servers are the servers that are provided by web hosting companies for hosting web pages. It is these web hosting companies that make websites accessible over the Internet and are often termed as the ““Best Website Hosting Company”, the “Best Windows Hosting Company” or the “Top Cloud Hosting Company” when they excel in their services.

  5. Client-Server Network • A client-server network refers to the medium that enables clients to access resources and services from a central computer by using either the LAN (Local Area Network) or the WAN (Wide Area Network). • Network traffic is categorized as either client-to-server or as server-to-server. Client-server network’s major advantage is that it ensures a centralized management of applications as well as data. • The most popular network services are, e-mail, file sharing and the World Wide Web. In the context of the World Wide Web, there are numerous websites that can be accessed over the Internet. These websites are kept up and running by web hosting companies. These companies that are also known as web hosts, provide the server space, services and the technologies that are needed to make a website accessible. Terms such as the “Best Website Hosting Company”, the “Best Windows Hosting Company” and the “Top Cloud Hosting Company” refer to the top-notch website hosting service providers.

  6. Client-Server Model The client-server model refers to a distributed application framework. It divides tasks between servers and clients that are present either in the same system or interact over a computer network or the Internet. In it the client sends a request to another program for the purpose of accessing a service that is made available by a server. One or more programs are run by the server that are meant for sharing resources with, as well as distributing work, among clients.

  7. Client-Server Model (Continued) The client server model functions by communicating in a messaging pattern that involves request–response. It must follow a common communications protocol in which the language, rules and the dialog patterns that are to be used are formally defined. The TCP/IP protocol suite is followed by the client-server communication. The connection is maintained by the TCP protocol till the time the client and the server are through with the message exchange. A scheduling system organizes and prioritizes client requests. The client-server model lets any computer utilize other hosts’ shared resources and aids in expanding its capabilities.

  8. Categories of Client-Server Approach There are four categories of client-server approach. These are, one-tier architecture, two-tier architecture, three-tier architecture and N-tier architecture. These will be discussed in more detail in the following slides.

  9. 1-800-123 -8156 Whoa! That’s a big number, aren’t you proud?

  10. One-Tier Architecture One-tier architecture involves a program being run on a single computer, wherein there is no requirement regarding access to the network. In it, network protocols are not managed by user requests. Hence, the code remains simple and there isn’t any extra traffic on the network.

  11. Two-Tier Architecture A two-tier architecture involves the server, the client, as well as the protocol by which the two tiers are linked. In it the code related to the Graphical User Interface exists on the client host and the server host has the domain logic.

  12. Three-Tier Architecture A three-tier architecture involves a presentation tier (User Interface layer), the application tier (service layer which performs detailed processing) and the data tier that has a database server for storing information.

  13. N-Tier Architecture An application is divided into logical layers by an N-tier architecture. This separates responsibilities as well as manages dependencies and physical tiers that are run on separate machines. Moreover, it improves scalability and adds latency. N-Tier architecture can be either closed-layer or open-layer. In closed-layer, each layer can communicate only with the next layer that is below it. In open-layer, a layer can communicate with any of the layers that are below it.

  14. Benefits of Client-Server Model The client-server model has many advantages which are mentioned below. Facilitates protection of data and manages easily user authorization and authentication. Addition of resources (servers, network segments and computers) to a client-server network without encountering any major interruption. Ensures access to data in an efficient manner without the clients and the server being in close proximity. Facilitates easy upgrades, relocation of the nodes and replacements. The data that gets transferred is platform-agnostic.

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