Server is a computer or a device that manages network resources such as file, printer, user group as well as network traffic on the network. During the server selection two parameter are very important to consider that is server specification and processor specification. There are also some more specification to be consider are memory, storage, connectivity, operating system support specifications. On multiprocessing operating systems on which a single computer can execute several programs, in this case server can only manage resources instead of performing other task. Server must perform complex tasks. Some example of different sever types included on many large networks are listed below.

• Application Servers: A server does not download any file from the network it send only result to the client or we can say it is a type of mid-ware. For example, you might search the employ data base for all employees of the same pay scale instead of the entire database is downloaded to your system. Application server allows a client on the network to access and use extra computing power. Application server is mainly used for the security

• Message Servers: Message server includes Chat servers. groupware and IRC server that enable a large number of users to exchange information in an environment. That enables users to collaborate. regardless of location. via the Internet real-time discussion capabilities. Message servers allow a wide variety of communication methods that are much complex than a simple file server can handle. Data can take in the form of graphics. digitized video. or audio. text and binary.

• FTP Servers: FTP server is specially meant for file management where server is responsible for security. management and sharing of files. For establishing secured connection with users and receiving and delivering files. FTP server uses FTP protocol.


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• Mail Servers: Mail server handles the messaging between the Almost as ubiquitous and crucial as Web servers, mail servers move and store mail over corporate networks (via LANs and WANs) and across the Internet.

• Proxy Servers: Proxy servers is sit between the server and the client. When any request is coming, client pass that request to the server then server process that request and send back to the client. Proxy server improves the performance. filter request and share connections in between the client and server.

• Web Servers: Web server provides the access to the internet using hyper text markup language. A Web server get request from the web browser and send back and associated HTML document.

• File Server: File servers helps user to exchange data. read data. write data as well as manage share file and data contained by these shared files or we can say that it control and manage overall user access .

• Print Server: Print server control and manage printer resources over the network and it also offer Fax services. The print server allows multiple users to access printer resources and fax services simultaneously. All this is managed by the sprint and fax queues (a special storage area printing and faxing jobs are stored).

• Database Server: Database server manage the data base using SOL database management system. Client request is sent in the form of SOL queries to the server then data base server access the stored data to process the client query and sent result back to he client.