Network Services

Introduction
As part of the development of technology, the need for communication arose that would allow different computers to communicate with each other. The network has become a vital platform, allowing fast communication, sharing and connecting people to jobs, their homes and in their free time. In computer networking, a network service is an application running at the network application layer and above, that provides data storage, manipulation, presentation, communication or other capability. Cliets and servers will often provide a simplified, intuitive user interface to communicate with the network service (for example: a “display before print” interface for the user). In this article we would like to explain what network and what are the basic principles on which it is based. We will use the Internet to illustrate an example.

Computer Networks Servers
Hosts, clients and circuit systems are key components of hardware that makes up the network. The network enables communication through various forms of media by network transmission (cable or wireless). There are also circuit devices that offer special functions such as hubs, switches, routers, bridges, and gateways. In order to communicate, dedicated network software is also required. Customers can access information data and software stored on servers. You can create multiple servers working together over the network with client computers that support business applications. An example of customers being input-output hardware includes the use of a regular PC, that enables the user to access the network, data and server software. Modern client computers are designed to support the dual role of client and server, which means they share access to resources - give and receive information simultaneously. The circuit is a track; physical cables transmit the data between hardware in order for the network to function.

Internet
The Internet is the global system of interconnected computer networks; a network of networks, consisted of different types of networks, linked by different networking technologies that link devices worldwide, such as optic, wireless and cable transmission of data. The Internet carries an extensive range of information resources and services, such as the documents and applications of the World Wide Web, file sharing and electronic mail. This global system is divided into many types of platforms with different levels of security access. These platforms include: public, private, academic, business related, governmental, etc. This provides some form of security to resources that should only be accessed by certain individuals in order to retain secrecy and privacy within an organisation/company. The transmission of data/information to different applications via the internet use a tool known as internet data packets, which can take different routes to reach its destinations. As a result, the internet is quite resilient even in the case of a failure of a particular host because the packets can find an alternative route which maintains the same result.

Internet VS Intranet
The internet is a global system of interconnected computer networks for public use to share general information whereas, Intranet is a private internal computer network that uses Internet Protocol technology that shares information with only authorised users, usually used by businesses for internal communication. It generally made up of a web interface used to deliver notices, announcements, and appropriate internal proprietary information.

Internet service examples
• E-Mail: messages are being transferred using the Simple Mail Transfer Protocol (The client mail submitted by user passes through a mail server, from there to mail transfer agent [another server]. Once the final server accepts the incoming message, it hands it to a mail delivery agent for local delivery, by saving messages in the relevant mailbox).

• File sharing: File sharing is a technology that allows any networked computer to copy files located on other computers (domain owners).

• Instant messaging: Instant Messaging is a technique for a conversation between two people or more, immediate and fast, through a communications network, usually via the Internet. Instant messaging is done through client software, which connects to the main system of instant messaging services.

• Online gaming: is a computer game played by users through a computer network. The game can take place on a local network, the Internet, intranet, or similar technologies. There are different types of games, and all are based on the ability of human users to play against each other through the network to which they are connected (internal or external). This is in contrast to games which are controlled by software such as a computer game. Internet games include a variety of games with different levels of complexity, from browser games based on text and Adobe Flash technology to strategy games that incorporate three-dimensional graphics and virtual worlds that allow multiple players to take part in them simultaneously and over time.

• Printing: This method uses a hardware output, the printing machine, which receives the information directly from the computer in a digital format and prints it on paper. • Video telephony: uses the technologies for the reception and transmission of audio-video signals by users at different locations, in real-time. This is used over the Internet, to enable communication between people around the world.