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There are many types of dial-up connection set-ups which are supported by Linux Operating system. The Serial Line Internet Protocol (SLIP) works very well with Linux and operates in the same way as PPP. When it comes to use of Line Internet Protocol which is a different kind of platform for networking, you need to have other network devices which are different from the ones utilized by SLIP and PPP. This is the kind of network protocol that enables you connect two or more Linux computers using parallel ports which are normally used with printers. Computer networking through other network devices like switches and hubs is meant to reduce the possibility hack attacks. When hackers get your computer network, they can pause as the legitimate owners. This is known as identity theft. They can therefore have access to your information and communication channels. The risk posed by hackers makes it necessary for other network devices that are safer to be used. There are many computer connectivity devices that few people know about. The most commonly known networks are Ethernet, LAN and MAN. The most popular connectivity device is Modem. Other network devices include Hubs, routers and switches. One also needs network cables and access points for a computer network to be fully functional. The best example of a WAN is internet which is used to connect computers that are two computers that may be as far as two continents apart. Many typologies for a computer network exist today, some of which have never been put into practical use since there are other network devices that are required apart from the conventional ones. A star typology is the most commonly used computer network since a problem with one computer does not affect other computers in any way. The existence of many computers makes the uses of routers and other network devices a priority for obvious reasons of security and efficiency.