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A server is a computer with special capabilities which are conneccted all day long. they provide at least one service.
A network connects two or more computers together. Computers connected by a netwrok can communicate with each other. They need an ISP, an Internet Server Provider, to work appropiately.
Ring Networks are arranged like a ring, and data flows in one direction only, from the file server to the rest of the computers in a ring-like pattern. It's cheap to expand and fast for this,, with lots of users it becomes slow .
Line, or bus Networks, function this way: Data is sent through a line of a cable, which we'll call the central line. Each computer is connected to this central line. They don't use much cabling, but when too many computers are being used, the system becomes slow.
Mediums -Bluetooth - Wifi (wireless internet) -USB -Cellphone network (3, the most used one) -Ethernet (Is of 1 Gbs) - Optical function (It's the fastest one, and also the most expensive one) - Infrared
A Star network is connected starlike to a central computer. They're used when large numbers of workstations need to be connected to a central computer, which is the mainframe. It's quick, if one computer fails, the rest of the computers are unaffected by this.
Network
Physical security, which protects the hardware. It needs to have serial numbers, and marking all the hardware, computers rooms should have alarms and doors and windows locked up when they're not in use, it should be fire protected, computers shouldn't be visible from the outside, this includes having blinds and turning the computers off at night.
The advantages of using networks is that devices and software can be used by many computers, as they're shared. Some of the network's terminals are cheaper than stang-along PC's. This communication is fast and cheap. The disadvantages are that Cabling installment may be expensive, if the server fails, then all the network will fail,
Data security, which prevents data loss. For doing this, some software should be password protected, some files can be made to be read-only, this means they can't modify them, some others can be hidden. Backing sotrage should be used regulariy, and kept safe. Archiving, or moving a file for a long storage, should also be done regularly.
Access security prevents unauthorised people from entering the network. For this, all users should have a username and passwords, which they should change frequently. Users should have access rights, for example, only a certain staff part should use word processors, only another part should have network controls, etc.
Network protection
Network types
