What Is A Network A network is a group of computers interconnected with communication lines which allows users to share information and resources
Stand Alone A stand alone device is a device that does not need the help of any other machine to work. An example is a Fax machine
LAN LAN (Local Area Network) is a network that connects computers in a limited area E.g. school or house
Advantages and Disadvantages of LAN (http://computer-networks.blurtit.com/q372184.html) ADVANTAGES Devices can be shared in small areas. Computers don’t have to have their own hard disk Users can communicate and transfer data very easily Files can be loaded on one computer and then sent to all other computers Disadvantages Special security measures have to be installed Difficult to set up and maintain All users are effected if there is virus in one computer Cannot be set up in buildings
Cabled LAN A LAN network with cables instead of wireless LAN network
Wireless LAN Wireless LAN is a network that is interconnects computers without any wires
LAN Topologies Different networks that use LAN networks Bus Star Ring
Advantages of Line Topology (http://www.klbict.co.uk/gcse/theory/5_3/5_3_4_topologies.htm) It is the cheapest and the most simple to announce Well suited as a temporary network with few computers
Advantages and Disadvantages of Star Topology (http://www.klbict.co.uk/gcse/theory/5_3/5_3_4_topologies.htm) Advantages The most reliable topology Adding more computers will not affect the network Can easily be upgraded from a hub to a switch Easy to install Disadvantages Uses the most wires which make it very expensive Extra hardware further increase the cost Whole network affected if central computer fails If the switch or server fails the network fails
WAN WAN (Wide Area Network) is a network in which covers a broad area E.G. a region, country, city
Connection Using WAN A WAN connection helps computers connect between large distances. International Companies use this Network to have a track recode of their finances Etc. if a company has a WAN network connection they can send and receive files from other countries and even other continents this helps the company keep track of things they want to
Client Networks A client uses an application made by a server. The server is often another computer which is accessed by a network.
Server Networks A server is a network program designed to run programs for “Clients”
Client server network This is a computing model that divides the work given by clients amongst servers
Peer to Peer network Each computer in the network acts as a client or server to another computer.