T level

 

Networks MAC : medium access control PAN: personal area network WAN: wide area network LAN: local area network MAN: metropolitan area network - across a town Network typologies a physical topology is the physical arrangement of nodes/end points/hosts/clients/devices in a network, a logical topology defines how the devices communicate across the physical topology A network wired in star topology can behave logically as a bus network by using a bus protocol and appropriate physical switching (though you probably should not do this) Switch vs hub Switch: faster, more reliable, and more secure data, uses "access tables" to isolate each connected nodes location Hub: connected nodes are not isolated, so all traffic goes to all nodes, slower, less secure and less reliable STAR vs MESH star: all nodes connected to a central node, usually a switch, these are fast, reliable and cheaper, with good security, however have one critical point a failure, meaning if the switch breaks, the ne...