LAN
local area network – a small network usually within a building or home (workstation(PC, Mac etc.), servers, NIC, switch)
WAN
wide area network – a collection of multiple LANs; the internet for example (LAN’s joined by media(cable wireless etc.) (routers)
SAN
storage area network – same size as a LAN, it enable shared access to a hard drive (servers, switch, NIC)
PAN
personal area network – like a wireless LAN with a radius of around 10 metres, common uses are mobile phone and a Bluetooth headset
MAN
metropolitan area network – a network that covers a certain area, city wide (LAN’s joined by media(cable wireless etc.) (routers)
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