Bgp(border gateway protocol)
LAN,WAN and MAN.
Packet switched
WAN. LAN is a short range connection, WAN is wide range.
A WAN is any technology used to connect networks at a greater distance. Without a WAN, your home - or in this case, your school - won't have a connection to the Internet.
I am pretty sure that a WAN connection would not be needed for a home network. A WAN is a Wide-Area Network. A WAN would be used to connect to your business computer from home. A LAN is a Local-Area Network. It should be sufficient if the network is simply for sharing files or printers, etc.
Serial
CSU/DSU Modem
wi-fi,celluar wan, and bluetooth
frame relay?
to porvide things easier
WAN communication speed, reliability, and connectivity are more challenging to manage than those of a LAN
Wireless N