WAN requires the same technology as LAN.
WAN usually costs more. Especially, there are recurring monthly costs, since you rent the services of an ISP. Note, however, that a LAN and a WAN serve different purposes; you can't simply replace a WAN with a LAN.
From the user's point of view, accessing a LAN or WAN is the same. If packets need to be forwarded from a LAN via a WAN connection that is taken care of automatically by the router.
WAN. LAN is a short range connection, WAN is wide range.
internal ip is ur lan ip external ip is ip of wan that is provided by isp
absolutely wan. lan is used for a office or a building complex
LAN users get access to internet or can communicate with others LAN connected to WAN.
An LAN card is a must if you wish to connect to a LAN but it is not required for WAN
Extranet is wan
Usually nothing happens when the speed between a home client and the ISP is changed if the speed is increased. This is because the modem you are using and/or the router you have at home is limited to a usual maximum of around 10 megabits per second on the WAN (ISP) connection. Internally the LAN home network is running much faster but the speed outside the house to the ISP is slower.
With a router or firewall or bridge. LAN is Local Area Network (inside a building) WAN is Wide Area Network (building to building, but inside the same organization).
if the LAN is connected to another LAN over a wide distance using point to point links then it becomes part of the WAN (but it doesn't become a WAN by itself).