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.
LAN is internal. IE, your computer, router, modem. WAN is external, such as your computer, a server on the internet, a corporate database. Not to be confused with WLAN, which is wireless LAN
WAN. LAN is a short range connection, WAN is wide range.
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
WAN requires the same technology as LAN.
Extranet is wan
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.
It all depends on perspective. If you look at it as a IP network, the difference is routers used in WAN. If you take in account DNS and other Internet services, the difference is more dramatic.
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).
why the lan high speed than wan