A wide area network(WAN) consists of two or more interconnected connect local area networks (LANs). Usually a third party—a telephone company or an ISP—is involved in providing a connectivity solution to the organization that needs to set up a WAN. A WAN can be set up using a dial-up telephone line for low bandwidth requirements, or it may be set up using a high-bandwidth dedicated line. It is also possible to tunnel the WAN connection through the Internet. The following sections describe various technologies used for WAN connectivity.
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