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There are various technologies involved in establishing WAN (wide area networks) links. It’s a huge topic. Simply put, there are 3 main technologies-
1. Leased Lines - They are dedicated point-to-point connection between two remote locations. Usually the line is 'leased' from a service provider .
2. Circuit Switching- In this, in both ends, the devices are connected to the service providers switching network (such as telephone network) via modems. Think like you are making a 'data call' between two sites. Example- Dial-up connections and ISDN (integrated services digital network). This kind of link is cheaper and is used as backup for leased lines.
3. Packet Switching- This is the hottest thing in the market. Here data is sent as small 'packets'. So it's faster, but slower than leased lines. Also cheaper, as same network is shared between other users. One example of this is MPLS (multi protocol label switching) which is now being widely used by corporate.
Now talking about protocols (the logical part of WAN), there are various protocols for WAN such as PPP (point to point protocol), HDLC (high level data link control), ATM (asynchronous transfer mode) etc.
Metro Ethernet, FibreOptics, VAS, Serial, Gig, leased lines, Frame Relay, ISDN, all are used for WAN Connectivity
Wide area networks are often established with leased telecommunication circuits, Many technologies are available for wide area network links. Examples include circuit switched telephone lines, radio wave transmission, and optic fiber cable. New developments in technologies have successively increased transmission rates.
Wan is a network that cover ralatively large area and connect through different technologies here are some
P2P links
Circuit Switch
Packet Switching etc
Optic Fiber,radio wave transmission, and circuit switched telephone lines.
Frame Relay and ATM and PPPoe