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The ubiquitous telephone networks are examples of circuit-switched networks, Consider what happens when one person wants to send information (voice or facsimile) to another over a telephone network. Before the sender can send the information, the network must establish a connection between the sender and the receiver. This is a bona fide connection for which the switches on the path between the sender and receiver maintain connection state for that connection. In the jargon of telephony, this connection is called a circuit When the network establishes the circuit, it also reserves a constant transmission rate in the network's links for the duration of Supra Purple Suede the connection. Since bandwidth Supra Purple Suede has been reserved for this sender-to- receiver connection, the sender can transfer the data to the receiver at the guaranteed constant rate.
Today's Internet is a quintessential packet-switched network. Consider what happens when one host wants to send a packet to another host over Supra Skytop Gold the Internet. As with circuit switching, the packet is transmitted over a series of communication links. But with packet switching, the packet is sent into the network without reserving any bandwidth whatsoever. If one of the links is congested because other packets need to be transmitted over the link at the same time, then our packet will have to wait in a buffer at the sending purple skytops supra side of the transmission link, and suffer a delay. The Internet makes its best effort to deliver packets ins timely manner, but Supra High Tops Shoes it does not make any guarantees. Not all telecommunication networks can be neatly classified as pure circuit-switched networks or pure packet-switched networks. Nevertheless, this fundamental classification into packet- and circuit-switched networks is an excellent starting point in understanding telecommunication network technology.
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