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WANs cover more than one geographical area. This is ideal for a company that has offices in different cities around the country or even the world. Each office can connect to the other sites in the WAN via a router. Connectivity from router to router is a circuit leased from a telephone or communications company, such as AT&T to name one. The larger the circuit a company needs to transmit data, the more it costs to lease. The company also needs to pay close attention to the performance of its WAN connection because that cost can directly impact its ability to do business. It is impor
tant to keep an eye on the amount of traffic that is going over each circuit to ensure that you have sufficient throughput. Throughput refers to the amount of data transferred in a specified timeframe.