All of the WAN technologies can be categorized in dedicated and switched variants. The preferred and optimum technology of WAN construction is the mode of switching of packets. However, frequently switching mode appears inaccessible in a specific widespread geographical region. Nevertheless, under the circumstances it is most likely then an area with widely distributed services by telephone networks or networks with dedicated phone lines that is already established and supporting the WAN structure. Therefore a combination of both technologies switch and dedicated allows to build a corporate network by combining both ways WAN is operating.
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