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For this section we introduce WAN and Dial-Up Technology which may be touched on for the CISSP exam. One of the key functions of WAN technology is circuit switching. We explore this process in depth and look at how it impacts data transmission and the various technologies are used for carrying data. We quickly discuss Dial-Up, ISDN and other transmission technology, when that may be used, and what security issues they may present, and how these technologies have changed.