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The core of the network consists of powerful routers that direct packets of data from an incoming edge to an outgoing edge, and servers (often housed in large data centers) that serve up content requested by clients such as personal computers and mobile devices. The elements in the core network are connected by high-speed optical fiber. Wireless can be viewed as hanging off the edge of the Internet. Wide-area cellular networks may have worldwide coverage, but each base station is typically connected by a high-speed link to the wired Internet.

—from Introduction to Communication Systems, a book by Upamanyu Madhow

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