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Part IV: Wide-Area Networks > Chapter 17. Virtual Private Networks - Pg. 565

C HAPTER 17 Virtual Private Networks A company with one main site and ten remote sites could buy ten T1 lines, one each from the central site to each remote office. A more cost-effective solution would be to use Frame Relay. However, especially because the remote sites often need access to the Internet, it is even more cost effective to simply connect each office to the Internet, and send traffic between sites over the Internet, using the Internet as a WAN. Unfortunately, the Internet is not nearly as secure as leased lines and Frame Relay. For example, for an attacker to steal a copy of data frames passing over a leased line, the attacker would have to physically tap into the cable, oftentimes inside a secure building,