In the last 15-20 years there have been a number of different technologies used to both terminate network traffic and transport this traffic from source to destination. These technologies include a number of which are well known including Asynchronous Transfer Mode (ATM), Frame Relay, Ethernet, PPP among others.
All of these technologies had their various advantages but made it complicated to internetwork between any of these technologies. At the same time these technologies were being used, many companies were looking for methods to connect their various offices together and had few good options that were also cost effective.
Some of these solutions included the technologies listed above and others, but most required either configuring VPN’s between various offices or purchasing leased lines (or dedicated paths) between the various offices at a premium.
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