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Virtual private networks that use internet protocol security used to be seen as a nightmare. But next-generation IPsec VPNs are changing all that. Over the past 40 years or so, the way IT has been delivered to end users has changed dramatically. In the 1960s and 1970s, the mainframe dominated and computing resources were generally centralised. By the 1990s, the client-server computing model came into use, providing a convenient way of interconnecting applications distributed across different locations. Now, with the internet ubiquitous, people are all used to a highly distributed computing environment, with information obtained on demand via a wide array of computing devices, many of which are mobile.
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