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In the early 1990s, there were only limited options to extend the availability of the enterprise's network beyond the boundaries of the corporate central site, which comprised mainly extremely costly and inflexible private networks and leased lines. As the Internet grew, however, it spawned the concept of VPNs, as an alternative. Most of these solutions leveraged the free/public long-haul IP transport service and the proven IPSec protocol to provide a more flexible, cost-effective solution for secure access. IPSec VPNs effectively addressed the requirements for fixed, site-to-site network connectivity. However, for mobile users, they were often too costly, while for business partners or customers, they were impossible to deploy, as they required software to be installed and configured on each endpoint device and provided only full network-layer access, unnecessarily exposing all the enterprise's resources.