VPNs are increasingly becoming an everyday part of life on the Internet. Many people use them to gain access to many of the systems in their offices, such as e-mail and intranets. This trend is certain to become more popular as many companies are finding it cheaper for their employees to work from home, relieving them of the need to lease additional office space.
Site-to-site VPNs will also continue to be deployed as companies, both small and large find it increasingly necessary to share access to their business systems. One notable area is in the realm of IP telephony, where VPNs enable all remote offices to use a single IP switchboard at the center of a VPN hub and spoke network. Intra-office communication is therefore encrypted and the use of a single switchboard saves costs.
Knowledge of VPNs is now indispensable for systems administrators.