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Internet Protocol Security (IPSec) Virtual Private Networks (VPNs) were originally developed over a decade ago to help businesses avoid the costs of privately-leased WAN lines. IPSec VPNs work by establishing a tunnel over the Internet to connect the internal corporate network to a site outside a corporate firewall or gateway. IPSec needs compatible hardware or software, often from a single vendor, at both endpoint locations. IPSec VPNs remain viable solutions for connecting trusted endpoint devices that are directly managed by IT (such as branch or remote office computers), but not for mobile or personal devices.
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