Virtual Private Networking, or VPN, is a technology that lets people access their office's computernetwork over the Internet while at home or traveling. Accessing a network in this way is referred to asremote access. (For comparison, another common form of remote access is dialing in to the officenetwork over a telephone line.) But VPN is useful for more than just remote access. It can also be usedto link two separate offices over a distance. This is sometimes called a "persistent VPN tunnel", or"site-to-site VPN".
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