| Internetwork | An internetwork is that part of a company's computer network that interconnects office locations, remote users, and often customers, vendors, or other business partners. It is comprised of hardware components, like firewalls and VPN devices, and third-party networks, like the Internet or Frame Relay, leased from Network Service Providers (NSPs).
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| IPSEC | Internet Protocol Security. IPSEC is a VPN standard providing encrypted IP communications between two endpoints. It tends to be interoperable and vendor neutral. IPSEC has a large number of options and configurations that tend to make it more difficult to configure and manage.
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| ISP | Internet Service Providers facilitate the connection of their customers' networks to the public internet. ISPs are a special and very common case of NSP.
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