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Glossary of Networking Terms
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... URL (Uniform Resource Locator) URL is an address that uniquely identifies a location on the Internet. . Generally, a URL specifies the connection protocol and a file name. The connection protocol can be telnet, ftp, gopher, etc., and for web pages, http is the usual protocol as in the fictitious URL ...
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... messages one sends. In fact, for all programs that utilize the TCP/IP protocol, the sender IP address and destination IP address are required in order to establish communications and send data. Internet addresses are needed not only for unique enumeration of hosted interfaces, but also for routing p ...
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Distributed firewall

A firewall is a system or group of systems (router, proxy, or gateway) that implements a set of security rules to enforce access control between two networks to protect ""inside"" network from ""outside"" network. It may be a hardware device or a software program running on a secure host computer. In either case, it must have at least two network interfaces, one for the network it is intended to protect, and one for the network it is exposed to. A firewall sits at the junction point or gateway between the two networks, usually a private network and a public network such as the Internet.
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