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ppt
ppt

... • Set of filters and associated actions that are used on a packet by packet basis • Filters specify fields, masks and values to match against packet contents, input and output interface • Actions are typically forward or discard • Such systems have difficulty with things like fragments and a variety ...
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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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