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4th Edition: Chapter 1
4th Edition: Chapter 1

...  Internet standards  RFC: Request for comments  IETF: Internet Engineering Task Force Introduction ...
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... Voice over Internet Protocol (VoIP) applications are making their way into safety-critical environments. If voice data has to be transmitted in such environments, the connection must not fail and the network has to recover quickly. Additionally, the use of specialized systems that are tailored to a ...
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... Cisco routers are said to have a market share of over 90% in the Internet. They are used by most large companies and agencies all over the world, and are considered as the most important building blocks of the Internet. Cisco routers provide physical connectivity between networks by virtue of their ...
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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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