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The Transmission Control ProtocolInternet Protocol TCPIP is a protocol for sending information across sometimes-unreliable networks with the assurance that it will arrive in uncorrupted form TCPIP allows efficient and reasonably error-free transmission between different systems and is the standard protocol of the Internet and intranets It is usually used throughout the Internet In other words the Internet does not use much-vaunted Open Systems Interconnect OSI seven layers model It instead uses a four-layer model of which the two most important layers are the Internet Protocol and Transmission Control Protocol As we have seen TCPIP is the protocol used throughout the Internet The first character in a packet header shows the version of IP with which that packet complies There are 6 version of IP as shows below - 1IPv1used on ARPANet superseded 2IPv2used on ARPANet superseded 3IPv3used on ARPANet superseded 4IPv4CURRENT VERSION 5IPv5experimental has since been retired 6IPv6proposed replacement for IPv4 IPv6 is a sort of Internet protocol where it is intended to provide Internet layer security It is also a proposed replacement for IPv4 and the firewalls of IPv4 will not become absolute as well as the payload length will not change The are few problems IPv4 is intended to address such as follow - 1Real-time streams of data get broken 2IP spoofing 3No authentication 4No encryption 5The number of computers on the Internet is already greater than the number of unique addresses available for them on the Internet IPv6 is being developed because it had helps to enhance streaming Besides that it also provides for crystal-clear voice-over-IP Ipv6 will ensure that when the network clogs routers wont chop up crucial bits of real-time streams into multiple packets Instead of receiving the first half of the stream and losing the second half - something youve surely experienced when a RealAudio broadcast drops out midsentence - IPv6 gives you the whole stream at one-half quality That sounds like a drawback but if
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