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Computers communicate with each other across the internet or around an office they require some certain language. This language is called a “protocol.” The most commonly used protocol is the Transmission Control Protocol/Internet Protocol (TCP/IP). The same protocol has to be in common in running for all the computers or workstations in a network to be connected, regardless of the connecting medium, which can be fiber optic cables, copper wires, or some wireless setup. For example, if a computer with that has running the Novell’s Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX) protocol is connected with a Windows Server 2003 server that is running TCP/IP will result in a protocol error that will hinder communication across the network as well as users gaining connection to the server.
TCP/IP is not simply a combination of a pair of protocols. They are usually known as TCP/IP stacks. This stack has as part of it four different layers. These layers are the Network Layer, the Internet Layer, the Transport Layer, and the Application Layer. The Network Layer involves electrons being transported over the medium (fiber-optic cables, copper wires, or wireless setup) and client software and network services. It is a physical path. The Internet Layer routes packets with the help of IP addresses for determining with accuracy the destination network. The Transport Layer controls the data flow in the form of data packets from and to the Application Layer with the help of port number and also confirms delivery of the packets with the help of acknowledgements, packet sequencing for reassembly, and segment encapsulating with the help of a TCP or UDP (User Data-gram Protocol) header. And last, but not least, the Application Layer helps with the operation of protocols and applications like the Telnet and HTTP. Apart from the Network Layer’s hardware, all of the layers are important from the perspective of security testing.
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