A Professional's Guide to Data Communication in a TCP/IP by E. Bryan Carne

By E. Bryan Carne

A reference advisor to the codes, protocols, networks, indications and gear that give the opportunity to speak utilizing TCP/IP.

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Extra info for A Professional's Guide to Data Communication in a TCP/IP World (Artech House Telecommunications Library)

Example text

TLFeBOOK . TLFeBOOK CHAPTER 3 Local Area Networks Local area networks (LANs) interconnect data processing devices that serve communities of users. Operating within the network interface layer, they receive IP datagrams from the Internet layer and return them to it. Originally restricted to a limited geographical area, their reach has been extended to metropolitan areas by the availability of optical fibers. 5). Two styles of local area network are in use. One is known as Ethernet and the other as Token Ring.

1 OSI Model As the name implies, the OSI model is designed to guide the development of open systems so that they can communicate with each other. Open systems are defined by the parameters of the interfaces between their functional blocks. Ideally, equipment from one vendor that implements a function will work with equipment from another vendor that implements the next function. To do this, the model does not define the equipment, only the states that must exist at their interfaces. It is the designers’ problem to create equipment that satisfies these requirements.

In ascending the protocol stack of the receiving system, the reverse procedure occurs; it is known as decapsulation, and the user data are said to be decapsulated. 3 Open Systems Interconnection Model 33 and trailer) added or subtracted in the layer is known as a protocol data unit (PDU). 2 shows their development. 2 Layer Tasks What do the protocols resident in the layers of these stacks do? Divided into those performed when sending, and those performed when receiving, the major tasks are listed in the following sections.

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