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deliver a partial message because the higher layers are not smart enough to figure out the missing pieces. Once it has received all eleven packets, the Transport Layer reassembles the original message and passes it up to the Session Layer, which examines the Session header created by the transmitter and notes that this is to be handed to whatever process cares about logical channel number seven. It then strips off the header and passes the message up to the Presentation Layer. The Presentation Layer reads the Presentation Layer header created at the transmit end of the circuit and notes that this is an ASCII message that has been encrypted using PGP and compressed using BTLZ. It decompresses the message using the same protocol, decrypts the message using the appropriate public key, and, because it is resident in a mainframe, converts the ASCII message to EBCDIC. Stripping off the Presentation Layer header, it hands the message up to the Application Layer. The Application Layer notes that the message is X.400 encoded, and is therefore an e-mail message. As a result, it passes the message to the e-mail application that is resident in the mainframe system. The process just described happens every time you hit the SEND button. Click.
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Of course, OSI is not the only protocol model. In fact, for all its detail, intricacy, and definition, it is rarely used in practice. Instead, it serves as a true model for comparing disparate protocol stacks. In that regard, it is unequalled in its value to data communications. The most commonly deployed protocol stack is that used in the Internet, the so-called TCP/IP stack. Instead of seven layers, TCP/IP comprises four. The bottom layer, called the Network Interface Layer, includes the functions performed by OSI s Physical and Data Link Layers. It includes a wide variety of protocols as shown in Figure 2-38. We describe them here briefly, because we will describe the functions and relationships of these protocols in a later chapter in great detail. The Internet Protocol Layer, or IP, is roughly functionally equivalent to the OSI Model s Network Layer. It performs routing and congestion control functions and, as the diagram illustrates, includes some of the protocols we mentioned earlier: RIP, OSPF, and a variety of address conversion protocols.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Figure 2-38 The TCP/IP protocol suite
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Transmission Control Protocol (TCP) User Datagram Protocol (UDP) PING
RIP, OSPF, ICMP ARP RARP InARP
Internet Protocol (IP)
Network Interface Layer
The Transmission Control Protocol Layer, or TCP, is responsible for message integrity, similar to the service provided by OSI s Transport Layer. It is extremely capable and has the ability to recover from virtually any network failure imaginable to ensure the integrity of the messages it is designed to protect. For situations in which the high degree of protection provided by TCP (and its attendant overhead) is considered to be overkill, a corollary protocol, called User Datagram Protocol (UDP), is also available at this layer. It provides a connectionless network service and is used in situations in which the transported traffic is less critical and in which the overhead inherent in TCP poses a potential problem due to congestion. The uppermost layer in the TCP/IP stack is called the Application Services Layer. This is where the utility of the stack becomes obvious, because this is where the actual applications are found such as HTTP, FTP, Telnet, and the other utilities that make the Internet useful to the user. We will discuss the TCP/IP protocols stack in more detail later in the book, but for now the information provided will suffice. The point of all these protocols is to give a designer the ability to create a network that will transport the customer s voice, data, video, images, or MP3 files with whatever level of service quality the traffic demands. We now know that data communications protocols make it possible to transport all types of traffic with guaranteed service. Let s turn our attention now to the network itself. In the chapters that follow we will discuss the history of the most remarkable technological achievement on earth the telephone network. Later we will discuss the anatomy of a typical data network and the technologies found there.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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