By Andrew S. Tanenbaum
Acceptable for classes titled laptop Networking or creation to Networking at either the undergraduate and graduate point in machine technological know-how, electric Engineering, CIS, MIS, and enterprise Departments. during this hugely expected revision, Tanenbaum takes a established method of explaining how networks paintings from the interior out. He begins with a proof of the actual layer of networking, machine and transmission structures; then works his approach as much as community purposes. Tanenbaum's in-depth software insurance comprises e mail; the area identify approach; the realm huge internet (both buyer- and server-side); and multimedia (including voice over IP, net radio video on call for, video conferencing, and streaming media. each one bankruptcy follows a constant process: Tanenbaum offers key ideas, then illustrates them using real-world instance networks that run in the course of the complete book-the web, and instant networks, together with instant LANs, broadband instant and Bluetooth. This new Fourth variation includes a new bankruptcy dedicated solely to community defense.
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Additional resources for Computer Networks (4th Edition)
4 A Critique of the OSI Model and Protocols Neither the OSI model and its protocols nor the TCP/IP model and its protocols are perfect. Quite a bit of criticism can be, and has been, directed at both of them. In this section and the next one, we will look at some of these criticisms. We will begin with OSI and examine TCP/IP afterward. At the time the second edition of this book was published (1989), it appeared to many experts in the field that the OSI model and its protocols were going to take over the world and push everything else out of their way.
Second, the TCP/IP model is not at all general and is poorly suited to describing any protocol stack other than TCP/IP. Trying to use the TCP/IP model to describe Bluetooth, for example, is completely impossible. Third, the host-to-network layer is not really a layer at all in the normal sense of the term as used in the context of layered protocols. It is an interface (between the network and data link layers). The distinction between an interface and a layer is crucial, and one should not be sloppy about it.
No need for them was perceived, so they were not included. Experience with the OSI model has proven this view correct: they are of little use to most applications. On top of the transport layer is the application layer. It contains all the higher-level protocols. The early ones included virtual terminal (TELNET), file transfer (FTP), and electronic mail (SMTP), as shown in Fig. 1-22. The virtual terminal protocol allows a user on one machine to log onto a distant machine and work there. The file transfer protocol provides a way to move data efficiently from one machine to another.