Download Computer Networks (4th Edition) by Andrew S. Tanenbaum PDF

By Andrew S. Tanenbaum

Acceptable for classes titled laptop Networking or creation to Networking at either the undergraduate and graduate point in laptop technological know-how, electric Engineering, CIS, MIS, and company Departments. during this hugely expected revision, Tanenbaum takes a dependent method of explaining how networks paintings from the interior out. He begins with an evidence of the actual layer of networking, computing device and transmission platforms; then works his approach as much as community purposes. Tanenbaum's in-depth software assurance contains e mail; the area identify method; the area large net (both shopper- and server-side); and multimedia (including voice over IP, net radio video on call for, video conferencing, and streaming media. every 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 net, and instant networks, together with instant LANs, broadband instant and Bluetooth. This new Fourth version includes a new bankruptcy committed solely to community safeguard.

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The Presentation Layer Unlike lower layers, which are mostly concerned with moving bits around, the presentation layer is concerned with the syntax and semantics of the information transmitted. , banking records), to be defined and exchanged. The Application Layer The application layer contains a variety of protocols that are commonly needed by users. One widely-used application protocol is HTTP (HyperText Transfer Protocol), which is the basis for the World Wide Web. When a browser wants a Web page, it sends the name of the page it wants to the server using HTTP.

They were astounded when there was no network expert and no grand design. They had to figure out what to do on their own. Nevertheless, somehow an experimental network went on the air in December 1969 with four nodes: at UCLA, UCSB, SRI, and the University of Utah. These four were chosen because all had a large number of ARPA contracts, and all had different and completely incompatible host computers (just to make it more fun). The network grew quickly as more IMPs were delivered and installed; it soon spanned the United States.

A host could send messages of up to 8063 bits to its IMP, which would then break these up into packets of at most 1008 bits and forward them independently toward the destination. Each packet was received in its entirety before being forwarded, so the subnet was the first electronic store-and-forward packet-switching network. ARPA then put out a tender for building the subnet. Twelve companies bid for it. After evaluating all the proposals, ARPA selected BBN, a consulting firm in Cambridge, Massachusetts, and in December 1968, awarded it a contract to build the subnet and write the subnet software.

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