Computer Networks and Internets With CDROM and Companion by Douglas E Comer

By Douglas E Comer

Computing device Networks and Internets is acceptable for all introductory-to-intermediate classes in computing device networking, the web, or net purposes; readers want no heritage in networking, working structures, or complicated arithmetic.   prime networking authority Douglas Comer provides a wide-ranging, self-contained journey of the recommendations, ideas, and applied sciences that permit today’s net to aid purposes starting from internet looking to telephony and multimedia. This 5th variation has been completely reorganized, revised, and up-to-date: it contains wide new insurance of subject matters starting from instant protocols to community functionality, whereas decreasing or casting off assurance of older protocols and applied sciences. Comer starts off through illuminating the functions and amenities provided through today’s net. subsequent, he systematically introduces the underlying community applied sciences and protocols that lead them to attainable: low-level information communications; packet switching, LAN, and WAN applied sciences; and web protocols resembling TCP, IP, UDP, and IPv6. With those innovations and applied sciences demonstrated, he introduces a number of of an important modern concerns confronted via community implementers and executives, together with caliber of carrier, net telephony, multimedia, community defense, and community administration. Comer has conscientiously designed this publication to help either top-down and bottom-up instructing techniques. scholars want no history in working platforms, and no refined math: Comer is predicated all through on figures, drawings, examples, and analogies, no longer mathematical proofs.

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2 Internet growth plotted on a log scale. 2005 2008 Sec. 2 reveals that the Internet has experienced exponential growth for over 25 years. That is, the Internet has been doubling in size every nine to fourteen months. Interestingly, the exponential growth rate has declined slightly since the late 1990s as a significant percentage of the population in developed countries gained access. 4 From Resource Sharing To Communication As it grew, the Internet changed in two significant ways.

5 Networks, Interoperability, And Standards Communication always involves at least two entities, one that sends information and another that receives it. , devices that forward packets). The important point to note is that for communication to be successful, all entities in a network must agree on how information will be represented and communicated. Communication agreements involve many details. For example, when two entities communicate over a wired network, both sides must agree on the voltages to be used, the exact way that electrical signals are used to represent data, procedures used to initiate and conduct communication, and the format of messages.

17 18 Internet Trends Chap. S. Department of Defense, was especially interested in finding ways to share resources. Researchers needed powerful computers, and computers were incredibly expensive. The ARPA budget was insufficient to fund many computers. Thus, ARPA began investigating data networking — instead of buying a computer for each project, ARPA planned to interconnect all computers with a data network and devise software that would allow a researcher to use whichever computer was best suited to perform a given task.

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