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

By Douglas E Comer

Machine Networks and Internets is suitable for all introductory-to-intermediate classes in laptop networking, the web, or net functions; readers want no heritage in networking, working platforms, or complex arithmetic.   best networking authority Douglas Comer provides a wide-ranging, self-contained travel of the options, rules, and applied sciences that allow today’s web to help purposes starting from net looking to telephony and multimedia. This 5th version has been completely reorganized, revised, and up-to-date: it comprises large new assurance of themes starting from instant protocols to community functionality, whereas lowering or disposing of insurance of older protocols and applied sciences. Comer starts via illuminating the functions and amenities provided via 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 akin to TCP, IP, UDP, and IPv6. With those techniques and applied sciences validated, he introduces numerous of crucial modern matters confronted through community implementers and bosses, together with caliber of carrier, web telephony, multimedia, community protection, 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 structures, and no refined math: Comer is predicated all through on figures, drawings, examples, and analogies, no longer mathematical proofs.

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A given protocol specifies low-level details, such as the type of radio transmission used in a wireless network, or describes a high-level mechanism such as the messages that two application programs exchange. We said that a protocol can define a procedure to be followed during an exchange. One of the most important aspects of a protocol concerns situations in which an error or unexpected condition occurs. , a response is expected, but no response arrives). To summarize: A communication protocol specifies the details for one aspect of computer communication, including actions to be taken when errors or unexpected situations arise.

3 Packet Switching And Networking Technologies In the 1960s, a new concept revolutionized data communications: packet switching. Early communication networks had evolved from telegraph and telephone systems that connected a physical pair of wires between two parties to form a communication circuit. Although mechanical connection of wires was being replaced by electronic switches, the underlying paradigm remained the same: form a circuit and then send information across the circuit. Packet switching changed networking in a fundamental way, and provided the basis for the modern Internet: instead of forming a dedicated circuit, packet switching allows multiple senders to transmit data over a shared network.

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. First, communication speeds increased dramatically — a backbone link in the Internet can carry 100,000 times as many bits per second as a backbone link in the original Internet.

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