By Douglas E. Comer
Machine Networks and Internets is acceptable for all introductory-to-intermediate classes in laptop networking, the web, or web purposes; readers want no heritage in networking, working structures, or complicated arithmetic.
Leading networking authority Douglas Comer offers a wide-ranging, self-contained travel of the suggestions, rules, 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 assurance of subject matters starting from instant protocols to community functionality, whereas lowering or casting off insurance of older protocols and applied sciences. Comer starts off by way of illuminating the functions and amenities provided via today’s web. subsequent, he systematically introduces the underlying community applied sciences and protocols that lead them to attainable: low-level facts communications; packet switching, LAN, and WAN applied sciences; and web protocols corresponding to TCP, IP, UDP, and IPv6. With those options and applied sciences validated, he introduces numerous of an important modern matters confronted through community implementers and executives, together with caliber of provider, net telephony, multimedia, community safeguard, and community administration. Comer has conscientiously designed this publication to help either top-down and bottom-up instructing ways. scholars desire no heritage in working platforms, and no refined math: Comer is based all through on figures, drawings, examples, and analogies, now not mathematical proofs.
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Extra resources for Computer Networks and Internets (5th Edition)
8 Headers And Layers We will learn that each layer of protocol software performs computations that insure the messages arrive as expected. To perform such computation, protocol software on the two machines must exchange information. To do so, each layer on the sending computer prepends extra information onto the packet; the corresponding protocol layer on the receiving computer removes and uses the extra information. Additional information added by a protocol is known as a header. 2. Headers are added by protocol software as the data passes down through the layers on the sending computer.
That is, a response passes down through the layers on its way out, and up through the layers on the computer that receives the response. Application Computer 1 Computer 2 Application Transport Transport Internet Internet Net. Interface Net. 2 Illustration of how data passes among protocol layers when computers communicate across a network. Each computer has a set of layered protocols, and data passes through each layer. †The figure shows only one network. When we study Internet architecture, we will learn about intermediate devices called routers and see how layered protocols operate in an Internet.
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. A given protocol can specify low-level details, such as the voltage and signals to be used, or high-level items, such as the format of messages that application programs exchange. Sec. 6 Protocol Suites And Layering Models A set of protocols must be constructed carefully to ensure that the resulting communication system is both complete and efficient.