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

By Douglas E Comer

Laptop Networks and Internets is suitable for all introductory-to-intermediate classes in laptop networking, the web, or web purposes; readers desire no historical past in networking, working structures, or complicated arithmetic.   top networking authority Douglas Comer provides a wide-ranging, self-contained travel of the innovations, ideas, and applied sciences that let today’s net to aid purposes starting from net searching to telephony and multimedia. This 5th variation has been completely reorganized, revised, and up to date: it contains broad new assurance of themes starting from instant protocols to community functionality, whereas lowering or casting off insurance of older protocols and applied sciences. Comer starts by means of illuminating the functions and amenities provided through today’s net. subsequent, he systematically introduces the underlying community applied sciences and protocols that cause them to attainable: low-level information communications; packet switching, LAN, and WAN applied sciences; and web protocols corresponding to TCP, IP, UDP, and IPv6. With those thoughts and applied sciences validated, he introduces numerous of an important modern matters confronted by means of community implementers and bosses, together with caliber of carrier, net telephony, multimedia, community safety, and community administration. Comer has rigorously designed this e-book to help either top-down and bottom-up educating techniques. scholars desire no historical past 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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4 Public And Private Parts Of The Internet Although it functions as a single communication system, the Internet consists of parts that are owned and operated by individuals or organizations. To help clarify ownership and purpose, the networking industry uses the terms public network and private network. 1 Public Network A public network is run as a service that is available to subscribers. Any individual or corporation who pays the subscription fee can use the network. A company that offers communication service is known as a service provider.

12 Summary The large set of technologies, products, and interconnection schemes make networking a complex subject. There are five key aspects: network applications and network programming, data communications, packet switching and networking technologies, internetworking with TCP/IP, and topics that apply across layers, such as security and network management. Because multiple entities are involved in communication, they must agree on details, including electrical characteristics such as voltage as well as the format and meaning of all messages.

24 Internet Trends Chap. 2 Although the underlying Internet technology has remained virtually unchanged, new applications continue to emerge that provide enhanced experiences for Internet users. Businesses use high-end teleconferencing systems to reduce travel costs. Sensor networks, maps, and navigation systems enable environmental monitoring, security, and easier travel. Social networking applications encourage new social groups and organizations. 2 Why was sharing of computational resources important in the 1960s?

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