With a focus on the most current technology and a convenient modular format, this best-selling text offers a clear and comprehensive survey of the entire data and computer communications field. Emphasizing both the fundamental principles as well as the critical role of performance in driving protocol and network design, it explores in detail all the critical technical areas in data communications, wide-area networking, local area networking, and protocol design. Featuresa modular format-this structure allows instructors to easily design a course to meet their individual needs. For students, it breaks this massive subject into comprehensible parts.unifying principles-the text repeatedly emphasizes such principles as multiplexing, flow control, and error control, and contrasts their application in specific areas of technology.table of contentspart i: overviewdata communications, data networking, and the internetprotocol architecture, tcp/ip, and internet-based applicationsdata transmissionguided and wireless transmissionsignal encoding techniquesdigital data communication techniquesdata link controlmultiplexingspread spectrumpart ii: wide area networkscircuit switching and packet switchingasynchronous transfer moderouting in switched networkscongestion control in switched data networkscellular wireless networkspart iii: local area networkslocal area network overviewhigh-speed lanswireless lanspart iv: internet and transport protocolsinternetwork protocolsinternetwork operationtransport protocolspart vii: internet applicationsnetwork securityinternet applications - electronic mail and network managementinternet applications - internet directory service and world wide webinternet applications - multimedia - from Amzon