Data Communications and Computer Networks: A Business User's Approach
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Data communications and computer networks are vital in today's business world. Whether your career entails business management, computer programming, system design, or a related area, DATABASE COMMUNICATIONS AND COMPUTER NETWORKS, 7th Edition will give you the thorough understanding you need of basic features, operations, and limitations of different types of computer networks. The Seventh Edition retains many of the elements that made past editions so popular, including readability, coverage of the most current technologies, and a balanced presentation of both technical and practical everyday aspects of data communications. This book offers full coverage of wireless technologies, industry convergence, compression techniques, network security, LAN technologies, VoIP, and error detection and correction.
information, sees that the packet must be placed on the local area network, and inserts the local area network header and trailer information. The packet is placed onto the local area network; and using the address information in the LAN header, it travels to the computer holding the Web server application. As the data packet moves up the layers of the Web server’s computer, the LAN, IP, and TCP headers are removed. The Web server application receives the Get Web Page command, retrieves the
different network layouts involved in this operation. With your new cell phone, you have just taken a snapshot of your best friend. You decide to send this snapshot to the e-mail account of a mutual friend across the country. List all the different network layouts involved in this operation. You are driving in a new city and have just gotten lost. Using your car’s built-in navigational system, you submit a request for driving directions from a nearby intersection to your destination. List all the
buildings, the business must receive the right-of-way from the owner of the in-between property. This right might be a simple permission, but it might also involve payment. As we will see in the following sections, wireless transmissions generally do not have to deal with right-of-way issues. This often provides a strong advantage for wireless media over conducted media. WIRELESS MEDIA The introduction of this chapter lists seven separate types of wireless media. Despite the fact that each type
modems, ISDN, Dijkstra’s algorithm, SDLC, and BISYNC Suggestions for further readings on numerous topics within the book Preface xix This Web site also presents visual demonstrations of many key data communications and networking concepts introduced in this text. A visual demonstration accompanies the following concepts: ■ ■ ■ ■ ■ ■ ■ ■ Chapter One: Introduction to Computer Networks and Data Communications— Layer encapsulation example Chapter Four: Making Connections—RS-232 example of
charges because these would, at some point, exceed the cost of installing its own system. ProNet is a company that offers private terrestrial microwave systems that can transfer private voice, local area network data, video conferencing, and highresolution images between remote sites up to 15 miles apart. Figure 3-22 shows a typical microwave communication setup as would be arranged between the two corporate offices of American Insurance. Figure 3-22 Microwave communication between American