Data communications and networking

Xem 1-20 trên 268 kết quả Data communications and networking
  • As one of the fastest growing technologies in our culture today, data communications and networking presents a unique challenge for instructors. As both the number and types of students are increasing, it is essential to have a textbook that provides coverage of the latest advances, while presenting the material in a way that is accessible to students with little or no background in the field. Using a bottom-up approach,

    pdf0p muathu_102 28-01-2013 41 7   Download

  • Data communications and networking are changing the way we do business and the way we live. Business decisions have to be made ever more quickly, and the decision makers require immediate access to accurate information. Why wait a week for that report from Germany to arrive by mail when it could appear almost instantaneously through computer networks? Businesses today rely on computer networks and internetworks.

    pdf1171p hoangchung_dtvt 10-12-2012 78 29   Download

  • (BQ) Data Communications and Computer Networks: A Business User's Approach will give you the thorough understanding you need of basic features, operations, and limitations of ifferent types of computer networks. This book offers full coverage of wireless technologies, industry convergence, compression techniques, network security, LAN technologies, VoIP, and error detection and correction.

    pdf445p hoangnhat2112 02-03-2015 24 6   Download

  • Data Communications and Networking, 3/e provides a comprehensive and current introduction to networking technologies. The book is accessible to students from all backgrounds and uses hundreds of figures to visually represent concepts. The new edition has been completely updated to reflect the constantly changing world of network technologies. Enhanced coverage of bluetooth, wireless, satellites, as well as four new chapters on security have been added. The third edition has transitioned from using the 7-layer OSI model to the 5-layer Internet Model.

    pdf706p haovovo8592 20-09-2013 58 20   Download

  • This chapter addresses four issues: data communications, networks, the internet, and protocols and standards. First we give a broad definition of data communications. Then we define networks as a highway on which data can travel. The internet is discussed as a good example of an internetwork. Finally, we discuss different types of protocols, the difference between protocols and standards, and the organizations that set those standards.

    ppt18p tangtuy04 12-03-2016 11 1   Download

  • The two dominant networking models are the Open Systems Interconnection (OSI) and the Internet model (TCP/IP).The first is a theoretical framework; the second is the actual model used in today's data communications. In Chapter 2, we first discuss the OSI model to give a general background. We then concentrate on the Internet model, which is the foundation for the rest of the lecture.

    ppt42p tangtuy04 12-03-2016 2 1   Download

  • One of the major functions of the physical layer is to move data in the form of electromagnetic signals across a transmission medium. Whether you are collecting numerical statistics from another computer, sending animated pictures from a design workstation, or causing a bell to ring at a distant control center, you are working with the transmission of data across network connections. Chapter 3 discusses the relationship between data, which are created by a device, and electromagnetic signals, which are transmitted over a medium.

    ppt116p tangtuy04 12-03-2016 6 1   Download

  • A computer network is designed to send information from one point to another. This information needs to be converted to either a digital signal or an analog signal for transmission. In this chapter, we discuss the first choice, conversion to digital signals.

    ppt71p tangtuy04 12-03-2016 9 1   Download

  • Converting digital data to a bandpass analog traditionally called digitalto-analog conversion. Converting a low-pass analog signal to a bandpass analog signal is traditionally called analog-to-analog conversion. In this chapter, we discuss these two types of conversions.

    ppt36p tangtuy04 12-03-2016 7 1   Download

  • Chapter 6 - Bandwidth utilization: Multiplexing and spreading. In this chapter we will show how we can use the available bandwidth efficiently. We discuss two separate, but related topics, multiplexing and spreading.

    ppt58p tangtuy04 12-03-2016 4 1   Download

  • After explaining some ideas about data and signals and how we can use them efficiently, we discuss the characteristics of transmission media, both guided and unguided, in this chapter. Although transmission media operates under the physical layer, they are controlled by the physical layer.

    ppt31p tangtuy04 12-03-2016 8 1   Download

  • Chapter 9 - Using telephone and cable networks for data transmission. This chapter shows how the issues discussed in the previous chapters can be used in actual networks. In this chapter, we first discuss the telephone network as designed to carry voice. We then show how it can be used to carry data. Second, we discuss the cable network as a television network. We then show how it can also be used to carry data.

    ppt37p tangtuy04 12-03-2016 6 1   Download

  • Chapter 10 - Error detection and correction. This chapter discusses error detection and correction. Although the quality of devices and media have been improved during the last decade, we still need to check for errors and correct them in most applications.

    ppt93p tangtuy04 12-03-2016 4 1   Download

  • Chapter 11 is named data link control, which involves flow and error control. It discusses some protocols that are designed to handle the services required from the data link layer in relation to the network layer.

    ppt103p tangtuy04 12-03-2016 6 1   Download

  • Chapter 12 is devoted to access control, the duties of the data link layer that are related to the use of the physical layer. The main contents of this chapter include all of the following: Random access, controlled access, channelization.

    ppt54p tangtuy04 12-03-2016 6 1   Download

  • Chapter 13 introduces you to wired LANs: Ethernet. This chapter introduces wired local area networks. A wired LAN, viewed as a link, is mostly involved in the physical and data link layers. We have devoted the chapter to the discussion of Ethernet and its evolution, a dominant technology today.

    ppt40p tangtuy04 12-03-2016 7 1   Download

  • This chapter introduces wireless local area networks. The wireless LAN is a growing technology in the Internet. We devote one chapter to this topic. The main contents of this chapter include all of the following: IEEE 802.11, bluetooth.

    ppt34p tangtuy04 12-03-2016 7 1   Download

  • LANs do not normally operate in isolation. They are connected to one another or to the Internet. To connect LANs, or segments ofLANs, we use connecting devices. Connecting devices can operate in different layers of the Internet model. In this chapter, we discuss only those that operate in the physical and data link layers.

    ppt30p tangtuy04 12-03-2016 7 1   Download

  • We discussed wireless LANs in chapter 14. Wireless technology is also used in cellular telephony and satellite networks. We discuss the former in this chapter as well as examples of channelization access methods (see Chapter 12). We also briefly discuss satellite networks, a technology that eventually will be linked to cellular telephony to access the Internet directly.

    ppt37p tangtuy04 12-03-2016 6 1   Download

  • In this chapter, we introduce a wide area network (WAN), SONET, that is used as a transport network to carry loads from other WANs. We first discuss SONET as a protocol, and we then show how SONET networks can be constructed from the standards defined in the protocol.

    ppt50p tangtuy04 12-03-2016 13 1   Download


Đồng bộ tài khoản