LECTURE-1                         Reference:                             Chapter 1                            Introduction...
1-1 DATA COMMUNICATIONSThe term telecommunication means communication at adistance. The word data refers to information pr...
Figure 1.1 Five components of data communication1.3
Figure 1.2 Data flow (simplex, half-duplex, and full-duplex)1.4
1-2 NETWORKSA network is a set of devices (often referred to as nodes)connected by communication links. A node can be acom...
Figure 1.3 Types of connections: point-to-point and multipoint1.6
Figure 1.4 Categories of topology1.7
Figure 1.5 A fully connected mesh topology (five devices)1.8
Figure 1.6 A star topology connecting four stations1.9
Figure 1.7 A bus topology connecting three stations1.10
Figure 1.8 A ring topology connecting six stations1.11
Figure 1.9 A hybrid topology: a star backbone with three bus networks1.12
Figure 1.10 An isolated LAN connecting 12 computers to a hub in a closet1.13
Figure 1.11 WANs: a switched WAN and a point-to-point WAN1.14
Figure 1.12 A heterogeneous network made of four WANs and two LANs1.15
1-3 THE INTERNETThe Internet has revolutionized many aspects of our dailylives. It has affected the way we do business as ...
Figure 1.13 Hierarchical organization of the Internet1.17
1-4 PROTOCOLS AND STANDARDSIn this section, we define two widely used terms: protocolsand standards. First, we define prot...
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  • LECTURE-1 (Data Communication) ~www.fida.com.bd

    1. 1. LECTURE-1 Reference: Chapter 1 Introduction1.1 www.fida.com.bd
    2. 2. 1-1 DATA COMMUNICATIONSThe term telecommunication means communication at adistance. The word data refers to information presentedin whatever form is agreed upon by the parties creatingand using the data. Data communications are theexchange of data between two devices via some form oftransmission medium such as a wire cable. Topics discussed in this section: Components Data Representation Data Flow1.2
    3. 3. Figure 1.1 Five components of data communication1.3
    4. 4. Figure 1.2 Data flow (simplex, half-duplex, and full-duplex)1.4
    5. 5. 1-2 NETWORKSA network is a set of devices (often referred to as nodes)connected by communication links. A node can be acomputer, printer, or any other device capable of sendingand/or receiving data generated by other nodes on thenetwork. Topics discussed in this section: Distributed Processing Network Criteria Physical Structures Network Models Categories of Networks Interconnection of Networks: Internetwork1.5
    6. 6. Figure 1.3 Types of connections: point-to-point and multipoint1.6
    7. 7. Figure 1.4 Categories of topology1.7
    8. 8. Figure 1.5 A fully connected mesh topology (five devices)1.8
    9. 9. Figure 1.6 A star topology connecting four stations1.9
    10. 10. Figure 1.7 A bus topology connecting three stations1.10
    11. 11. Figure 1.8 A ring topology connecting six stations1.11
    12. 12. Figure 1.9 A hybrid topology: a star backbone with three bus networks1.12
    13. 13. Figure 1.10 An isolated LAN connecting 12 computers to a hub in a closet1.13
    14. 14. Figure 1.11 WANs: a switched WAN and a point-to-point WAN1.14
    15. 15. Figure 1.12 A heterogeneous network made of four WANs and two LANs1.15
    16. 16. 1-3 THE INTERNETThe Internet has revolutionized many aspects of our dailylives. It has affected the way we do business as well as theway we spend our leisure time. The Internet is acommunication system that has brought a wealth ofinformation to our fingertips and organized it for our use. Topics discussed in this section: A Brief History The Internet Today (ISPs)1.16
    17. 17. Figure 1.13 Hierarchical organization of the Internet1.17
    18. 18. 1-4 PROTOCOLS AND STANDARDSIn this section, we define two widely used terms: protocolsand standards. First, we define protocol, which issynonymous with rule. Then we discuss standards, whichare agreed-upon rules. Topics discussed in this section: Protocols Standards Standards Organizations Internet Standards1.18

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