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網路概論 Class 1-Protocols, Architecture and Transmission Media

網路概論 Class 1-Protocols, Architecture and Transmission Media. 授課老師 楊人順 2001/09/26. Network Classifications Network Devices Network Software Network Topologies Network Protocols Switching Techniques Group Discussion. Presentation Outlines. Switch (Inter-media) Network

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網路概論 Class 1-Protocols, Architecture and Transmission Media

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  1. 網路概論Class 1-Protocols, Architecture and Transmission Media 授課老師 楊人順 2001/09/26

  2. Network Classifications Network Devices Network Software Network Topologies Network Protocols Switching Techniques Group Discussion Presentation Outlines -2-

  3. Switch (Inter-media) Network Circuit-Switched Network Message-Switched Network Packet-Switched Network Virtual Packet-Switched Network Broadcast (non-inter-media) Network LAN: Ethernet 10BASE5 and 10BASE2 Packet Radio Network Satellite Network Network Classification in terms of transmission technology -3-

  4. Local Area Network (LAN) Ethernet, Ether-switch Token Ring, Token Bus ATM LAN, Wireless LAN Metropolitan Area Network DQDB Wide Area Network ISDN, B-ISDN, Internet Network classification in term of scale -4-

  5. Repeater : electronically repeating (信號放大/電氣層隔離) (layer 1) Bridge : only to connect LANs with different/some protocol (實際地址登記辨識/資料流隔離)(layer 2) Router : Connect different Network (LAN, MAN, WAN) and routing + protocol transformation (layer 3) Gateway : Connect different Network (WAN-to-WAN) and protocol transformation (layer 3 or layer 4-7) Wireless Devices : wireless Hubs for LAN and Mobile communication systems Network Devices -5-

  6. Telnet FTP Email WWW Teleshopping (SET-Secure Electronic Transactions安全電子交易) 它是一個用來保護在任何網路上付款卡交易的開放式規格。SET規格融合了從RSA資料安全的公開鑰匙(Public Key)編成密碼文件(Cryptography)的使用，以保護任何開放型網路上個人和金融資訊的隱密性。 Network Game Video-on-Demand(隨選視訊) Video-Conference(視訊會議) Point-of-Sale(POS) accounting Network Software -6-

  7. Point-to-point Multipoint Broadcast Switched Network Internet Network Topologies (please referred as page 34 Figure 2.1) -7-

  8. What is a Protocol ? A communication language between one-to-one or among many computers in hardware or software. Why standardization ? (next slide) Functions (pp.35-44) Encapsulation Segmentation and reassembly Connection control (pp.38 Figure 2.3) Ordered delivery Flow control Error control Addressing (pp. 41 Figure 2.4) and addressing modes (pp. 42 Table 2.1) Multiplexing Transmission services Network Protocols -8-

  9. Why standardization Standard protocol -9-

  10. Three Layer Protocol Model Application Application Application protocol Transport Transport Transport protocol Network Access Network Access Communications Network Network access protocol Network access protocol A simplified layer model -10-

  11. Discussion : Design: separate layers to handle different function, and collect similar functions into the same layer Maintain: errors are easier to be located, each layer boundaries with its upper and lower layer only Replace: allow changes without affecting other layers software engineering issues Principles Used in Defining the OSI layers (pp. 45 Table 2.2) Why Layering -11-

  12. Developed by International Organization for Standardization. A reference model for current and future protocols Layers Descriptions (three layer model  OSI) Network access  Physical, Data link and Network layers Transport  Transport and Session layers Application  Presentation and Application layers OSI layer on network equipments (next slide) Open System Interconnection (OSI) -12-

  13. OSI Reference layers -13-

  14. Transmission Control Protocol/Internet Protocol (TCP/IP) Application (pp.59 Application protocols by using TCP/IP as platform) Socket Interface connection operations : end-to-end connection maintained, flow/error control and connection resource managements TCP IP Packet operations : addressing/routing, p-t-p link management and network resource managements Network access Subnet : Hardware and Firmware Physical (OSI v.s. TCP/IP : pp.22 Figure 1.11) -14-

  15. OSI v.s. TCP/IP -15-

  16. Protocol Data Units (PDUs) Segment/Reassembly Application data (application PDU) Transport header Transport header Transport SDU Transport SDU Transport PDU Transport PDU Network PDU Network PDU Network SDU Network SDU Network header Network header -16-

  17. Addressing (next slide) Synchronization : Intra-Connection and Inter-Connection synchronization Flow and Error Control (Quality of Service) Other controls : packetization information Why add Header and Tailor -17-

  18. Addressing Concepts -18-

  19. Address Modes -19-

  20. Circuit Switch Message Switch Packet Switch Virtual Packet Switch Switching Techniques -20-

  21. Group Discussion

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