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Network = Net + Work

Network = Net + Work. What is flowing ? What different forms flow ? What rules govern flow ? Where does the flow occur ?. Data Network. What is flowing ? Data What different forms flow ? Text, Graphic, Video ... What rules govern flow ? Standard, Protocol ...

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Network = Net + Work

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  1. Network = Net + Work • What is flowing ? • What different forms flow ? • What rules govern flow ? • Where does the flow occur ?

  2. Data Network • What is flowing ? • Data • What different forms flow ? • Text, Graphic, Video ... • What rules govern flow ? • Standard, Protocol ... • Where does the flow occur ? • Wire, Cable, Atmosphere ...

  3. Evolution of Networking (1) Individual Computers

  4. Evolution of Networking (2) • Duplicate equipment and resources • Difficult to communicate • Difficult to provide management

  5. Evolution of Networking (3) LAN: Local Area Network

  6. Evolution of Networking (4) WAN: Wide Area Network

  7. LAN = Local Area Network • 高速、低錯誤率且涵蓋較小地理範圍 (到數千公尺) 的數據網路 • 可連接在同一大樓或地理限制內的工作站、周邊設備、終端機和其他設備等。 • LAN 的標準指定了纜線，以及 OSI 模型之實體和資料鏈結層的傳訊。乙太網路、FDDI、記號環網路都是廣泛被使用的 LAN 技術。 • 全時段連線

  8. LAN Equipment: Repeater Regenerates and Repeats the signal.

  9. LAN Equipment: HUB Multiport Repeater

  10. LAN Equipment: Bridge Filter traffic based on MAC Addresses.

  11. LAN Equipment: Switch Multiport Bridge

  12. LAN Equipment: Router Path determination Packet switching

  13. WAN = Wide Area Network • 服務廣大區域使用者的資料通訊網路，通常使用電信公司所提供的傳輸設備。 • 訊框中繼、SMDS 和 X.25 等都是廣域網路的實例。 • 頻寬較低(與LAN比較) • 全時段或部分時段

  14. WAN Media: ISDN & PSTN Part-time connectivity (Dial-up by modem)

  15. WAN Media: Frame Relay Full-time connectivity

  16. WAN Media: Leased Line Full-time connectivity

  17. WAN Equipment: Modem MODEM = MOdulate and DEModulate Syn Modem, Asyn Modem

  18. WAN Equipment: Comm. Server Remote Access Server

  19. WAN Equipment: WAN Switch Frame Relay switch

  20. WAN Equipment: Router LAN and WAN connectivity

  21. MAN= metropolitan-area network • MAN -大都會區域網路 (metropolitan-area network)。 • 擴展至大都會區域的網路。 • MAN 所擴展的區域會大於 LAN，但小於 WAN。

  22. Digital Bandwidth • How much information can flow from one place to another in a given amount of time.

  23. Comparing Speed & Distance

  24. Analogy for Bandwidth: Pipe

  25. Analogy for Bandwidth • Highway • Radio system Brainstorming

  26. Highway Analogy for Bandwidth

  27. Audio Analogy for Bandwidth

  28. When we say our Lab is capable of 100Mbps, what do we call that speed? Bandwidth Do we get the full 100Mbps? No! What do we call what we actually get? Throughput

  29. <= Bandwidth Throughput • 資訊抵達或經過網路系統中的某一特定點的速率 • The throughput is effected by: • Internetworking devices • Type of data being transferred • Topology • Number of users • User's computer • Server computer • Power and weather-induced outages

  30. Time Calculations

  31. The importance of Bandwidth • Finite • Save money • A key measure of network performace • A key to understanding the Internet • Increases constantly

  32. Maximum Bandwidths and Length Limitations

  33. WAN Services and Bandwidths

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