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從網路的組成元件來談網際網路

從網路的組成元件來談網際網路. 資管系 梁德昭. 今日的 Internet 是如何形成的？. 通訊技術 區域網路( Local Area Network, LAN) 都會網路( Metropolitan Area Network, MAN) 廣域網路( Wide Area Network, WAN) 通訊協定 TCP/IP. Internet 的構成. 簡單的 Internet 模型. 區域網路( LAN).

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從網路的組成元件來談網際網路

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  1. 從網路的組成元件來談網際網路 資管系 梁德昭

  2. 今日的Internet是如何形成的？ • 通訊技術 • 區域網路(Local Area Network, LAN) • 都會網路(Metropolitan Area Network, MAN) • 廣域網路(Wide Area Network, WAN) • 通訊協定 • TCP/IP

  3. Internet的構成

  4. 簡單的Internet模型

  5. 區域網路(LAN) A local area network (LAN) is a data communication system that allows a number of independent devices to communicate directly with each other in a limited geographic area such as a single department, a single building, or a campus. A large organization may need several connected LANs.The most popular LANs are Ethernet and wireless LANs. We briefly review these technologies in this section. 以下將就兩類目前最為流行的區域網路技術略為介紹 Wired LANs: Ethernet Wireless LANs: IEEE 802.11

  6. Ethernet的媒體存取控制方式 CSMA/CD

  7. Ethernet的邏輯連結控制 (Logical Link Control) 邏輯連結控制的訊框格式：

  8. 各類的Ethernet

  9. Fast Ethernets

  10. Gigabit Ethernets

  11. Wireless LANs (IEEE802.11) • AP (Access Point) • 銜接有線區域網路與無線區域網路之設備 • BSS（Basic Service Set） • 一個無線網路AP的涵蓋區域組成 BSS • DS（Distribution System） • 由無線網路橋接器與相連接的區域網路所組成 • ESS（Extended Service Set） • 由所有無線網路橋接器構成的 BSS 與 DS 共同組成 ESS • ESSID • ESS識別字串

  12. 沒有AP也可形成BSS (Ad-hoc)

  13. ESS

  14. 無線網路的訊號與展頻技術

  15. IEEE802.11之媒體存取控制標準

  16. IEEE802.11的媒體存取控制方式 CSMA/CA

  17. IEEE802.11的邏輯連結控制 (Logical Link Control) 邏輯連結控制的訊框格式：

  18. MAN 與 WAN • 基本上採用相類似的技術，唯管轄含括的區域大小有別 • WAN技術之沿革 • X.25 • Frame Relay • Cell Relay (ATM)

  19. Frame Relay

  20. Cell Relay的好處

  21. ATM的架構

  22. ATM的虛擬電路觀念 ATM cell的格式：

  23. OSI模型與通訊協定

  24. Sender, Receiver, Transmitter

  25. 連接裝置 • Repeaters • Hubs • Bridges • Routers

  26. A repeater connects segments of a LAN. It forwards every bit but has no filtering capability. A bridge has a table used in filtering decisions. It does not change the physical (MAC) addresses in a frame. A router is a three-layer (physical, data link, and network) device. It connects independent LANs or WANs to create an internetwork (internet)

  27. TCP/IP • IP 協定的版本 (Network Layer) • IP V4 • IP V5 • IP V6 • Transport Layer 的協定 • UDP • TCP • SCTP

  28. 總結 一個設計周延的通訊協定，套用在OSI 分層負責的理想模型上，成就了今日百花齊放、繽紛旭燦的 INTERNET

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