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從網路的組成元件來談網際網路

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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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Presentation Transcript
internet
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
slide5
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

ethernet logical link control
Ethernet的邏輯連結控制 (Logical Link Control)

邏輯連結控制的訊框格式:

wireless lans ieee802 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
ieee802 11 logical link control
IEEE802.11的邏輯連結控制 (Logical Link Control)

邏輯連結控制的訊框格式:

man wan
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)
slide22
ATM的虛擬電路觀念

ATM cell的格式:

slide25
連接裝置
  • Repeaters
  • Hubs
  • Bridges
  • Routers
slide26

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)

tcp ip
TCP/IP
  • IP 協定的版本 (Network Layer)
    • IP V4
    • IP V5
    • IP V6
  • Transport Layer 的協定
    • UDP
    • TCP
    • SCTP
slide28
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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