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© The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 Chapter 3 底層技術.

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Presentation on theme: "© The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 Chapter 3 底層技術."— Presentation transcript:

1 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 Chapter 3 底層技術

2 3 - 2 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 目標 本章結束後,您將能夠: 了解不同版本的有線乙太網路 了解無線乙太網路 了解各種類型的點對點廣域網路 了解各種類型的交換式廣域網路,尤其是 ATM 區別訊號增益器、橋接器、路由器、及集線器之間的差異

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4 3 - 4 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 3.1 區域網路 本節所討論的主題包括:  有線區域網路:乙太網路  無線區域網路: IEEE 802.11 區域網路 ( Local Area Network, LAN ) 是指在一個有限的 區間內的資料通訊系統,如一個部門、一棟建築物或是一 個校園的網路。它可以讓一定數量的設備彼此直接通訊, 而大型的機構往往需要數個相連的 LAN 。 最受歡迎的區域網路包括乙太網路 ( Ethernet ) 及無線區 域網路 ( wireless LAN ) 。我們在本節會簡短的介紹這兩種 區域網路。

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20 3 - 20 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 3.2 點對點廣域網路 本節所討論的主題包括:  實體層  資料鏈結層 在 Internet 中,我們遇到的第二種網路類型是點對點廣域 網路 ( point-to-point WAN ) 。 一個點對點廣域網路使用公眾網路,如電話線以連接 2 個 遠端裝置。我們在此將會介紹這些技術的實體層與資料鏈 結層。

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22 3 - 22 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 ADSL 是針對住宅式消費者所設計 的一種非對稱式通訊技術; ADSL 並不適用於商業性消費者。 請注意:

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30 3 - 30 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 3.3 交換式廣域網路 本節所討論的主題包括:  X.25  訊框轉送  ATM Internet 的骨幹網路通常為一交換式廣域網路 ( Switched WAN ) 。 交換式廣域網路為一個涵蓋面積可達一州或一個國家之大 的廣域網路,並且提供很多地點給使用者存取。 在 WAN 內部,由眾多交換器連接點對點網路以構成一個 網狀連結。交換器為一種多埠的連接器,允許數個輸入與 輸出間的連接。

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32 3 - 32 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 資料胞網路使用 Cell 作為資料交換的基本單元。 一個 Cell 為一固定大小的資料區塊。 請注意:

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36 3 - 36 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 注意,一條虛擬連線用 VPI 和 VCI 來定義。 請注意:

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39 3 - 39 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 IP 通訊協定使用 AAL5 子層。 請注意:

40 3 - 40 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 我們將在第 23 章討論 在 ATM 上執行 IP 的相關議題。 請注意:

41 3 - 41 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 3.4 連接裝置 本節所討論的主題包括:  訊號增益器  集線器  橋接器  路由器 LAN 或 WAN 通常不會單獨的運作,它們會與其他網路或與 Internet 連 接在一起。因此,我們使用連接裝置 ( connecting device ) 將各個 LAN 或 WAN 連接在一起。連接裝置可以運作在網路模型中的不同層次。 在此,我們討論 3 種類型的連接裝置: 訊號增益器 ( Repeater ) 或集線器 ( Hub ) 、 橋接器 ( Bridge ) 或第二層交換器 ( Two-layer Switch ) 、 及路由器 ( Router ) 或第三層交換器 ( Three-layer Switch ) 。 訊號增益器或集線器運作在網路模型中的第一層。 橋接器或第二層交換器運作在網路模型中的前兩層。 路由器或第三層交換器運作在網路模型中的前三層。

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44 3 - 44 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 訊號增益器連接一個 LAN 中的不同區段。 請注意:

45 3 - 45 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 訊號增益器轉送每一個位元, 但它並沒有過濾的功能。 請注意:

46 3 - 46 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 訊號增益器是重建訊號,而不是放大訊號。 請注意:

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48 3 - 48 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 橋接器使用一張表格來做封包過濾的決定。 請注意:

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50 3 - 50 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 橋接器無法改變在訊框中的實體 (MAC) 位址。 請注意:

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52 3 - 52 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 路由器是一個三層裝置 ( 實體層、資料鏈結層、與網路層 ) 。 請注意:

53 3 - 53 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 訊號增益器或橋接器連接一條 LAN 的各區段。 路由器連接獨立的 LAN 或 WAN 以形成互連網路。 請注意:

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55 3 - 55 © The McGraw-Hill Companies, Inc., 2006© The McGraw-Hill Companies, Inc., 2007 路由器改變封包內的實體位址。 請注意:


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