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【正文】 C E B D F Dual Bus A G B E D F C H Snowflake Mesh Dual Bus CGU NDSL LAN12 Network Topologies A E B D C F J G I H K O L N M 橋接器 橋接器 橋接器 Bridged Ring Networks C A B F D E G H ... Hub, Switch or Concentrator Wireless LAN ? CGU NDSL LAN13 Open System Interconnection (OSI) Model ? Physical Layer. Responsible for transmission of bit streams across a particular physical transmission medium. Retransmission is not supported. ? Encoding/Decoding ? Scrambling/Descrambling ? Data Link Layer. Responsible for providing reliable data transmission from one node to another. Provides errorfree transmission of frames. ? Network Layer. Concerned with routing data from one work node to another. Provides routing path selection. ? Establishing/Maintaining/Terminating work connection ? Transport Layer. Responsible for providing data transfer between two end users at an agreed on level of quality. ? Establishing/Maintaining/Terminating transport layer connection CGU NDSL LAN14 Open System Interconnection (OSI) Model ? Session Layer. Providing services used to anize and synchronize the dialog that takes place between users and to manage the data exchange. ? Presentation Layer. Responsible for the presentation of information to the work users. ? Character code translation/ Data conversion ? Data pression/expansion ? Encryption/Decryption ? Application Layer. Provides services to application processes or users. ? File Transfer Protocol (FTP) ? Remote Login (Tel) ? Transaction Server ? Network Management ? WWW Server/VoD Server CGU NDSL LAN15 Open System Interconnection (OSI) Model Seven Layers 應(yīng)用層 (Application Layer) 表達(dá)層 (Presentation Layer) 會(huì)議層 (Session Layer) 傳輸層 (Transport Layer) 網(wǎng)路層 (Network Layer) 鏈結(jié)層 (Data Link Layer) 實(shí)體層 (Physical Layer) CGU NDSL LAN16 Layering Protocols 應(yīng)用層 表達(dá)層 會(huì)議層 傳輸層 網(wǎng)路層 鏈結(jié)層 實(shí)體層 應(yīng)用層 表達(dá)層 會(huì)議層 傳輸層 網(wǎng)路層 鏈結(jié)層 實(shí)體層 應(yīng)用軟體 X 應(yīng)用軟體 Y 系統(tǒng) A 系統(tǒng) B 鏈結(jié)層通訊協(xié)定 傳輸媒介 網(wǎng)路層通訊協(xié)定 傳輸層通訊協(xié)定 會(huì)議層通訊協(xié)定 表達(dá)層通訊協(xié)定 應(yīng)用層通訊協(xié)定 實(shí)體層通訊協(xié)定 CGU NDSL LA
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