CCNA网路基础 part1.pptVIP

網路訓練課程 - Part I 網路基礎介紹 網路基礎介紹 - Part I 網路起源及演進 OSI Reference Model Introduction to Ethernet / IEEE 802.3 網路設備功能介紹-集線器(Hub) 網路設備功能介紹-交換器(Switch) 網路設備功能介紹-路由器(Router) 1960s and 1970s: Communications 1970s and 1980s: Networks 1980s and 1990s: Internetworks 1990s: Global Internetworking 2000s: 永大 Metro Area Network Network Basic Concept 組成網路的基本要素 Media (Coax cable, twist pair, fiber, wave …) Protocol Host 網路分類 以含蓋區域分類: LAN, WAN, MAN 以Topology分類: Bus, Star, Ring 以Media分類: wire (UTP, fiber), wireless (IR, RF) 以使用者分類: Internet, Intranet, IP, VPN 以通信方式分類: point-to-point, broadcast, multicast Local-Area Networks and Devices Operate within a limited geographic area Allow multiaccess to high-bandwidth media Control the network privately under local administration Provide full-time connectivity to local services Connect physically adjacent devices Wide-Area Networks and Devices Operate over geography of telecommunication carriers Allow access over serial interfaces operating at lower speeds Control the network subject to regulated public services Provide full-time and part-time connectivity Connect devices separated over wide, even global areas Metro Area Network and Devices MAN is Combination of WAN and LAN Cover Wide Area and Provide High Bandwidth Provide Data, Voice, Video Services in a Net Provide full-time and part-time connectivity Provide Privacy and Public Services Ethernet Access is the Key IP Over Optical Network Network Manager Tasks and Goals Network Manager Tasks and Goals Network Manager Tasks and Goals Network Manager Tasks and Goals OSI Model Overview Basic Layer Terminology Application Layer Selects network application to support user’s application Application Layer (cont.) Internetwork applications can extend beyond the enterprise Presentation Layer Provides code formatting and conversion for applications Session Layer Coordinates applications as they interact on different hosts Transport Layer Overview Segments upper-layer applicat