第8讲数据链路层(3)

1、刘宏刘宏月印月印2022-6-8College of Information Science and Technology, HAUT3/302022-6-8College of Information Science and Technology, HAUT4/302022-6-8College of Information Science and Technology, HAUT5/302022-6-8College of Information Science and Technology, HAUT6/30以太网以太网集线器集线器光纤光纤光纤调制解调器调制解调器光纤光纤调制解调器调制解

2、调器2022-6-8College of Information Science and Technology, HAUT7/302022-6-8College of Information Science and Technology, HAUT8/30250m750m500m500m500m50m50m50m网段网段1repeater网网段段2网网段段3repeaterrepeaterrepeater2022-6-8College of Information Science and Technology, HAUT9/30学院学院A学院学院C学院学院B主干集线器主干集线器碰撞域碰撞域20

3、22-6-8College of Information Science and Technology, HAUT10/30集集线线器器网卡网卡工作站工作站网卡网卡工作站工作站网卡网卡工作站工作站双绞线双绞线2022-6-8College of Information Science and Technology, HAUT11/302022-6-8College of Information Science and Technology, HAUT12/302022-6-8College of Information Science and Technology, HAUT13/30网段网段

4、 B网段网段 A网桥12站表站表接口管理接口管理 软件软件网桥协议网桥协议 实体实体缓存缓存接口接口 1接口接口 2111222站地址站地址 接口接口网桥网桥接口接口1接口接口22022-6-8College of Information Science and Technology, HAUT14/302022-6-8College of Information Science and Technology, HAUT15/30B2B1碰撞域碰撞域碰撞域碰撞域碰撞域碰撞域ABCDEF2022-6-8College of Information Science and Technology,

5、HAUT16/30一系一系三系三系二系二系10BASE-T至因特网至因特网100Mb/s100Mb/s100Mb/s万维网万维网服务器服务器电子邮件电子邮件 服务器服务器以太网以太网交换机交换机路由器路由器2022-6-8College of Information Science and Technology, HAUT17/302022-6-8College of Information Science and Technology, HAUT18/30地址地址 接口接口地址地址 接口接口B 1B AA DA 1A DA 1F CF 2F CF 2B1ABCDEF1212B22022-6-

6、8College of Information Science and Technology, HAUT19/302022-6-8College of Information Science and Technology, HAUT20/302022-6-8College of Information Science and Technology, HAUT21/30地址地址 接口接口B1ABCDEF1212地址地址 接口接口B 1A 1A 1F 2F 2B22022-6-8College of Information Science and Technology, HAUT22/30局域网局

7、域网2局域网局域网1 AF不停地兜圈子不停地兜圈子A发出的帧发出的帧F1交换机交换机1转发的帧转发的帧F2交换机交换机2转发的帧转发的帧网络资源白白消耗了网络资源白白消耗了交换机交换机1交换机交换机22022-6-8College of Information Science and Technology, HAUT23/302022-6-8College of Information Science and Technology, HAUT24/302022-6-8College of Information Science and Technology, HAUT25/302022-6-8College of Information Science and Technology, HAUT26/302022-6-8College of Information Science and Technology, HAUT27/302022-6-8College of Information Science and Technology, HAUT28/30一系一系三系三系二系二系10BASE-T至因特网至因特网100Mb/s100Mb/s100Mb/s万维网万维网服务器服务器电子邮件电子邮件 服务器服务器以太网以太网交换机交换机路由器路由器2022-6