数据教程课件chapter9lan1.ppt
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1、1,Chapter Nine,Local Area Networks,痘资爷刚堡堡婪悔忍掣百折灯易仕雍焉陕哑桥绣蓟之港襄弦槛颊铰继卉幼数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,2,Chapter Nine Local Area Networks,LAN Standards,LAN standards for different topologies IEEE Standard 802.3 Ethernet Bus/star topology IEEE Standard 802.5 Token Ring Ring topology IEEE Stand
2、ard 802.11 IEEE Standard 802.4(obsolete)Token Bus,logical token Ring Bus topology,旨褥痉茅纷难纺育鉴演信翻叭梗注呆袭邹父迟黑亏心控淑邪碰诱次嚣姿窗数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,3,Bus Contention Token Ring Star,Chapter Nine Local Area Networks,LAN Topologies,甸符区未毅粱晦省贩嚣拭主川拔抄嘲彦挡址膀肿寿盲亨司沪寅蚤谢蜒曰存数据教程课件chapter 9 lan-1数据教程课件cha
3、pter 9 lan-1,4,Chapter Nine Local Area Networks,Sub-layers at DLL,群猎耐冰个吱搪俩辛详窑俭心苦垦粥脉撞卿兜豪样纂菜谚讨美幼种彤衬赔数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,5,Chapter Nine Local Area Networks,Data Link Layer Standards,Data link layer can be divided into 2 parts Logical Link Control(LLC)Frame formats,error control,f
4、low control Medium Access Control(MAC)Access to medium,contention protocols Standard for LAN at LLC sublayer Standard:IEEE 802.2 IEEE 802.3,802.4,and 802.5 are Medium Access Control(MAC)sub-layer protocols Note:octet(8 bits)is used instead of byte in standards to avoid confusion.,萝踏看唯逊砍昂嫁鞭径耕爵荷擎庐顷牡虏事
5、诽租技赔硼董粤大治活消散茹数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,6,Chapter Nine Local Area Networks,Ethernet:IEEE 802.3,The standard for Ethernet Originated from ALOHA system First Ethernet was developed by Xerox PARC.Ethernet named after ether,which was thought to propagate radio.Bus/star topology Originall
6、y used coax Can be extended by repeaters 1-persistent CSMA/CD protocol,波漫婿沛丛赎剑腋镇理灼蚁捉刘抖豫慷掺吼口险坑的娠胜躬喂密耕淄幂启数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,7,Chapter Nine Local Area Networks,Ethernet:IEEE 802.3,Transceiver Interface between the PC and the cable Detects idle backbone Listens for collisions Put
7、s bits on cable from interface card Passes received bits to interface card,韶遂鞋总迈固师菊渔瓶腹受狐灶欠腰促渗扮饱蹈佣上训碌初粱门咋蓬赴车数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,8,Chapter Nine Local Area Networks,Ethernet:IEEE 802.3,Transceiver cable(AUI cable)5 twisted pair 2 pair for sending data and control 2 pair for recei
8、ving data and control 1 pair for power,补渐郎骗搜符臼卒滇久而棚垂苞反腰哆赌蛾肖戍给逞拔搽艘袖伯托寨蕾瘴数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,9,Chapter Nine Local Area Networks,Ethernet:IEEE 802.3,Network Interface Card(NIC)Receives packets from PC software Formats frames Executes binary exponential backoff algorithm if requir
9、ed Detects incoming frames for itself Performs CRC error checking Has a hardware address,收?发?,舜锈慧嚷涌檀唾拓挂忧木妒娶奢堰圈般刽叹肥防赏梆垃瘟怎桃置甭澈蛀牡数据教程课件chapter 9 lan-1数据教程课件chapter 9 lan-1,10,Chapter Nine Local Area Networks,Ethernet:IEEE 802.3,Preamble 7-octet pattern of alternating 0s and 1s Start of frame delimiter
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