哈工大计算机网络chapter5b课件.ppt

Summary of MAC protocols;LAN technologies;LAN Addresses and ARP;LAN Addresses and ARP;LAN Address (more);Recall earlier routing discussion;ARP: Address Resolution Protocol;ARP protocol;Routing to another LAN;A creates IP packet with source A, destination B A uses ARP to get R’s physical layer address for 111.111.111.110 A creates Ethernet frame with Rs physical address as dest, Ethernet frame contains A-to-B IP datagram A’s data link layer sends Ethernet frame R’s data link layer receives Ethernet frame R removes IP datagram from Ethernet frame, sees its destined to B R uses ARP to get B’s physical layer address R creates frame containing A-to-B IP datagram sends to B;Ethernet;Ethernet Frame Structure;Ethernet Frame Structure (more);Ethernet: uses CSMA/CD;Ethernet’s CSMA/CD (more);Ethernet Technologies: 10Base2;10BaseT and 100BaseT;10BaseT and 100BaseT (more);Gbit Ethernet;Token Passing: IEEE802.5 standard;Token Passing: IEEE802.5 standard;Interconnecting LANs;Hubs;Hubs (more);Hub limitations;Bridges;Bridges (more);Bridges: frame filtering, forwarding;Backbone Bridge;Interconnection Without Backbone;Bridge Filtering;Bridge Filtering;Bridge Learning: example;Bridge Learning: example;Bridges Spanning Tree;Bridges vs. Routers;Routers vs. Bridges;Routers vs. Bridges