Multiple access links and protocols Two types of " links ● Point-to-point PPP for dial-up access e Point-to-point link between Ethernet switch and host o Broadcast (shared wire or medium) e Old-fashioned ethernet ● Upstream hfo e 802.11 wireleSs lan x、&√A blah 旦d shared wire shared wireless satellite cocktail party (e.g. Ethernet)(e.g. Wavelan 5: DatatMultiple Access Links and Protocols Two types of “links”:  Point-to-point  PPP for dial-up access  Point-to-point link between Ethernet switch and host  Broadcast(shared wire or medium)  Old-fashioned Ethernet  Upstream HFC  802.11 wireless LAN 5: DataLink Layer 5-11