William Stallings Data and Computer …

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data and Computer Communications InterNetwork Operation Internetwork Operation Historically IP nets gave best-effort datagram delivery to all services Now want variety of QoS in IP networks Explore some new network services / functionsMulticasting Sending packet to addresses referring to group of hosts on one or more networks Multimedia (transmission to multiple users) Teleconferencing (forming a multicast group) Database (all copies are updated) Distributed computing (sending results to all) Real time workgroups (files exchange between active group) Have design issues in addressing / routingLAN Multicast LAN multicast is easy Send to IEEE 802 multicast MAC address Since broadcast all stations will see packet Those in multicast group will accept it Only single copy of packet is needed But much harder in internetworkMulticasting in Internetworks Broadcast packet to each network server does not know members of the MC group Send multiple unicast packets each net with members in multicast

Data and Computer Communications InterNetwork Operation . Internetwork Operation ...

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