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04-LL-Ethernet - Ethe t rne dom inant LAN te chnology ap...

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1 Ethernet “dominant” LAN technology: cheap $20 for 100Mbs! first widely used LAN technology Simpler, cheaper than token LANs and ATM Kept up with speed race: 10, 100, 1000 Mbps Uses Manchester encoding or 4B/5B Encoding Exports a connectionless , unreliable service interface Metcalfe’s Ethernet sketch
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2 Ethernet Service Interface Connectionless: No handshaking between sending and receiving adapter. Unreliable: Does not implement any reliable delivery protocol: Receiving adapter doesn’t send acks or nacks to sending adapter stream of datagrams passed to network layer can have gaps. reliability must be implemented by upper layer protocols if desired otherwise, application will see the gaps
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3 Ethernet FrameStructure Preamble: 7 bytes with pattern 10101010 followed by one byte with pattern 10101011 (start of frame flag) used to synchronizereceiver, sender clock rates & to have the receiver detect the beginning of the frame Addresses: 6 bytes Type: Mux/Demux key
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