Ethernet frame format Preamble DA SA Type DATA Pad CRC field size(byte) 기능 Preamble 8 ·송신측과수신측간의송/수신속도를일치시키기위 한bit synchronization · 10101010이8회연속반복되는64비트로구성 DA (Destination Address) 6 · Block ID (3 byte) + MAC address( 3 byte) -- Block ID LSB Individual Multicast NIC 제조회사를식별하는code LSB 0 : 하나의목적지스테이션 LSB 1 : Multicast Address 모든비트1 : Broadcast(ARP,RARP에사용) SA (Sourse Address) 6 · MAC controller가..