rdt2.0: in action(no errors) rat rcv(rcvpkt)&& corrupt(rcvpkt) rat send(data) udt send(NACK compute checksum make pkt(sndpkt, data, checksum) udt send( sndpkt wait fo W ait for rat rcv(rcvpkt && isNACK(rcvpkt) cd‖from ca‖from ACK or below above AK udt send(sndpkt rat rcv(rcvpkt rat rcv(rcvpkt)&& & SACKIrcvokt notcorrupt(rcvpkt) extract(rcvpkt, data deliver data(data uat send(ACK) sender FSM receiver FSM 3: Transport Layer 3a-163: Transport Layer 3a-16 rdt2.0: in action (no errors) sender FSM receiver FSM