rdt2.1: sender, handles garbled ACK/NAKs rdf send( data compute chksum make pkt(sndpkt, 0, data, chksum) udt send(sndpkt rat rcv(rcvpkt)&& corrupt(rcvpkt) I wait for wait isNAK(rcvpkt)) callO from ACK OI udt send(sndpkt) above NAK rcv(rcvpkt & notcorrupt(rcvpkt rat rcv(rcvpkt & isACK(rcvpkt & notcorrupt(rcvpkt) & isACK(rcvpkt rat rcv(rcvpkt)&& wait lit fo 〔 corrupt(rcvpkt ACK O NAK(rcvpkt)) NAK a‖ I fror above udt send(sndpkt) rdf send data compute chksum make pkt(sndpkt, 1, data, chksum udf send(sndpkt 3: Transport Layer 3a-193: Transport Layer 3a-19 rdt2.1: sender, handles garbled ACK/NAKs