rdt_send(data) rdt rcv(rcvpkt) && SO sndpkt = make_pkt(0, data, checksum) (corrupt(rcvpkt) || udt send(sndpkt) iSACK(revpkt,1) (S1) \\rdt_rcv(rcvpkt) start_timer Λ S9 Λ Wait for Wait call 0 from above for timeout (S2) ACKO udt send(sndpkt) rdt_rcv(rcvpkt) && notcorrupt(revpkt) $8)&& isACK(rcvpkt, 1) stop_timer rdt3.0 sender start_timer rdt_rcv(rcvpkt) && notcorrupt(rcvpkt) && isACK(rcvpkt,0) S3 stop_timer Wait for call 1 from above rdt rcv(rcvpkt Λ S4 Wait timeout 57) for udt_send(sndpkt) ACK1 start_timer rdt rcv(rcvpkt) && ydt send(data) (S5 (corrupt(rcvpkt) || isACK(rcvpkt,0)) (S6 Λ sndpkt = make_pkt(1, data, checksum) udt send(sndpkt) start_timer rdt_rev (revpkt) && notcorrupt (rcvpkt) && has_seq0 (rcvpkt) (RO) extract (rcvpkt, data) deliver_data(data) sndpkt=make_pkt (ACK,0, checksum) udt_send(sndpkt) rdt_rev (revpkt) && (corrupt (revpkt) || has_seq0 (revpkt)) (R1) aka 2.2 Wait for 1 from below sndpkt-make_pkt (ACK,0, checksum) udt_send(sndpkt) ว R3) rdt_rev (revpkt) && (corrupt (revpkt) || has_seq1 (rcvpkt)) sndpkt-make_pkt (ACK, 1, checksum) udt_send(sndpkt) Wait for 0 from below RDT 3.0 receiver rdt_rev (revpkt) && notcorrupt (revpkt) && has_seql (rcvpkt) (R2) extract (rcvpkt, data) deliver_data(data) sndpkt make_pkt (ACK,1, checksum) udt_send(sndpkt) Transition t3 is: Drag answer here S8 Transition t4 is: Drag answer here R2 S3 Transition t2 is: Drag answer here S5 Transition t1 is: Drag answer here

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