12Consider the rdt 2.2 sender and receiver below, with FSM transitions labeled in red. Which of the following sequences of transitions could NOTpossibly occur as a result of an initial rdt_send() call at the sender (with no messages initially in the channel)? There is only one correctanswer. Choose the one you think is correct, and briefly explain why you think it is not possible to occur.A) SO, RO, S1, R1, S2B) SO, RO, S2, S3, R2C) SO, RO, S2, R1, S3D) SO, RO, S1, R1, S1rdt_send(data)sndpkt-make_pkt (0, data, checksum)udt_send(sndpkt)rdt_rev(revpkt) &&(corrupt (revpkt)||isACK (revpkt,1)) (S1)udt_send(sndpkt)Wait forACK 0rdt_rev(revpkt)&& not corrupt (revpkt)&&isACK(revpkt, 1)RDT 2.2 senderAWait forcall 1 fromaboverdt_rev(revpkt) &&(corrupt (revpkt)||(S4) isACK(revpkt,0))udt_send(sndpkt)rdt_send(data)sndpkt-make_pkt (1, data, checksum)udt_send(sndpkt)rdt_rev (revpkt) && notcorrupt (revpkt)&&has_seq0 (revpkt)extract (revpkt, data)deliver_data (data)sndpkt-make_pkt (ACK, 0, checksum)udt_send(sndpkt)Wait forWait forRDT 2.2rdt_rev(revpkt) &&(corrupt (revpkt)||has_seql (revpkt))sndpkt-make_pkt(ACK, 1, checksum)udt_send (sndpkt)0 frombelow1 frombelowreceiverrdt_rev (revpkt) && notcorrupt (revpkt)&&has_seql (revpkt)extract (revpkt, data)deliver_data(data)sndpkt-make_pkt (ACK, 1, checksum)udt_send(sndpkt)(S5)(R3)(SO)Wait forcall 0 fromaboveWait forACK 1(S3)(RO)C(R2)rdt_rev(revpkt)&& notcorrupt (revpkt)&& isACK (revpkt,0)A(R1)(S2)rdt_rev (revpkt) &&(corrupt (revpkt) ||has_seq0(revpkt))sndpkt-make_pkt (ACK, 0, checksum)udt_send(sndpkt)

S0 R0 S1 R1 S1 --- this is possible sequence of transition. S0 is performed at sender when the…

Consider the rdt 2.2 sender and receiver below, with FSM transitions labeled in red. Which of the following sequences of transitions could NOT possibly occur as a result of an initial rdt_send() call at the sender (with no messages initially in the channel)? There is only one correct answer. Choose the one you think is correct, and briefly explain why you think it is not possible to occur. A) SO, RO, S1, R1, S2 B) SO, RO, S2, S3, R2 C) SO, RO, S2, R1, S3 D) SO, RO, S1, R1, S1

Consider the rdt 2.2 sender and receiver below, with FSM transitions labeled in red. Which of the following sequences of transitions could NOT possibly occur as a result of an initial rdt_send() call at the sender (with no messages initially in the channel)? There is only one correct answer. Choose the one you think is correct, and briefly explain why you think it is not possible to occur. A) SO, RO, S1, R1, S2 B) SO, RO, S2, S3, R2 C) SO, RO, S2, R1, S3 D) SO, RO, S1, R1, S1

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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