Consider the rdt 2.0 sender and receiver shown below, with FSM transitions at the sender labeled S1, S2, and S3; and receiver transitions labeled R1 and R2. Which of the following sequences of transitions could possibly occur as a result of an initial rdt_send() call at the sender, and possible later message corruption and subsequent error recovery. sender R2 rdt_send(data) S1) snkpkt = make_pkt(data, checksum) udt_send(sndpkt) Wait for call from above rdt_rcv(rcvpkt) && isACK(rcvpkt) S3 A rdt_rcv(rcvpkt) && corrupt(rcvpkt) udt_send(NAK) (R1) CH Wait for Wait for ACK or NAK call from below receiver rdt_rcv(rcvpkt) && notcorrupt(rcvpkt) extract(rcvpkt,data) deliver_data(data) udt_send(ACK) rdt_rcv(rcvpkt) && isNAK(rcvpkt) udt_send(sndpkt) S2

Consider the rdt 2.0 sender and receiver shown below, with FSM transitions at the sender labeled S1, S2, and S3; and receiver transitions labeled R1 and R2. Which of the following sequences of transitions could possibly occur as a result of an initial rdt_send() call at the sender, and possible later message corruption and subsequent error recovery. sender R2 rdt_send(data) S1) snkpkt = make_pkt(data, checksum) udt_send(sndpkt) Wait for call from above rdt_rcv(rcvpkt) && isACK(rcvpkt) S3 A rdt_rcv(rcvpkt) && corrupt(rcvpkt) udt_send(NAK) (R1) CH Wait for Wait for ACK or NAK call from below receiver rdt_rcv(rcvpkt) && notcorrupt(rcvpkt) extract(rcvpkt,data) deliver_data(data) udt_send(ACK) rdt_rcv(rcvpkt) && isNAK(rcvpkt) udt_send(sndpkt) S2

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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Question

O S1, R1, S2, R2, S3
OS1, R2, S2
OS1, R1, S2, R1, S3
O S1, R1, S2
O S1, R1, S3
OS1, S2, S3
OS1, R2, S3

Consider the rdt 2.0 sender and receiver shown below, with FSM transitions at the sender labeled S1, S2, and S3; and receiver transitions labeled R1
and R2.
Which of the following sequences of transitions could possibly occur as a result of an initial rdt_send() call at the sender, and possible later message
corruption and subsequent error recovery.
sender
rdt_send(data)
S1 snkpkt = make_pkt(data, checksum)
udt_send(sndpkt)
Wait for
call from
above
Wait for
ACK or
NAK
rdt_rcv(rcvpkt) && isACK(rcvpkt)
S3 A
rdt_rcv(rcvpkt) && corrupt(rcvpkt)
udt_send(NAK) (R1)
Wait for
call from receiver
below
rdt_rcv(rcvpkt) && notcorrupt(rcvpkt)
R2 extract(rcvpkt, data)
deliver_data(data)
udt_send(ACK)
rdt_rcv(rcvpkt) &&
isNAK(rcvpkt)
udt_send(sndpkt)
(S2)

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12 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 rdt_send(data) sndpkt-make_pkt (0, data, checksum) udt_send(sndpkt) rdt_rev(revpkt) && (corrupt (revpkt)|| isACK (revpkt,1)) (S1) udt_send(sndpkt) Wait for ACK 0 rdt_rev(revpkt) && not corrupt (revpkt) &&isACK(revpkt, 1) RDT 2.2 sender A Wait for call 1 from above rdt_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)…
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