7. Consider the problem of recovering from host crashes (i.e., Fig. 6-18 of textbook; see below). If the interval between writing and sending an acknowledgement, or vice versa, can be made relatively small, what are the two best sender-receiver strategies, for minimizing the chance of a protocol failure? Explain why. Strategy used by receiving host Strategy used by sending host Always retransmit Never retransmit Retransmit in SO Retransmit in S1 First ACK, then write AC(W) AWC C(AW) OK OK DUP OK LOST LOST DUP LOST OK LOST OK OK OK DUP LOST Protocol loses a message First write, then ACK C(WA) OK LOST LOST OK = Protocol functions correctly Protocol generates a duplicate message WAC WC(A) DUP DUP OK OK OK DUP DUP OK
7. Consider the problem of recovering from host crashes (i.e., Fig. 6-18 of textbook; see below). If the interval between writing and sending an acknowledgement, or vice versa, can be made relatively small, what are the two best sender-receiver strategies, for minimizing the chance of a protocol failure? Explain why. Strategy used by receiving host Strategy used by sending host Always retransmit Never retransmit Retransmit in SO Retransmit in S1 First ACK, then write AC(W) AWC C(AW) OK OK DUP OK LOST LOST DUP LOST OK LOST OK OK OK DUP LOST Protocol loses a message First write, then ACK C(WA) OK LOST LOST OK = Protocol functions correctly Protocol generates a duplicate message WAC WC(A) DUP DUP OK OK OK DUP DUP OK
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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Transcribed Image Text:7.
Consider the problem of recovering from host crashes (i.e., Fig. 6-18 of textbook;
see below). If the interval between writing and sending an acknowledgement, or vice versa,
can be made relatively small, what are the two best sender-receiver strategies, for
minimizing the chance of a protocol failure? Explain why.
Strategy used by receiving host
Strategy used by
sending host
Always retransmit
Never retransmit
Retransmit in SO
Retransmit in S1
First ACK, then write
AC(W) AWC
C(AW)
OK
OK
LOST
DUP
OK
LOST
DUP LOST
OK
OK
OK
LOST
First write, then ACK
C(WA) WAC
DUP
OK
DUP
OK
LOST
LOST
OK
OK
= Protocol functions correctly
DUP Protocol generates a duplicate message
LOST Protocol loses a message
WC(A)
DUP
OK
OK
DUP
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