Suppose that we attempt to run the sliding window algorithm with SWS = RWS = 3 and with MaxSeqNum = 5. The Nth packet DATA[N] thus actually contains N mod 5 in its sequence number field. Give an example in which the algorithm becomes confused; that is, a scenario in which the receiver expects DATA[5] and accepts DATA[0]—which has the same transmitted sequence number—in its stead. No packets may arrive out of order. Note that this implies MaxSeqNum > 6 is necessary as well as

Suppose that we attempt to run the sliding window algorithm with SWS = RWS = 3 and with MaxSeqNum = 5. The Nth packet DATA[N] thus actually contains N mod 5 in its sequence number field. Give an example in which the algorithm becomes confused; that is, a scenario in which the receiver expects DATA[5] and accepts DATA[0]—which has the same transmitted sequence number—in its stead. No packets may arrive out of order. Note that this implies MaxSeqNum > 6 is necessary as well as

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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Concept explainers

Types Of Protocols

A network protocol is a collection of rules that governs the exchange of data between devices connected to the same network. In other words, network protocols are rules that specify how devices communicate or transfer data over a network. The sender and receiver systems must obey the standards to facilitate communication between them.

Question

Suppose that we attempt to run the sliding window algorithm
with SWS = RWS = 3 and with MaxSeqNum = 5. The Nth packet
DATA[N] thus actually contains N mod 5 in its sequence number
field. Give an example in which the algorithm becomes confused;
that is, a scenario in which the receiver expects DATA[5] and
accepts DATA[0]—which has the same transmitted sequence
number in its stead. No packets may arrive out of order. Note
that this implies MaxSeqNum ≥ 6 is necessary as well as
sufficient.

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