Problem ZI ). A stop-and-wait protocol (recap textbook Ch 3.3.3 or lecture 9) is a simple data link layer for flow control, in which the sender sends one data frame and then waits for an acknowledgment frame from the receiver before sending the next data frame. We define link utilization rate U for the sender as: U := Ttrans Itotal where Tirans is the sender's transmission time for a date frame and Ttotal is the total duration from the sender starting transmission to receiving the acknowledgment frame. Answer the following questions: 1. Assume this protocol achieves a 20% link utilization rate using 1500-bit data frames over a link with a one-way propagation delay of 50 msec. We ignore the receiver's transmission time for an acknowledgment frame. What is the data rate of this link in bps? 2. Assume this protocol uses 800-bit data frames and runs on a link with a one-way propagation delay of 16 msec and a data rate of 1200 kbps. We assume the acknowledgment needs to be piggybacked on a data frame by the receiver who always has data frames to send back but doesn't need acknowledgment for those. Calculate the link utilization rate U for the sender. (*recap piggybacking in textbook Ch 3.4.1 or lecture 10)

Problem ZI ). A stop-and-wait protocol (recap textbook Ch 3.3.3 or lecture 9) is a simple data link layer for flow control, in which the sender sends one data frame and then waits for an acknowledgment frame from the receiver before sending the next data frame. We define link utilization rate U for the sender as: U := Ttrans Itotal where Tirans is the sender's transmission time for a date frame and Ttotal is the total duration from the sender starting transmission to receiving the acknowledgment frame. Answer the following questions: 1. Assume this protocol achieves a 20% link utilization rate using 1500-bit data frames over a link with a one-way propagation delay of 50 msec. We ignore the receiver's transmission time for an acknowledgment frame. What is the data rate of this link in bps? 2. Assume this protocol uses 800-bit data frames and runs on a link with a one-way propagation delay of 16 msec and a data rate of 1200 kbps. We assume the acknowledgment needs to be piggybacked on a data frame by the receiver who always has data frames to send back but doesn't need acknowledgment for those. Calculate the link utilization rate U for the sender. (*recap piggybacking in textbook Ch 3.4.1 or lecture 10)

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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