6. Delays. A user in Madagascar, connected to the internet via a 100 Mb/s (b-bits) connectionretrieves a 250 KB (B-bytes) web page from a server in Tokyo, where the page references threeimages of 500 KB each. Assume that the one-way propagation delay is 82 ms and that the user'saccess link is the bandwidth bottleneck for this connection.a. Approximately how long does it take for the page (including images) to appear on the user'sscreen, assuming non-persistent HTTP using a single connection at a time? (For this part, youshould ignore queueing delay and transmission delays at other links in the network)How long does it take if the connection uses persistent HTTP (single connection)?b.c. Suppose that user's access router has a 4 MB buffer (B-byte) on the link from the router to theuser. How much delay does this buffer add during periods when the buffer is full?d.Assume a cache rate of 45% on the information received by the user in Madagascar from theTokyo server. How does this affect your answer in a? Show your work.

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Answered: 6. Delays. A user in Madagascar,…

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

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6. Delays. A user in Madagascar, connected to the internet via a 100 Mb/s (b-bits) connection
retrieves a 250 KB (B-bytes) web page from a server in Tokyo, where the page references three
images of 500 KB each. Assume that the one-way propagation delay is 82 ms and that the user's
access link is the bandwidth bottleneck for this connection.
a. Approximately how long does it take for the page (including images) to appear on the user's
screen, assuming non-persistent HTTP using a single connection at a time? (For this part, you
should ignore queueing delay and transmission delays at other links in the network)
How long does it take if the connection uses persistent HTTP (single connection)?
b.
c. Suppose that user's access router has a 4 MB buffer (B-byte) on the link from the router to the
user. How much delay does this buffer add during periods when the buffer is full?
d.
Assume a cache rate of 45% on the information received by the user in Madagascar from the
Tokyo server. How does this affect your answer in a? Show your work.

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d.)Assume a cache rate of 45% on the information received by the user in Madagascar from the Tokyo server. How does this affect your answer in a? Show your work.

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