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Suppose the RTT between the local host and the Web server containing the object is RTTHTTP 1. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? 2. Suppose the HTML object references 4 very small objects on the same web server Neglecting transmission times, how much time elapses from when the client clicks on the link unti the base object and all 4 additional objects are received from web server at the client, assuming non-persistent HTTP and no parallel TCP connections? 3. Suppose the HTML object references 4 very small objects on the same web server Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received fom web server at the client, assume that the clent is configured to support a maximum of 5 parallel TCP connections, with non-persistent HTTR 4. Suppose the HTML object reforences 4 very small objects on the same web server Neglecting tranemission times, how much time elaapses from when and 14 additional objects are received from web server at the client, assume that the client is

Suppose the RTT between the local host and the Web server containing the object is RTTHTTP 1. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? 2. Suppose the HTML object references 4 very small objects on the same web server Neglecting transmission times, how much time elapses from when the client clicks on the link unti the base object and all 4 additional objects are received from web server at the client, assuming non-persistent HTTP and no parallel TCP connections? 3. Suppose the HTML object references 4 very small objects on the same web server Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received fom web server at the client, assume that the clent is configured to support a maximum of 5 parallel TCP connections, with non-persistent HTTR 4. Suppose the HTML object reforences 4 very small objects on the same web server Neglecting tranemission times, how much time elaapses from when and 14 additional objects are received from web server at the client, assume that the client is

Database System Concepts
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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A & B please 

B. Suppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that two DNS servers are visited before your host receives the IP address from DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTTO = 5 msecs. The second DNS server contacted has an RTT of 8 msecs. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTTHTTP=63 msecs. 1. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? 2. Suppose the HTML object references 4 very small objects on the same web server. Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received from web server at the client, assuming non-persistent HTTP and no parallel TCP connections? 3. Suppose the HTML object references 4 very small objects on the same web server. Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received from web server at the client, assume that the client is configured to support a maximum of 5 parallel TCP connections, with non-persistent HTTR 4. Suppose the HTML object references 4 very small objects on the same web server. Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received from web server at the client, assume that the client is configured to support a maximum of 5 parallel TCP connections, with persistent HTTP.
Transcribed Image Text:B. Suppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that two DNS servers are visited before your host receives the IP address from DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTTO = 5 msecs. The second DNS server contacted has an RTT of 8 msecs. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTTHTTP=63 msecs. 1. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? 2. Suppose the HTML object references 4 very small objects on the same web server. Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received from web server at the client, assuming non-persistent HTTP and no parallel TCP connections? 3. Suppose the HTML object references 4 very small objects on the same web server. Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received from web server at the client, assume that the client is configured to support a maximum of 5 parallel TCP connections, with non-persistent HTTR 4. Suppose the HTML object references 4 very small objects on the same web server. Neglecting transmission times, how much time elapses from when the client clicks on the link until the base object and all 4 additional objects are received from web server at the client, assume that the client is configured to support a maximum of 5 parallel TCP connections, with persistent HTTP.
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