1. What is the reason for including the prefix "WWW in URLS? Why do some URLS not contain the prefix “WW"?

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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Can I have a detailed explanation for Question 1(according to the given instructions)?

Explain the following observations related to the application layer. Use diagrams and calculations
as needed. Mention the references (if any) at the end.
1. What is the reason for including the prefix “WWW" in URLS? Why do some URLS not
contain the prefix "www"?
2. What is the reason for using a pair of MAA (client and server) at the receiver's side in the
following electronic-mail architecture? Why can't we use a pair of MTA here instead of
the pair of MAA?
MTA
client
MAA
UA
Alice
client
Bob
UA
UA: user agent
MTA: message transfer agent
MAA: message access agent
LAN or WAN
LAN or WAN
MTA
MAA
server
server
MTA
МТА
Internet
client
server
System
System
Transcribed Image Text:Explain the following observations related to the application layer. Use diagrams and calculations as needed. Mention the references (if any) at the end. 1. What is the reason for including the prefix “WWW" in URLS? Why do some URLS not contain the prefix "www"? 2. What is the reason for using a pair of MAA (client and server) at the receiver's side in the following electronic-mail architecture? Why can't we use a pair of MTA here instead of the pair of MAA? MTA client MAA UA Alice client Bob UA UA: user agent MTA: message transfer agent MAA: message access agent LAN or WAN LAN or WAN MTA MAA server server MTA МТА Internet client server System System
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