How does the Internet work?
The Internet is a network of interconnected computers around the world. Packets of data are exchanged over this network.
The Internet has existed since 1969 when 4 computers or hosts were linked together in the ARPAnet system.
Email was invented by Ray Tomlinson of BBN in 1972.
By 1980, Email and data exchange the primary activity for the 213 hosts from the US government, researchers and universities.
Many countries began to link into the network. The first virtual community was the Well in 1985.
In 1991, Tim Berners-Lee released the World Wide Web (WWW) protocol that used hypertext to link documents together.
When you click on a link, you are using hypertext to connect to some other information from another web site or from some other part page on a website.
The commercial use of the Internet was allowed after the NSF lifted the restriction. By 1992, there were 1 million hosts on the Internet.
2006 was the 25-Year Anniversary of the PC that began in 1981
Each computer connected to the Internet has a unique IP address that consists of a 32-bit number that is broken up into four parts separated by a dot. Each part has an 8- bit numbers in the range 0 to 255 called octets.
CIDR (Classless Inter-Domain Routing) uses a network prefix to identify a network gateway. The CIDR acts like a area code in a phone number. In the CIDR address 220.127.116.11/23, the "/23" showes the first 23 bits refer to a unique networkand the rest refer to a specific IP host.