The document discusses the history and growth of the internet. It defines the internet as a network of networks that connects government, university, and private computers globally to share email, files, and other resources. Key events included the creation of ARPANET in 1969, development of TCP in 1974, and adoption of TCP/IP in 1984. The internet grew from 1000 hosts in 1984 to become the largest network in the world. Intranets are internal corporate networks using internet standards, while extranets connect a company's intranet to partners via VPN tunnels over the public internet.

2. Internet History
and Growth
Diff Between Internet , Intranet
And Extranet

3. What Is the Internet?
 A network of networks, joining many government,
university and private computers together and
providing an infrastructure for the use of E-mail,
bulletin boards, file archives, hypertext documents,
databases and other computational resources
 The vast collection of computer networks which form
and act as a single huge network for transport of data
and messages across distances which can be
anywhere from the same office to anywhere in the
world.

4. What is the Internet?
 The largest network of networks in the world.
 Uses TCP/IP protocols and packet switching .
 Runs on any communications substrate.
 TCP/IP, Transmission Control Protocol/Internet
Protocol, is a suite of communications protocols used
to interconnect network devices on the
Internet.TCP/IP implements layers of protocol stacks,
and each layer provides a well-defined network
services to the upper layer protocol.

5. Brief History of the Internet
 1968 - DARPA (Defense Advanced Research Projects Agency)
contracts with BBN (Bolt, Beranek & Newman) to create
ARPAnet
 1970 - First five nodes:
 UCLA
 Stanford
 UC Santa Barbara
 U of Utah, and
 BBN
 1974 - TCP specification by Vint Cerf
 1984 – On January 1, the Internet with its 1000 hosts
converts all together to use TCP/IP for its messaging

6. A Brief Summary of the
Evolution of the Internet
1945 1995
Memex
Conceived
1945
WWW
Created
1989
Mosaic
Created
1993
A
Mathematical
Theory of
Communication
1948
Packet
Switching
Invented
1964
Silicon
Chip
1958
First Vast
Computer
Network
Envisioned
1962
ARPANET
1969
TCP/IP
Created
1972
Internet
Named
and
Goes
TCP/IP
1984
Hypertext
Invented
1965
Age of
eCommerce
Begins
1995

7. Intranets and Extranets
 Intranet
 Internal corporate network built using Internet and World
Wide Web standards and products
 Slashes the need for paper
 Provides employees with an easy and intuitive approach
to access information that was previously difficult to
obtain

8. Intranets and Extranets
(continued)
 Extranet: a network based on Web technologies that
links selected resources of a company’s intranet with
its customers, suppliers, or other business partners
 Virtual private network (VPN): a secure connection
between two points across the Internet
 Tunneling: the process by which VPNs transfer
information by encapsulating traffic in IP packets over
the Internet