1. INTERNET, WWW AND E-MAIL
TOPIC1: NETWORK AND INTERNET
FUNDAMENTAL

2. OUTLINES
 NETWORK COMPONENTS
 WHAT IS NETWORK
 TYPES OF NETWORKS
 BENEFITS
 RISK OF NETWORK COMPUTING
 INTERNET HISTORY
 WHAT IS INTERNET
 WHAT IS INTRANET
 WHAT IS EXTRANET

3. NETWORK DEFINITION
 A network is a set of devices connected by
communication links.
 The connections ( Network Link) between nodes
are established using either cable media or
wireless media
 The best known computer network is the Internet

4. NETWORK COMPONENTS
Computer (sender+ receiver)
2. Message
3. Protocol
1.

5. BENEFITS OF NETWORK
 Resource sharing
–Printer, processing power, disk
space etc
–Reduces cost
 Communication
–Email, chatting, video conferencing

6. RISK OF NETWORKS
COMPUTING
 The risk of leakage of
authenticated data on the
network by the attack of
hackers.

7. TYPES OF NETWOKS

8. LAN
Privately owned over a small
area(500 m)

9. MAN
Bigger version of LAN, Covers an area
as big as a city

10. WAN
Covers whole nation or continent

11. INTERNET HISTORY

12. INTERNET
 The largest network of networks in
the world.
 Uses TCP/IP protocols and packet
switching.
 Runs on any communications
substrate

13. PACKET SWITCHING
 A mode of data transmission in which
a message is broken into a number of
parts
 that are sent independently,
 over whatever route is optimum for
each packet,
 and reassembled at the destination.

14. WHAT IS PROTOCOL
 A protocol is the special set of
rules that end points in a
telecommunication connection.
 use when they communicate.

15. TCP/IP PROTOCOL
 Transmission Control
Protocol/Internet Protocol: TCP/IP
 Is the basic communication
language OR protocol of Internet.

16. TCP: TRANSMISSION CONTROL
PROTOCOL
 Is one of the core protocol of the internet
protocol suite.
 Specify how data should be formatted,
addressed
 When you are set up with direct access to
the internet, your computer is provided with
a copy of the TCP/IP program
 just as every other computer that you may
send message to or get information from
also has a copy of TCP/IP.

17. IP: INTERNET PROTOCOL
 Internet protocol
 Handles the address part of each
packet so that it gets to the right
destination.

18. HOW TCP/IP WOPRKS
How data travels over

19. INTRANET
 A network based on TCP/IP protocols (an
internet) belonging to an organization,
 Is a collection of private computer networks within
an organization.
 accessible only by the organization's members,
employees, or others with authorization.

20. EXTRANET
 refers to an intranet that is partially accessible to




authorized outsiders.
An extranet provides various levels of
accessibility to outsiders.
You can access an extranet only if you have a
valid username and password,
and your identity determines which parts of the
extranet you can view.
Extranets are becoming a very popular means for
business partners to exchange information.

21. TERMENOLOGY
Memex
 the most important mechanism,
conceived by Vannevar Bush
 Brush introduced the idea for a microfilm
based machine for storing and retrieving
knowledge.
 It considered as closed to the modern
hypertext system .

22. TERMENOLOGY
Mathematical theory of
communication:
 is an influential 1948 .
 Article by mathematician Claude E.
Shannon.
 Claude Shannon demonstrate how to
generate “English looking” text using
Markov chains.
 www.khanacademy.org/math/applied-

23. TERMENOLOGY
Silicon Chip:
 was first discovered by Jack S Kilby at
Texas in 1958,
 that are imprinted onto a tiny chip of a
semiconducting material, such as Silicon .
 It’s an electronic equipment consisting of a
small crystal of silicon semiconductor
fabricated to carry out a number of
electronic function in an integrated circuit
 Example: microprocessor chip