Presentation include about network terminology, topology, internet and its history.

2.  Introduction to the Internet and the Web,
Client-Server Relationship
 Safe Surfing Mode: Malware, Worms,
Trojans, Viruses, Phishing, Spam, Bots
 Steps to integrate ICT in Education and the
related challenges.
 ICT in Publication and Evaluation.
 Developing ICT Based Lesson Plan

3. The Internet has revolutionized the computer and
communications world like nothing before. The invention of
the telegraph, telephone, radio, and computer set the
stage for this unprecedented integration of capabilities.
The Internet is at once a world-wide broadcasting
capability, a mechanism for information dissemination, and
a medium for collaboration and interaction between
individuals and their computers without regard for
geographic location. The Internet represents one of the
most successful examples of the benefits of sustained
investment and commitment to research and development
of information infrastructure.

4.  The Internet is the global system of
interconnected computer networks that uses the
Internet protocol suite to communicate between
networks and devices.
 It is a network of networks that consists of
private, public, academic, business, and
government networks of local to global scope,
linked by a broad array of electronic, wireless,
and optical networking technologies.

5.  The Internet carries a vast range of
information resources and services, such as
the inter-linked hypertext documents and
applications of the World Wide Web,
electronic mail, telephony, and file sharing.

6.  Networking is the connectivity between
computers to share information, data, files
etc.. It may be locally or global.
Definition of Network: A computer network,
often simply referred to as a network, is a
collection of hardware components and
computers interconnected by communication
channels that allow sharing of resources and
information.

7. a) Load Sharing
b) Message Service
c) Data Sharing
d) Program Sharing
e) Remote Service

8.  Facilitate communications
 Permit sharing of files, data, and other types
of information
 Share network and computing resources

9.  INTRANET
 EXTRANET
 LAN: Local Area Network
 WAN: Wide Area Network
 EPN: Enterprise Private Network
 VPN: Virtual Private Network

10. Intranet: An intranet is a set of networks, using the
Internet Protocol and IP-based tools such as web
browsers and file transfer applications, that is
under the control of a single administrative entity.
That administrative entity closes the intranet to all
but specific, authorized users. Most commonly,
an intranet is the internal network of an
organization. A large intranet will typically
have at least one web server to provide users
with organizational information.

11. Extranet: An Extranet is a computer network used
outside the intranet. An extranet is a computer
network that allows controlled access from the
outside, for specific business or educational
purposes. In a business-to-business context, an
extranet can be viewed as an extension of an
organization's intranet that is extended to users
outside the organization, usually partners, vendors
and suppliers, in isolation from all other Internet
users.

12. Local area network: A local area Network
(LAN) is a network that connects computers
and devices in a limited geographical area
such as home, school, computer laboratory,
office building, or closely positioned group of
buildings. Each computer or device on the
network is a node.

13. Wide area network: A wide area Network
(WAN) is a computer network that covers a
large geographic area such as a city, country,
or spans even intercontinental distances, using
a communications channel that combines
many types of media such as telephone lines,
cables, and air waves. A WAN often uses
transmission facilities provided by common
carriers, such as telephone companies.

14. Enterprise private network An enterprise private network is
a network built by an enterprise to interconnect various
company sites, e.g., production sites, head offices, remote
offices, shops, in order to share computer resources.

15. Virtual private network: A virtual private network
(VPN) is a computer network in which some of the
links between nodes are carried by open
connections or virtual circuits in some larger network
(e.g., the Internet) instead of by physical wires. The
data link layer protocols of the virtual network are
said to be tunneled through the larger network when
this is the case. One common application is secure
communications through the public Internet, but a
VPN need not have explicit security features, such
as authentication or content encryption.

16. A network topology is the layout of the
interconnections of the nodes of a computer
network. Network topology signifies the way in
which devices in the network see their logical
relations to one another.Common Networks are
1) Bus Network: all nodes are connected to a
common medium along this medium.
2) A star network: all nodes are connected to a
special central node.

17. 3) A ring network: each node is connected to its left
and right neighbour node, such that all nodes are
connected and that each node can reach each other
node by traversing nodes left- or rightwards.
4) A mesh network: each node is connected to an
arbitrary number of neighbours in such a way that
there is at least one traversal from any node to any
other.
5) A fully connected network: each node is
connected to every other node in the network

19. In the late 1950's the Advanced Research Projects Agency (ARPA)
was founded in the United States with the primary focus of
developing information technologies that could survive a nuclear
attack.
In 1967 ARPA university and private sector contractors met with
representatives of the Department of Defense to discuss possible
protocols for sharing information via computers.
In 1969, the U.S. Defence Department funded a project to develop
a network, which can withstand the bombing. Basically the idea
was to develop a very secure network which can work even after a
nuclear attack. This project was known as ARPANET.

20. The proposed network was not supposed to have a central
control—which would be an obvious target. It connected four sites
at the University of California at Los Angeles, the University of
California at Santa Barbara, Stanford Research Institute, and the
University of Utah.
Throughout the 1970's researchers concentrated on developing
protocols forcontrolling networks, moving messages across a
system of networks, and allowing for remote access to the
networks. There were computers connected at about two dozen
sites when the first email was sent in 1972, but the number of sites
and messages soon mushroomed. By 1975 there were 63 sites.

21. This standard used by ARPANET is known as NCP
(National Control Protocol). Protocol is a network term used
to indicate the standard used by a network for
communication.
NCP converted into TCP/IP (Transmission Control
Protocol/Internet Protocol).

22. TCP "converts messages into streams of packets at the
source, and they are reassembled back into messages at
the destination. IP handles the dispatch of these packets. It
handles the addressing, and makes sure that a packet
reaches its destination through multiple nodes and even
across multiple networks with multiple standards. This
flexibility of TCP/IP to handle multiple networks with
multiple protocols encourages other networks to get
connected to ARPANET. Slowly the ARPANET became a
massive network of networks and now it is known as
‘Internet’.

23.  Internet service provider – an internet service provider
provides you with a connection to the internet and the software
you will need to navigate.
 Telecommunication line – a telephone line is required to
connect you to the internet service provider.
 Modem – a modem converts a digital signal received from a
computer into an analogue signal that can be sent along
ordinary telephone lines, and back to digital at the other end.
 Web browser – a web browser is software used to view and
download Web pages and various types of files such as text,
graphics and video. Examples are Microsoft Internet Explorer or
Mozilla Firefox, Google Chrome.

24.  E-mail
 File Transfer Protocol (FTP)
 Telnet
 World Wide Web (WWW)

25. E-mail or Electronic mail is a paperless method
of sending messages, notes or letters from one
person to another or even many people at the
same time via the Internet.
E-mail is very fast compared to the normal
post. E-mail messages usually take only few
seconds to arrive at their destination. One can
send messages anytime of the day or night
and it will get delivered immediately.

26.  One-to-one or one-to-many
communications
 Instant communications
 Physical presence of recipient is not
required
 Most inexpensive mail service, 24-hours a
day and seven days a week
 Encourages informal communication

27. File Transfer Protocol, is an Internet utility software used to upload and
download files. It gives access to directories or folders on remote
computers and allows software, data and text files to be transferred
between different kinds of computers. FTP works on the basis of same
principle as that of Client/Server.
FTP "Client" is a program running on the your computer that enables
you to talk to, and get stuff from, remote computers. The FTP client
takes FTP commands and sends them as requests for information
from the remote computer or known as FTP servers. To access
remote FTP server it is required but not necessary to have an account
in the FTP server. When the FTP client gets connected, FTP server
asks forthe identification in-terms of User Login name and password of
the FTP client. If one does not have an account in the remote FTP
server, still he can connect to the server using anonymous login.

28.  to give flexibility and promote sharing of
computer programs, files and data
 to transfer data reliably and more
efficiently over network
 to encourage implicit or indirect use of
remote computers using Internet
 to shield a user from variations in file
storage systems among hosts.

29. Telnet or remote computing is telecommunication utility software,
which uses available telecommunication facility and allows you to
become a user on a remote computer. Once you gain access to the
remote computer, you can use it for the intended purpose.
The TELNET works in a very step by step procedure. The
commands typed on the client computer are sent to the local
Internet Service Provider (ISP), and then from the ISP to the
remote computer that you have gained access. Most of the ISP
provides facility to TELNET into your own account from another city
and check your e-mail while you are travelling or away on business.

30. The WWW is a system that we use to access the Internet. The WWW
is hypertext based information retrieval tool, it uses the hypertext to
access the various forms of information available on the world’s
different networks.
One can easily surf the Web by jumping from one document to another
using the links in those documents. These documents can be in many
formats, such as text, graphics, animation, sound and latest is video.
They may also be a combination of all these.
All the information on Internet are presented to the user as a document
or more popularly known as Web Page. All these Web Pages are link
to each other or even to section within a Web Page. And these links
are known as Hyper Links.

31.  Broad Band Internet Connection:The term
broadband refers to any type of transmission
technique that carries several data channels
over a common wire. e.g.Cable Connection
Wirelessless Connection (Radio Frequency
Bands)
 Dial-up Connection: Dial up networking
technology provides PCs and other network
devices access to a LAN or WAN via
standard telephone lines.

32. Satellite Internet is a form of high-speed Internet service.
Satellite Internet services utilize telecommunications
satellites in Earth orbit to provide Internet access to
consumers. Internet over Satellite (IoS) allows a user to
access the Internet via a satellite that orbits the earth. A
satellite is placed at a static point above the earth's
surface, in a fixed position. Because of the enormous
distances signals must travel from the earth up to the
satellite and back again, IoS is slightly slower than high-
speed terrestrial connections over copper or fiber optic
cables.