The document discusses different types of computer networks including personal area networks, local area networks, wireless local area networks, campus area networks, metropolitan area networks, wide area networks, and storage area networks. It also discusses network topology, communication media, and some common applications of the Internet such as email, file transfers, video conferencing, and the World Wide Web.

3. Internet is a global communication system
that links together thousands of individual
networks. It allows exchange of information
between two or more computers on a network.
Thus internet helps in transfer of messages
through mail, chat, video & audio conference,
etc.

4. The Internet is a vast network that
connects computers all over the world.
Through the Internet, people can share
information and communicate from
anywhere with an Internet connection

5. Personal Area Network (PAN)
Local Area Network (LAN)
Wireless Local Area Network (WLAN)
Campus Area Network (CAN)
Metropolitan Area Network (MAN)
Wide Area Network (WAN)
Storage-Area Network (SAN)
System-Area Network (also known as SAN)

7. Network topology describes the physical and logical
relationship of nodes in a network, the schematic arrangement
of the links and nodes, or some hybrid combination thereof.
Communication media refer to the ways, means or channels of
transmitting message from sender to the receiver.
Communication media indicate the use of verbal or non-verbal
language in the process of communication. Without language, none
can communicate. Whenever communication takes place, media
are used there.

8. The Internet is a vast network that
connects computers all over the
world. Through the Internet, people
can share information and
communicate from anywhere with an
Internet connection.
Internet was based on the idea that there would be
multiple independent networks of rather arbitrary design,
beginning with the ARPANET as the pioneering packet
switching network, but soon to include packet satellite
networks, ground-based packet radio networks and other
networks.

9.  It works by using a
packet routing
network that follows
Internet Protocol (IP)
and Transport Control
Protocol (TCP) [5]. ...
 TCP and IP work
together to ensure that
data transmission
across the internet is
consistent and reliable,
no matter which device
you're using or where
you're using it.

11.  Electronic Mail (E-mail) ...
 Telenet. ...
 File Transferring. ...
 Video Conference. ...
 World Wide Web (WWW) ...
 E-commerce. ...
 Electronic Fax (E-FAX) ...
 Newsgroup.

12. The World Wide Web, commonly known as the
Web, is an information system where documents
and other web resources are identified by Uniform
Resource Locators, which may be interlinked by
hyperlinks, and are accessible over the Internet

13.  The World Wide Web is based on several
different technologies : Web browsers,
Hypertext Mark up Language (HTML) and
Hypertext Transfer Protocol (HTTP). An
Web browser is used to access web
pages. ... Hyperlinked resources on the
World Wide Web can be accessed using
software interface provided by Web
browsers

14.  Electronic mail (e-mail) is a computer-
based application for the exchange of
messages between users. A worldwide
e-mail network allows people to exchange
e-mail messages very quickly. E-mail is
the electronic equivalent of a letter, but
with advantages in timeliness and
flexibility.

15.  Usenet is collection of online discussions that
are organized into news groups. Users may
create their own discussion topics or contribute
to existing threads within a topic. Some
newsgroups provide forums for questions and
answers, while others are designed primarily for
file sharing
 TELNET stands for terminal NET work. It is a type of
protocol that enables one computer to connect to local
computer. It is a used as a standard TCP/IP protocol
for virtual terminal service which is given by ISO. ...
Local computer uses telnet client program and the
remote computers uses telnet server program.

16.  File Transfer Protocol (FTP) refers to a group
of rules that govern how computers transfer files
between systems over the internet. Businesses
use FTP to send files between computers, and
websites use FTP for the uploading and
downloading of files from their servers.

17.  Intranet: An intranet is a private network that is contained
within an enterprise. Typical intranet for a business
organization consists of many interlinked local area
networks (LAN) and use any Wide Area Network
(WAN) technology for network connectivity. The main
purpose of an intranet is to share company information
and computing resources among employees. Intranet is a
private Internetwork, which is usually created and
maintained by a private organization. The content
available inside Intranet are intended only for the members

18.  An extranet can be viewed as part of a company's
intranet that is extended to users outside the
company like suppliers, vendors, partners,
customers, or other business associates.
 Extranet is required for normal day-to-day business
activities. For example, placing purchase order to
registered vendors, billing & invoices, payments
related activities, joint venture related activities,
product brochures for partners, discounted price
lists for partners etc.