The Internet is a global system of interconnected computer networks that connects billions of users worldwide. It is a network of networks comprising millions of private, public, academic, business, and government networks linked together via various networking technologies. An intranet is a private network within an organization that uses standard network technologies like Ethernet and TCP/IP to facilitate communication and improve data sharing. An intranet typically provides internet access but is protected by a firewall. An extranet extends an intranet by opening the firewall to controlled external partners. Key benefits of intranets include increased and lower-cost internal communication, accessibility of timely information, and easy publication and distribution of information.

1. INTERNETINTERNET
The Internet is a global systemof interconnected computer
networks that use the standard Internet protocol Suite (often
called TCP/IP) to serve billions of users worldwide. It is a
networkof networks that consists of millions of private,
public, academic, business, and government networks, of local
to global scope, that are linked by a broad array of electronic,
wireless and optical networking technologies.

2. INTRANETINTRANET Intranet is the generic term for a
collection of private computer
networks within an organization. An
intranet uses network technologies as
a tool to facilitate communication
between people or work groups to
improve the data sharing capability.
Intranets utilize standard network
hardware and software technologies
like Ethernet, Wi Fi, TCP/IP, Web
browsers and Web servers. An
organization's intranet typically
includes Internet access but
is firewalled so that its computers
cannot be reached directly from the
outside.
A common extension to intranets,
called extranets, opens this firewall to

3. Intranet BenefitsIntranet Benefits
 Increased, less expensive, environmentally friendly
internal communication
 Low acquisition and deployment costs
 Low maintenance costs
 Increased information accessibility
 Timely, current information availability
 Easy information publication, distribution, and training

4. An extranet is a private network that
uses Internet technology and the
public telecommunication system to
securely share part of a business's
information or operations with
suppliers, vendors, partners,
customers, or other businesses. An
extranet can be viewed as part of a
company's intranet that is extended
to users outside the company. An
extranet requires security and
privacy. These can include:
1.Firewall server management
2.use of digital certificates
3.Encryption of messages
4.the use of virtual private networks
(VPNs) that tunnel through the public
network.
EXTRANETEXTRANET

5. Uses of InternetUses of Internet1) Email: By using internet now we can communicate in a fraction of seconds with
a person who is sitting in the other part of the world. Today for better
communication, we can avail the facilities of e-mail. We can chat for hours with
our loved ones.
2) Information: The biggest advantage that internet offering is information. The
internet and the World Wide Web has made it easy for anyone to access
information, and it can be of any type, as the internet is flooded with information.
The internet and the World Wide Web has made it easy for anyone to access
information, and it can be of any type. Any kind of information on any topic is
available on the Internet.
3) Business: World trade has seen a big boom with the help of the internet, as it
has become easier for buyers and sellers to communicate and also to advertise
their sites. Now a days most of the people are using online classified sites to buy
or sell or advertising their products or services.
4) Social Networking: Today social networking sites have become an important
part of the online community. Almost all users are members use it for personal
and business purposes. It is an awesome place to network with many
entrepreneurs who come here to begin building their own personal and business

6. 5) Shopping: In today’s busy life most of us are interested to shop online. Now
a days almost anything can be bought with the use of the internet. In countries
like USA most of consumers prefer to shop from home. We have many
shopping sites on internet like amazon.com, Dealsglobe.com etc.
6) Entertainment: On internet we can find all forms of entertainment from
watching films to playing games online. Almost anyone can find the right kind
of entertainment for themselves. When people surf the Web, there are
numerous things that can be found. Music, hobbies, news and more can be
found and shared on the Internet.
7) E-Commerce: E-commerce is the concept used for any type of commercial
maneuvering, or business deals that involves the transfer of information
across the globe via internet. It has become a phenomenon associated with
any kind of shopping, almost anything. It has got a real amazing and range of
products from household needs, technology to entertainment.
8) Services: Many services are now provided on the internet such as online
banking, job seeking, purchasing tickets for your favorite movies, and
guidance services on array of topics in the every aspect of life, and hotel
reservations and bills paying. Often these services are not available off-line
and can cost you more.

7. Hardware RequirementHardware Requirement
Minimum For InternetMinimum For Internet
ConnectionConnection
 Computerwith browsersoftware
 Modems with communication
software
 800 MHz PentiumIII processor
 512 MBRAM
 80 GBorhigherHard diskcapacity
 High speed internet connection,
cable

8. NetworkingNetworking
Networking is the practice of
linking two ormore computing
devices togetherforthe
purpose of sharing data.
Networks are built with a mix of
computerhardware and
computersoftware.

9. Types of NetworksTypes of Networks
LANs(Local Area Networks)
LANs are networks usually
confined to a geographic area,
such as a single building ora
college campus. LANs can be
small, linking as few as three
computers, but often link
hundreds of computers used by
thousands of people.

10. WIDE AREA
NETWORKS
(WANS)
• Wide area networking combines
multiple LANs that are
geographically separate. This is
accomplished by connecting the
different LANs using services such
as dedicated leased phone lines,
dial-up phone lines (both
synchronous and asynchronous),
satellite links, and data packet
carrierservices.

11. Networkcan be divided in to two main categories:
Peer-to-peer.
Server – based.
In peer-to-peer networking there are no dedicated servers or hierarchy
among the computers. All of the computers are equal and therefore known
as peers. Normally each computer serves as Client/Server and there is no
one assigned to be an administrator responsible for the entire network.
Peer-to-peer networks are good choices for needs of small organizations
where the users are allocated in the same general area, security is not an
issue and the organization and the network will have limited growth within
the foreseeable future.
The term Client/server refers to the concept of sharing the work involved in
processing data between the client computer and the most powerful server
computer.

12. Distributed Networking
Distributed Networking is a
distributed computing network
system, said to be "distributed"
when the computer
programming and the data to be
worked on are spread out over
more than one computer,
usually over a network.

13. Client-server
protocolA client-server protocol is a
protocol in which there is a
single server which listens for
connections, usually on a
specific port and one or more
clients which connect to is one
of three basic groups of
NOS(Network Operating
System). All of the it.
Client-Server Protocol machines
that access the server are called
clients or workstations.

14. SECURITY ONSECURITY ON
NETNET
Internet security is a branch of computer security specifically
related to the Internet, often involving browser security but also
network security on a more general level as it applies to other
applications or on a whole. Its objective is to establish rules and
measures to use against attacks over the Internet. The Internet
represents an insecure channel for exchanging information
leading to a high risk of intrusion or fraud, such as phishing.
Different methods have been used to protect the transfer of
data, including encryption.

16. CHITRA
BENGANI
ROLL NUMBER-
131/3
B.COM (HONS)
SECTION-C