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Intranet

The main purpose of an intranet is to share companyinformation and computing resources amongemployees.

A simple intranet consists of an internal email

system and perhaps a message board service. Moresophisticated intranets include Web sites anddatabases containing company news, forms, andpersonnel information. Besides email and groupwareapplications, an intranet generally incorporatesinternal Web sites, documents, and/or databases.

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Uses of Intranet

Intranets are used to deliver tools andapplications.

Intranets are also used as corporate culture-change platforms.

Workforce productivity

Communication

Cost-effective

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Difference between Internet andIntranet

Internet

Internet is networkof Computers which isopen for all.

Internet itselfcontains a largenumber of intranets.Unlimited number of

users.

Visitors traffic isunlimited.Contains unlimited

source of information.Collection of various

LANs, WANs andMANs.

Intranet

Intranet is network ofComputers designed for aspecific group of users.

Intranet can be accessedfrom Internet but withrestrictions.

Limited number of Users.

Limited visitors traffic.

Contains only specificgroup purpose

information.

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Extranet

An extranet is a private network that uses Internettechnology and the public telecommunicationsystem 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 thecompany.

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Extranet

It has also been described as a "state of mind" inwhich the Internet is perceived as a way to dobusiness with other companies as well as to sellproducts to customers.

An extranet requires security and privacy. Thesecan include firewall

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Extranet

Definition:

An extranet is a computer network that allowscontrolled access from the outside for specificbusiness or educational purposes. Extranets areextensions to, or segments of, private intranetnetworks that have been built in many corporationsfor information sharing and ecommerce.

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Uses of Extranet to

companies

Exchange large volumes of data using ElectronicData Interchange (EDI)

Share product catalogs exclusively with wholesalersor those "in the trade

Collaborate with other companies on joint

development efforts

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Uses of Extranet to

companiesJointly develop and use training programs with other

companies

Provide or access services provided by one companyto a group of other companies, such as an onlinebanking application managed by one company onbehalf of affiliated banks

Share news of common interest exclusively withpartner companies

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Disadvantages of Extranet

Extranets can be costly to apply and maintain.

protection of extranets when dealing with preciousinformation.

Extranets decrease personal face-to-face contactwith clients and business partners.

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TCP/IP

In 1982 the Internet Protocol Suite (TCP/IP) wasstandardized and the concept of a world-widenetwork of fully interconnected TCP/IP networkscalled the Internet was introduced.

TCP and IP were developed by a Department ofDefense (DOD) research project to connect a numberdifferent networks designed by different vendors intoa network of networks (the "Internet").

The IP component provides routing from thedepartment to the enterprise network, then toregional networks, and finally to the global Internet.

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TCP/IP

As with all other communications protocol, TCP/IP iscomposed of layers:

IP - is responsible for moving packet of data from

node to node. IP forwards each packet based on afour byte destination address (the IP number). TheInternet authorities assign ranges of numbers todifferent organizations. The organizations assigngroups of their numbers to departments. IP operates

on gateway machines that move data fromdepartment to organization to region and then aroundthe world.

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TCP/IP

TCP - is responsible for verifying the correct deliveryof data from client to server. Data can be lost in theintermediate network. TCP adds support to detecterrors or lost data and to trigger retransmission until

the data is correctly and completely received.

Sockets - is a name given to the package ofsubroutines that provide access to TCP/IP on most

systems.

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Uses of TCP/IP

It was initially successful because it delivered a fewbasic services that everyone needs (file transfer,electronic mail, remote logon) across a very largenumber of client and server systems. Several

computers in a small department can use TCP/IP(along with other protocols) on a single LAN.

TCP/IP to be robust and automatically recover fromany node or phone line failure. This design allows the

construction of very large networks with less centralmanagement. However, because of the automaticrecovery, network problems can go undiagnosed anduncorrected for long periods of time.

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Uses of TCP/IP

The Internet Protocol was developed to create aNetwork of Networks (the "Internet").

TCP/IP data can be sent across a LAN, or it can becarried within an internal corporate SNA network, orit can piggyback on the cable TV service.

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TCP/IP reference model

Application layer

Transport layer

Internet layer

Network accesslayer