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What is intranet
 Features
 Architecture
 Merits
 applications
 What is Extranet
 Components
 Structure
 Advantages
 Disadvantages
 Layered system view
 Relationship between intranet & Extranet
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An intranet is a computer network that uses Internet Protocol technology
to share information, operational systems, or computing services within an
organization.
An intranet delivers collaboration and coordination to employees around the
clock
◦ Communication system designed by technical staff
◦ Focus is the message, not the media
Normally runs in a client/server environment and a local area network
configuration
Separated from other networks by firewalls, a means of preventing
unauthorized access to the company’s internal data or leaks of sensitive
company information
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Integration
Security
Collaboration
Communication Channels
Automation
User Friendly
Remote Access
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server
Clients
Public/External
Internet Users
Intranet
web
servers
Firewalls
databases
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Email
servers
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Workforce productivity
Time
Communication
Web publishing
Business operations and management
Cost-effective
Workforce productivity
Time
Communication
Web publishing
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Sharing of company policies/rules & regulations
Sharing of information of common interest
Access product & customer data
Launching of personal/departmental home pages
Submission of reports
Corporate telephone directories
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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.
 Extranet is an Intranet for outside authorized users using same
internet technology.
 Inter-organizational information system.
 enable outsiders to work together with company’s employees.
 open to selected suppliers, customers & other business partners
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Extranets first appeared within a year of the creation of
Intranets, around 1995. Like Intranets, early Extranets were
initially available only to large corporations, which used the
technology to provide customers and suppliers with access to the
company's network. Libraries soon adopted the technology. The
first states to use library Extranets included Alaska, Colorado,
Oregon, Rhode Island and Utah.
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Some basic infrastructure components such as the internet
Including : TCP/IP protocols
 E-mail
 Web-browsers
 External business partners &
 Tele-commuting employees place order, check status & send Email.
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Extranet
Suppliers
Firewall
VPN
Intranet
VPN
Tunneling
Internet
distributers
Intranet
Firewall
VPN
customers
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Exchange large volumes of data using Electronic Data
Interchange (EDI)
Share product catalogs exclusively with trade partners
Collaborate with other companies on joint development efforts
Jointly develop and use training programs with other companies
Provide or access services provided by one company to a group
of other companies, such as an online banking application
managed by one company on behalf of affiliated banks
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Extranets can be expensive to implement and maintain within
an organization (e.g., hardware, software, employee training
costs), if hosted internally rather than by an application service
provider.
Security of extranets can be a concern when hosting valuable or
proprietary information.
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Intranet
Extranet
Corporate members
Clients, partners, customers
Internet
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An
extranet could be understood as an intranet mapped onto the public
Internet or some other transmission system not accessible to the general
public, but managed by more than one company's administrator(s). For
example, military networks of different security levels may map onto a
common military radio transmission system that never connects to the
Internet.
Similarly, for smaller, geographically united organizations, "extranet" is a
useful term to describe selective access to intranet systems granted to
suppliers, customers, or other companies. Such access does not involve
tunneling, but rather simply an authentication mechanism to a web server.
In this sense, an "extranet" designates the "private part" of a website, where
"registered users" can navigate, enabled by authentication mechanisms on a
"login page".
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