advantage of internet
§Relatively
Inexpensive
It is relatively inexpensive
to publish information on the Internet.
At a fraction of the cost to publish information by traditional methods,
various organizations and individuals can now distribute information to
millions of users. It costs only a few thousand dollars to establish an
Internet presence and publish content on the Internet.
§Online
Surveys
Traditional methods of performing surveys
are often relatively slow and expensive compared to online surveys conducted on
the Internet.
disadvantage of internet
§Theft of Personal Information
If you use the Internet for online
banking, social networking or other services, you may risk a theft to your
personal information such as name, address, credit card number etc.
Unscrupulous people can access this information through unsecured connections
or by planting software and then use your personal details for their benefit.
Spamming
Spamming
refers to sending unwanted e-mails in bulk, which provide no purpose and
needlessly obstruct the entire system. Such illegal activities can be very
frustrating for you as it makes your Internet slower and less reliable
§Intranet
›Definition
§1. Is a network that belongs to an enterprise and
is a accessible only by that enterprise’s employees or authorized users.
(Computer Are your Future:
Complete, Catherine LaBerta)
§2.
A private network that is set up similar
to the Internet and is accessed via a web browser.
(Understanding
Computers Today and Tomorrow Comprehensive, Deborah Morley & Charles)
§3. (means
within)
is an internal network that uses Internet technologies.
›~Uses of intranets include groupware
applications, such as project management, chat rooms, group scheduling and
video conferencing.
›~Intranet typically provides e-mail,
mailing lists, newsgroup and FTP services accessible only
to those within the organization.
~Intranets are intended only for intended use and aren’t accessible from the external Internet unless the user has a
registered user name and password.
§Extranet
›1. An intranet that
is at least partially accessible to authorized outsiders (suppliers, customers
and business partner).
OR
›2. Portion of a company’s network that
allows customers or suppliers of a company to access parts of an enterprise’s
intranet
OR
›3. Is a private network that
connects more than one organizations that use Internet technologies to allow
suppliers, customers and business partner limited access to their network.
~Usually accessed via the Internet and
they can be used to provide customers and business partners with access to the
data they need
|
Categories
|
Internet
|
Intranet
|
Extranet
|
|
Definition
|
The largest and most well-known computer network,
linking millions of computers all over the world.
|
Is a network
that belongs to an enterprise and is a accessible only by that enterprise’s
employees or authorized users.
|
Is a private network that connects
more than one organizations that use Internet technologies to allow suppliers,
customers and business partner limited access to their network
|
|
Types of users
|
Provide
information for public
|
Provide
information for organization employees
|
Provide
information to suppliers, customers and business partner
|
|
Usages
|
Access all
kinds of information
|
Telephone directories,
Employee Information, E-mail
|
Access data,
check status place order, send email
|
§What
Can We Use the Internet For?
•View
web pages on the WWW (World-Wide Web).
•Sending
and receiving e-mail messages.
•Sharing
files.
•Communicating
using voice (VOIP) and video (video-conferencing).
•Playing
multi-player games.
•Listening
to streamed music or watching streamed video.
§Many home and small business users
connect to the Internet via high-speed
broadband Internet service and dial-up connection.
|
dial-upconnection(slowspeed)
|
BROADBAND CONNECION(HIGH SPEED)
|
|
•
Dial-Up Connection
|
•DSL (Digital Subscriber Line)
•Fiber to the Premises (FTTP)
•Fixed Wireless
•Cellular Radio Network
•Cable
Internet Service
•Wi-Fi
•Satellite Internet Service
|
§Low-speed
Internet Service:
•Dial-up access takes place when the modem in your computer connects to
the Internet via a standard telephone line that transmits data and information
using an analog (continuous wave pattern) signal.
High-speed
Broadband Internet Service
~DSL
(Digital Subscriber Line:
•Provides high-speed Internet connections using regular copper telephone
lines.
~Fiber to the Premises (FTTP):
•Uses fiber-optic cable to provide high-speed Internet access to home
and business users.
•Fixed Wireless:
•Provides high-speed Internet connections using a dish-shaped antenna on
your house or business to communicate with a tower location via radio signals.
|
•Wi-Fi (Wireless Fidelity)
|
•Network uses radio signals to provide high-speed Internet connections
to compatible or properly equipped wirelesscomputers and devices.
|
|
•Satellite Internet Service
|
Provides high-speed Internet connections via satellite to a satellite
dish that communicates with a satellite modem |
|
•Cellular Radio Network
|
Offers high-speed Internet connections to devices with
built-in compatible technology or computers with wireless modems |
|
•Cable
Internet Service
|
•Provides high-speed Internet access through the cable television
network via a cable modem.
|
§What
is Data Transfer Rate?
•Data transfer rate,
is the speed at which data can be transmitted between devices.
•The
data transfer rate of a device is often expressed in kilobits or megabits per second,
abbreviated as kbps
and mbps
respectively.
•It
might also be expressed in kilobytes or megabytes, or KB/sec and MB/sec.
