The Internet By Rory Gallagher. What is The Internet? The internet is a worldwide, publicly...
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Transcript of The Internet By Rory Gallagher. What is The Internet? The internet is a worldwide, publicly...
The InternetBy Rory Gallagher
What is The Internet?
The internet is a worldwide, publicly accessible network of interconnected computer networks.
The internet carries lots of superinformation and services such as e-mail, online chat, file transfer and lots more!!
But how can we connect to the internet?
What additional hardware, software and other services are required to
access this tool??
You will need…
A modem A computer An internet browser Possibly a phone line… An account with an ISP
Hardware
To connect to the internet the hardware you
will require is a;
Computer Modem
Connecting To The Internet
You need a computer to communicate with another computer by using a telephone line. The problem is that computers use digital signals (i.e. 0 and
1’s)whilst telephones use an analogue signal.
And Therefore a modem is required to convert these signals…
What’s a Modem?!
The modem will usually be connected to a
Computer and its function is to modulate & demodulate.
In other words to convert the digital signal
from the computer to a analogue signal to be
sent over a phone line and vice versa.
Types of Modems…
There is many different types of modems available depending on
how you are connecting to the internet…
For example:
Types of Modems…- An analogue Modem To use with an ordinary phone line. This modem links your computer to the phone and converts computer signals to analogue phone line signals – and back again. The most common speed is 56kbps – very slow.
- An ISDN line & terminal adaptorIs a digital connection and slightly faster than analogue – 128kbps – still very slow.
- An ADSL or cable telephone line and broadband modemThis method is the most popular and is very fast – Up to 24mb Or 24000kbps.
- Radio/Wireless ModemsA modem which provides a Wireless Connection for connection to pc’s
and laptops etc. without wires. It normally includes a broadband modem to connect.
Example ModemADSL Wireless Router Modem
ISP’s
With a modem you are now able to send signals along the
telephone line to the telephone exchange
but where do they go after that?
You need to decide who is going to handle the link fromthe telephone exchange to the Internet for you.
There are companies called Internet Service Providersor ISP for short that do this for you.
What is an ISP?
Definition ISPs or Internet Service Providers are
the companies who provide you with access to the internet. Commonly used ISPs include BT, Orange, AOL, and Virgin. Most offer the same basic package of Internet access, email addresses, web space for your own pages and local rate call charges.
Examples of an ISP
Software
To browse the internet you will require an
Internet Browser
What’s an Internet Browser?
A web browser is a software application is
that enables a user to display and interact
with text, images and other information typically located on a webpage on at a website on the world wide web or a local
area network.
Features of an Internet BrowserAll browsers will have a number of similar
features to help you use the Web: Forward and back buttons to move between
pages A history folder which stores details of
recently visited web pages A stop button if a page is taking too long to
load Favourites and bookmark options to store
often visited pages Options to cut, copy, save and print the
information viewed
Examples of Internet Browser
Opera Browser
Examples of Internet Browser
Mozilla Firefox
Examples of Internet Browser
Internet Explorer
The Internet
So basically this is how you are connected to the internet;
PC (with internet browser) Modem + ISP
Homework!
For your homework you will give a full definition of;
- Modem- ISP- Internet Browser
Hint : Use your Textbook! The End