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What exactly is the internet, and how
1. What is a Network?
A network consists of two or more computers that
are linked together to share resources (such as
printers and files), or to allow electronic
communications.
1
2. What is a Network?
The computers on a network may be linked through
cables, telephone lines, radio waves, satellites, or
infrared light beams.
3. Two basic types of networks:
Local Area Network and
Wide Area Network
5. Local Area Network
A Local Area Network (LAN) is usually confined to
a small geographic area such as a school, or
hospital.
6. Local Area Network
In a typical LAN configuration, one computer is
designated as the file server.
It stores all of the software that controls the
network, as well as the software that can be
shared by the computers attached to the network.
7. How do they Communicate?
Computers connected to the file server are called
workstations.
The workstations can be less powerful than the
file server, and they may have additional software
on their hard drives.
8. How do they Communicate?
On most LANs, cables are used to connect the
computers together.
Wireless is becoming more and more popular and is
what our iPads use to communicate.
9. Wide Area Network
Wide Area Networks (WANs) connect larger
geographic areas, such as Towns, Counties, or the
world (WWW).
10. Wide Area Network
Using a WAN, schools in can communicate with places
like America in a matter of seconds
A WAN is very complicated.
It uses special equipment to connect local and other
WANs to global communications networks like the
Internet.
To users, however, a WAN will not appear to be much
different than a LAN.
13. Speed
Networks provide a rapid method for sharing and
transferring files.
Without a network, files are shared by copying
them to memory pens, then carrying or sending the
pens from one computer to another.
This method of transferring files (referred to as
sneaker-net ) is time-consuming.
14. Cost
Networkable versions of many popular software
programs are available at considerable savings
when compared to buying individually licensed
copies.
15. Cost in Time
Besides monetary savings, sharing a program on a
network allows for easier upgrading of the
program.
The changes have to be done only once, on the file
server, instead of on all the individual
workstations.
16. Security
Files and programs on a network can be designated
to particular workstations only.
Also, passwords can be created for specific files.
17. Electronic Mail
If the LAN is connected to the Internet, Teachers
and Staff can communicate with others throughout
the world.
18. Flexible Access .
School networks allow students to access their
files from computers throughout the school.
Students can begin work in their classroom, save
part of it on the network, and then go to a
different part of the school to finish their work.
19. Flexible Access .
As you know we have done this by starting work on
an iPad and completing it in the Suite.
Students can also work cooperatively (together)
through the network.
20.
21. What exactly is the Internet,
and how does it work?
In the early days, most people just used the
Internet to search for information.
Today's Internet is a constantly evolving tool that
not only contains an amazing variety of information
but that also provides new ways of accessing,
interacting, and connecting with people and
content.
As a result, new terms are constantly appearing as
new technologies are introduced.
22. So, what is the Internet
What is the Internet? The Internet is the largest
computer network in the world, connecting millions
of computers.
23. www
The World Wide Web
When most people think of the Internet, the first
thing they think about is the World Wide Web.
Nowadays, the terms "Internet" and "World Wide
Web" are often used interchangeably—but they're
actually not the same thing.
The Internet is the physical network of computers
all over the world.
24. www
The World Wide Web is a virtual network of
websites connected by hyperlinks (or "links").
Websites are stored on servers on the Internet,
so the World Wide Web is a part of the Internet.
25. www
HTML The backbone of the World Wide Web is
made of HTML files, which are specially formatted
documents that can contain links, as well as images
and other media.
All web browsers can read HTML files.
In addition to HTML, it's common for websites to
use technologies like CSS (Cascading Style Sheets)
and JavaScript and Flash to do more advanced
things.
26. www
URL
To get to a webpage, you can type the URL
(Uniform Resource Locator) into a browser. The
URL, also known as the web address, tells the
browser exactly where to find the page.
However, most of the time, people get to a
webpage by following a link from a different page
or by searching for the page using a search engine.
27. History of the Internet
Before there was the public internet there was the
internet's forerunner ARPAnet or Advanced
Research Projects Agency Networks.
ARPAnet was funded by the United States military
after the cold war with the aim of having a military
command and control centre that could withstand
nuclear attack.
28. History of the Internet
The point was to distribute information between
geographically dispersed computers.
ARPAnet created the TCP/IP communications
standard, which defines data transfer on the
Internet today.
29. History of the Internet
The ARPAnet opened in 1969 and was quickly
usurped by civilian computer nerds who had now
found a way to share the few great computers that
existed at that time.
Father of the Internet Tim Berners-Lee
30. History of the Internet
Tim Berners-Lee was the man leading the
development of the World Wide Web (with help of
course), the defining of HTML (hypertext mark-up
language) used to create web pages, HTTP
(Hypertext Transfer Protocol) and URLs (Universal
Resource Locators).
All of those developments took place between 1989
and 1991.
31. History of the Internet
Tim Berners-Lee was born in London, England and
graduated in Physics from Oxford University in
1976.
He is currently the Director of the World Wide
Web Consortium, the group that sets technical
standards for the Web.
32. Did you know?
The foundation of the Internet began in 1969,
when the U.S. Department of Defence created
ARPAnet, a project to allow military personnel to
communicate with each other in an emergency.
By 2012, the number of Internet users worldwide
reached 2.4 billion—about one-third of the world's
population.
To store all of the information that's available on
the Internet, you would need more than 2 billion
DVDs or 500 million Blu-ray discs.
