The document discusses key concepts related to how information is transmitted over the internet. It defines the internet as a global network of interconnected networks that uses standardized protocols to provide communication and information. It explains that domain names are human-friendly addresses that point to numeric IP addresses, which identify the location of websites and other resources. It also defines data packets as the basic units of digital communication, describing how data is broken into packets that are transmitted independently and reassembled at their destination. Finally, it states that packet switching is a transmission method where messages are broken into packets that are sent over optimal routes and reassembled at the destination.

1. Packets, routers and
IP addresses
Definition of Internet –
a global computer network that provides
a large variety of information and
communication facilities, consisting of
interconnected networks using
standardized communication protocols.

2. State the link between domain
names and IP addresses
A domain name is similar to an address is a forwarding service. The
domain name is the address people type in their web browser to get to
your web site. The domain name then points to the “actual" address that
contains your web site. The “actual" address is called the IP address and is
a series of numbers, such as 123.23.234.45. This IP address then points to
the location on the server that contains your web site files.

3. What is a data packet?
A packet is a basic unit of communication over a
digital network. A packet is also called a datagram, a
segment, a block, a cell or a frame, depending on
the protocol. When data has to be transmitted, it is
broken down into similar structures of data, which
are reassembled to the original data chunk once they
reach their destination.

4. What is packet switching?
Packet Switching is a mode of data transmission in which
a message is broken into a number of parts which are
sent independently, over whatever route is optimum for
each packet, and reassembled at the destination.

5. References to Sources
https://www.google.co.uk/#q=definition+of+
the+internet
http://www.cyberindian.com/domain-registration/
article.php?article_id=72
http://voip.about.com/od/glossary/g/Packet
Def.htm
https://www.google.co.uk/#q=what+is+pack
et+switching