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00:22 Types of Networks Based on Size
00:41 personal area network(PAN)
01:55 Local Area Network(LAN)
04:18 Metropolitan Area Network(MAN)
05:53 wide area network(WAN)
 Types of Networks Based on Size
Computer networks can be characterized by their sizes. The size of a network
can be expressed in terms of the geographic area the network occupies and the
number of computers connected to the network. Networks can cover anything
from a handful of devices within a single room to millions of devices spread
across the entire globe.
we classify networks by their rough physical size.
The smallest in size is the personal area networks (PAN), networks that are meant
for one person. Beyond PAN, with varying coverage range are categorized into
local, metropolitan and wide area networks, each with increasing scale.
 Personal Area Network (PAN)
A personal area network (PAN) is a computer network organized around an
individual person within a single building. A common example is a wireless
network that connects a computer with its peripherals. Almost every computer
has an attached monitor, keyboard, mouse and printer. If there is no wireless
network, this connection must be done with cables.
A network created by Bluetooth is PAN. Bluetooth is a short-range wireless
network used to connect computer’s peripheral components without wires
a laptop, a mobile phone and a television
or tables are connected to one another without a cable. The idea is that if your
devices have Bluetooth, then you need no cables.
This type of network provides a great flexibility. For example, it allows you to:
 Send a document to the printer in the office while you are sitting on the
couch with your laptop.
 Upload a photo from your cell phone to your desktop computer.
 Watch movies from an online streaming service to your TV.
 Local Area Network
Local Area Network (LAN) is generally an organizational or a privately owned
network within a single office, building or campus covering a distance of a few
kilometers. The main reason for designing a LAN is to share resources such
as storage spaces, printers, programs and data. It also enables the exchange of
information.
The smallest LAN may use only two computers while larger LANs can
accommodate thousands of computers. A LAN typically relies mostly on wired
connections for increased speed and security, but wireless connections can also
be part of a LAN. If a LAN is entirely wireless, it is referred to as a wireless
local area network (WLAN).
 Metropolitan Area Network
A Metropolitan Area Network (MAN) is a network that is designed to cover an
entire city. Suppose a bank wants to connect three of its branches in a given city.
In such a case, the bank will utilize the service of existing telephone network
of the city (for example the Ethio-telecom network) to interconnect its offices,
through which MAN is created. Figure 2.14 shows a MAN that interconnects a
hospital, a school/collage and a factory local area network.
 Wide Area Network
A wide area network (WAN) occupies a very large area such as an entire country
or the entire world. A WAN can contain multiple smaller networks such as LANs
or MANs. The Internet is the best-known example of a public WAN.