1. Networking

2. Understanding Computer Networks
O A computer network is a collection of
computers, printers, and other devices
that are interconnected by communication
channels. Computer networks facilitate
communications among users and allow
users to share resources.

3. Advantages of Networks
O Sharing Resources,
O Security,
O Communication,
O Education,
O Project Management .

4. Drawbacks of Networks
O Installation and maintenance cost
O Viruses and trojan horses
O Network can be useless in the case
of a crashing server
O Identity theft
O Internet crimes

5. Network Types
O LAN (local area network)
O MAN (metropolitan area
network)
O WAN (wide area network)

6. LAN (Local Area Network)
Usually, if the devices on a network are in a
single location, such as a building or a
group of rooms, they are called a local area
network (LAN). LANs usually have all the
devices on the network connected by a
single type of network cable or wireless
connection.

7. MAN (Metropolitan Area Network)
A metropolitan area network (MAN)
interconnects users with computer
resources in a geographic area or
region larger than that covered by a
local area network (LAN) but smaller
than the area covered by a wide area
network (WAN).

8. MAN (Metropolitan Area Network)

9. WAN (Wide Area Network)
O If the devices are scattered
widely, such as in different buildings
or different cities, they are usually
set up into several LANs that are
joined together into a larger
structure called a wide area network
(WAN).

10. WAN (Wide Area Network)

11. Comparing LAN, MAN and WAN

12. Network
Components

13. Media
O The term network media refers to the
pathways along which data travel.
Network media is the actual path over
which an electrical signal travels as it
moves from one component to another. It
provides connections between the
network computers, peripherals, and
devices in the network.
O There are four types of media
technologies used in computer networks:

14. Coaxial cable

15. UTP (unshielded twisted pair)

16. Fiber Optic Cable

17. Wireless

18. Network Devices
O Computer networking devices
are units that mediate data in a
computer network. Computer
networking devices are also
called network equipment or
communication devices.

19. NIC (network interface card)

20. Bridge
O A bridge device filters data
traffic at a network boundary.
Bridges reduce the amount of
traffic on a LAN by dividing it
into two segments.

21. Switch
O A network switch is a small
hardware device that joins multiple
computers together within one local
area network (LAN).

22. Router
O When two or more networks
must be connected, a router is
usually necessary.