A network connects two or more computers allowing them to communicate and share resources. Common networks include home, school, office and wireless networks. Networks can be local area networks (LANs) within a building or wide area networks (WANs) spanning multiple locations. Components needed to set up a basic network include network interface cards for each computer, network cables to connect them, and a switch to allow communication between multiple computers on the LAN. Larger networks may use servers to provide shared resources and routers to connect LANs into WANs with an internet connection provided by an Internet Service Provider.

1. What is a network?

2. Two or more interconnected
computers.

3. An office
network

4. A school
network

5. A home network

6. A network is useful for communication
between computers, and for sharing
resources

7. Communicating Sharing
Chatting Sharing a printer
Video conferencing Sharing storage
Sending e-mail Sharing Files
Playing games Internet connection

8. Types of networks

9. LAN
Local Area Network

10. Local Area Network
On a small area, e.g: within one building

11. Wide Area Network

12. How to make a
network?
Networking equipment

14. Network Interface Card

16. Network
Cable

17. Now they can communicate

18. But what if I have three
computers?

19. Switch

20. Switch
workstation
workstation
workstation
workstation

21. A
B
C
D
E
Switch
back
If workstation B wants to
communicate with workstation C

23. A WAN is made up of several connected LANs
Wide Area Network

24. It can also be a group of several WANs, or
some LANs and some WANs
WAN

25. The Internet is the largest
WAN in the world

26. How are LANs connected
to make a WAN ?

27. LAN
LAN
LAN
WAN

28. Computers and devices
on a network

29. Clients & Servers
• It is called a Client, because it receives services
from a Server
• A Server is normally a powerful computer, that
provides services to other computers and
devices on a network

30. Examples of servers
Type Service
Printer server Allows clients to print using one shared printer
Storage server Allows clients to save/store their files on a shared drive
Web server Hosts the web-pages, that are accessed by the clients
Mail server Stores clients mail accounts and inboxes. Allows clients to
send email.

31. Storage server
Printer server
Giovanni Nick Steve
Brian James
Carola

32. • A firewall protects your network against
unwanted access.

33. • A firewall can be a hardware device and it can
be software that is installed on a computer or a
server.

34. How do you connect your network
to the Internet?

35. 1. Router 2. ISP
The Internet Service Provider, is a company,
that has a very large connection to the
Internet.
Switch
WAN
WAN
LAN

36. Other types of networks

37. LAN
Wireless Local Area Network

38. Bluetooth network
Personal Area Network