The document outlines the components and creation of computer networks, including hardware like hubs, routers, and servers essential for networking. It describes different types of networks based on geography and architecture, such as PAN, LAN, WAN, and peer-to-peer vs. client-server architectures. Additionally, it explains network topologies and transmission channels, emphasizing wired and wireless data transmission methods.

1. 1
Computer Networks
L O : To create a simple computer network

2. Success Criteria
● To understand the meaning of a computer network
● To identify the components of a computer network
● To create a basic network
2

3. Computer Network
● Two or more computers linked together
is known as a computer network
● It is used for
– Electronic communication
– Sharing resources like printers and
exchanging files
3

4. 4
Discuss advantages and disadvantages of a computer
network

5. What is hardware?
Hardware is the term given to a
physical device that you can see and
touch.
For instance the monitor you are
watching this is a piece of hardware.
Credit: Pixabay
5

6. So what is networking
hardware?
The physical devices that are needed
in order to create a network.
Examples – hub, cable, router, server
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Credit: Pixabay

7. Network cable
Hub
Option 3 Router
Server
7
What am I?
Credit: Pixabay

8. Network cable
Hub
Option 3 Router
Server
8
What am I?
Credit: Pixabay

9. Network cable
Hub
Option 3 Router
Server
9
What am I?
Credit: Pixabay

10. Network cable
Hub
Option 3 Router
Server
10
What am I?
Credit: Pixabay

11. 11
What am I?
Credit: Pixabay
Network cable
Hub
Option 3 Router
Server

12. Network cable
Hub
Option 3 Router
Server
12
What am I?
Credit: Pixabay

13. Network cable
Hub
Option 3 Router
Server
13
What am I?
Credit: Pixabay

14. Network cable
Hub
Option 3 Router
Server
14
What am I?
Credit: Pixabay

15. Network cables
●To connect together different
devices, you need cables.
●They have plastic plugs that
connect into sockets on devices.
●The cable is made up of a number
of copper wires.
15
Credit: Pixabay

16. Task 1 part 1: Build a network - scenario 1
●A small company has 4 people
working for it with 4 computers.
●All of the computers need to be
networked together using cables so
that they can communicate.
●Task - Connect each computer to each
other computer using lines for cables.
16
Credit: Free stock photos

17. Task 1 part 1: Build a network - scenario 1
●This illustration shows how you
should have set the network up.
●All computers can communicate
with one another as they all have a
connection.
●Can you see a disadvantage for
this setup?
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Credit: Free stock photos

18. Task 1 part 1: Build a network - scenario 1
●This setup requires a lot of cabling.
●With more computers, this can
become unmanageable and
expensive.
●How many cables would be needed
for a room with 6 computers?
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Credit: Free stock photos

19. Task 1 part 2: Build a network - scenario 1
●15 separate cables would be
required to connect 6 computers.
●Imagine how complex it would be
for 20 computers!
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Credit: Free stock photos

20. Hub
●A hub connects a number of
computers together.
●Ports allow cables to be plugged in
from each connected computer.
●A message sent from computer A
to computer B travels via the hub.
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Credit: Pixabay

21. Task 2: Build a network - scenario 2
●The company wishes to install a
hub to reduce the overall number
of cables used to network the 4
computers.
●Connect the computers together
with the addition of a hub.
21
Credit: Free stock photos
?

22. ●The hub becomes the central
device in the network.
●All messages between the
computers will pass through the
hub.
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Credit: Computer: Free stock photos
Hub: Pixabay
Task 2: Build a network - scenario 2

23. Server
●Some networks will have a server.
●A server is a powerful computer which
provides services.
23
Credit: Needpix

24. Server
●There are many different types of
server, for example, a file server
which stores files (i.e. text, images,
sound, or video) that can be
accessed by all devices on the
network.
●You could also have servers for
mail and applications!
●Research work: Find out other
types of servers!
24
Credit: Needpix

25. ●The company network currently
looks like this.
●Imagine that computer A is turned
off.
●Can computer C access files that
are stored on computer A?
25
Credit: Computer: Free stock photos
Hub: Pixabay
A
D
B
C
Hub
Task 3: Build a network - scenario 3

26. ●The company wishes to install a file
server so that all 4 computers can
store their files in a central
location.
●Add a file server to network
diagram.
26
Credit: Computer: Free stock photos
Hub: Pixabay
A
D
B
C
Hub
?
Task 3: Build a network - scenario 3

27. ●A file server has been connected to
the hub.
●The personal computers are no
longer reliant on each other. All
files can be stored and accessed
centrally on the file server.
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Hub
Credit:
Computer: Free stock photos
Hub: Pixabay
Server: Needpix
Task 3: Build a network - scenario 3

28. Router
●When a network needs to be connected to another network over a
large area, a router is needed.
●A router forwards messages from one network to another.
●A common job of a router is to join a home network to the
internet via an internet service provider (ISP).

29. ●The company wants to connect its
network to the internet so that the
4 users can carry out internet
research on their computers via
the web.
●add a router and an ISP (an ISP is
normally represented by a cloud)
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Hub
Credit:
Computer: Free stock photos
Hub: Pixabay
Server: Needpix
Task 5: Build a network - scenario 4
ISP
connection to
the internet

30. ●The router is connected to the hub,
just as the file server was in the
previous scenario.
●All personal computers now have
access to the router.
●All personal computers can now
carry out research on the web via
the internet.
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Hub
Credit:
Computer: Free stock photos
Hub: Pixabay
Server: Needpix ISP
Task 5: Build a network - scenario 4

31. Activity
1. The company wants to create a network with 5 users. It should be connected to the
internet so that the users can carry out internet research on their computers via
the web. Create a simple network for this task.
2. A company wants to set up a network with 14 computers. A hub can connect 7
devices at a time. The network should have access to the internet. Create a
network configuration for the same.
3. A company wants to set up a network with 10 computers. The network should have
access to the internet and a shared file location. Create a network configuration for
the same.
31

32. 32
Lesson2
LO : To analyse different types of network
SC :
- To explain different types of network

33. Starter
● https://forms.office.com/r/TB4XK7ghzr
33

34. Types of network based on
geographical area
● PAN
● LAN
● WAN
● MAN
● Client server
● Peer to peer
34
Types of network based on
architecture
TASK: Create a poster/PowerPoint to
explain different types of network

35. PAN – Personal area
network
● It is a network for communication
among personal devices.
● Devices can be connected through
wires or wirelessly
● It covers very short distance of few
meters.
● Example :Bluetooth
● It covers limited geographical area of
few kilometers.
● It is controlled and managed by a
single person/organization.
● Devices connected wirelessly makes a
WLAN (Wi-fi)
● Example : Network within a school
35
LAN – Local area network

36. WAN – Wide area network
● It covers a large geographical area like
cities, countries, etc.
● Largest WAN - Internet
● Computers are interconnected within
the same geographical area.
● Example: Different branches of an
organization in a city.
● It spans larger than a LAN but smaller
than a WAN.
36
MAN – Metropolitan area
network

37. Client server architecture
37
Peer to peer architecture

38. Client server architecture
● Centralised network
● Server monitors all clients
● De centralized network
● All system has same responsibilities.
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Peer to peer architecture

39. 39
Lesson3
LO : To describe network topologies and
mobile OS
SC :
- To explain different types of network topologies
- To explain a mobile OS and its types

40. Network Topology
● The physical arrangement of a network
– Bus – all computers are connected to a single main cable
– Ring – all computers are connected to each other
– The system with a token will process at a time
– Star – all computers are connected to a hub or switch
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41. Identify the topologies.
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42. Mobile Operating Systems
● It is the operating systems used in smartphones, tablets and other devices.
– Example - iOS, Android
● Desktop OS – OS for desktop computers
– Example – Windows, Linux
● What can be the difference between desktop OS and mobile OS?
● https://www.cambridge.org/go/ereader/read/9781108948593/#book/2109?groupId
=0
42

43. Activity
● Which is your favourite OS? Why?
Make a poster/inforgraphic.
43

44. 44
Topic : Transmission channels
LO : To analyse different types of transmission channels

45. Transmission channels-It shows the way to transmit the data
There are two types of transmission channels:
● Wired
– Coaxial cable
– Twisted pair cable
● Wireless
– Radiowaves
– Bluetooth
– Infrared
45

46. Ethernet and Wifi
● LAN can be wired or wireless.
● Ethernet is a wired LAN
● Wi- fi(wireless fidelity) is wireless LAN
46

47. Activity
1. Compare wired LAN(Ethernet) with wireless LAN.
2. Create a poster/ PowerPoint to explain different types of transmission
channels
OR
3. Research Antivirus software
• What is the main purpose of antivirus software?
• Identify the key features of an antivirus software.
• How can antivirus software help protect a computer?
• How to use antivirus software effectively?
47