1. Introduction to computer networks
Term1
Introduction to computer networks

2. How two friends can communicate with each other nowadays?

3. Network

4. Describe how networks are used in real life (home, school, work)
Lesson1 Objectives:
Describe how networks are used in real life (home, school, work)
Explain cyber security
Describe the different types of hackers
Discuss advantages and disadvantages of computer networks.
Use real life scenarios.
Explain LANs and WANs.
Discuss network topologies

5. What is a Network?
A network is a group of interconnected things. You have seen a lot of networks in real life (Road Network – Rail network)

6. Activity 1 – Page 12

7. What is a Computer Network?
A computer network is a group of computers and other devices that are connected using cables or radio signals.

9. Class Activity
In groups,, Create a poster displaying Advantages and drawbacks of computer networks ?
Benefits
Drawbacks
Easy to communicate
No work done if the network goes down
Can work from anywhere
Hacking
Easy to share information
Cost of Network devices
Easy to share resources
Easier for viruses to spread
Cheaper computer programs
Easy to manage computers
Easier to backup files

10. Activity 2 – Page 16 Case Study One person can view Slower in delivery
Can be affected by virus
Data can be lost
Can be shared by all followers
Fast to upload and share

11. Cyber Security - Hackers
Black Hat Hackers illegally access computers to steal information , cause damage to computer system or can be involved in espionage.
White Hat Hackers used by companies to hack their systems to find out the weaknesses in their systems

12. Cyber Security
Cyber security – Ethical Hacking is designed to protect computer systems theft, damage and disruption.

13. Cyber Security – UAE law
The UAE has clear and strict laws against cybercrimes, with various penalties that can include lengthy prison terms and fines of up to Dh3 million.
UAE Cybercrime Law No. 5 of 2012, which was issued by the President, His Highness Shaikh Khalifa bin Zayed Al Nahyan, includes a range of violations and penalties, with fines ranging between Dh50,000 and Dh3 million depending on the type and severity of offence.

14. Activity 3 – Page 18
Identify type of hackers?

15. Types of Computer Networks
Study the three types of the computer in your group and present the different types in a poster ?
You will be supplied by A3 paper – Marker –wool -glue?

16. LAN – Local Area Network
Types of Computer Networks
LAN – Local Area Network
Internet
WAN – Wide Area Network

17. LAN (Local Area Network):
A local area networks (LAN) are small computer network in a small area. The area can be a house, school or a building

18. WAN (Wide Area Network):
Bigger networks that connect LANs and cover bigger areas such as an Emirate or the whole UAE are called wide area networks, WANs.

19. Internet
The Internet is a global network connecting computers around the world. Used for :
Searching
Massaging
Playing games
Watching videos

20. Activity 4 & 5– Pages
Identify type of networks?

21. Introduction to Cisco Packet Tracer 25-32
Cisco Packet Tracer is a program which will help you to make networks on a computers.

22. Network Topology
Network topology is how devices and cables are connected in a network

23. Network Topology This unit, you will learn about 3 network topologies:
Star Topology
Ring Topology
Bus Topology

24. Network topology Definition Benefits Drawbacks
The computers and switch are connected in a star shape
It is easy to add other computers to the network.
If one computer breaks, the other computers are not affected.
If the switch breaks, the whole network will break down.
Expensive to set up (costly)
Computers are connected in a ring.
It is easy to find problems in the network.
Data should pass through every computer in the network. This makes it slower.
If one computer fails, the whole network will fail.
The computers are connected to one long cable called a bus.
It works best with small networks.
It is cheap and easy to set up.
Not good for large networks. The more in the devices network, the slower it is.
It is hard to find out where the problem is if the network breaks down.
Network topology
Star Topology
Ring Topology
Bus Topology