1. 1.5 Network topologies, protocols and layers

2. Lesson 1 What is a network? Networking Topologies
Be familiar with and can explain the need for computer networks
Describe network topologies in particular start & mesh
Identify obvious strengths and weaknesses of these topologies

3. What is a computer network?
A computer network is 2 or more computer devices connected together.
Benefits of this include:
Sharing folders & files
Sharing devices such as printers
Using s to communicate
Control user accounts centrally
Distributing software to all devices from central device

4. What is a LAN?
Video copyright of OCR - all rights reserver.

5. Can you think of any examples of LAN's? Where can we find them?

6. Networking Topologies
Networks can come in different layouts or topologies.
Three common ones are:
Has one central cable which devices connect to.
Obvious issues with this?
Central device send data to others.
What happens if central device breaks?
Devices are chained together, data is sent to each device until it gets to it target.
Comes in lots of different formats, machines are interlinked.

7. Why do we network computers? Disadvantages/Drawbacks
Student Task - 2 slides
Why do we network computers?
Advantages/Benefits
Disadvantages/Drawbacks

8. Topologies Pros: Pros: Cons: Cons: Description: Description: Name:

9. End of Lesson Q & A

10. Lesson 2 Networking Hardware
The hardware needed to connect stand-alone computers into a Local Area Network:
wireless access points
routers/switches
NIC (Network Interface Controller/Card)
transmission media

11. What is a computer network? Q & A about previous lesson

12. Network Interface Card
Router
Network Interface Card
Switch
Wireless Access Point
Hub
Explain and describe to the

13. Network Interface Card
Student Task - 2 slides
Router
Network Interface Card
Description
What does it do?
Description
What does it do?
Image of example
Image of example

14. Wireless Access Point Switch
Description
What does it do?
Description
What does it do?
Image of example
Image of example
What is the difference between a hub and a switch?

15. Networking Cable Types
You are going to split into 2 teams and be given a short amount of time to research the difference between copper cables and fibre optic cables.
After this time we will have a class debate, the aim of which is to defend your given cable type and discredit the other.
You have been provided with some websites to start off your research.

16. Link to end of lesson Kahoot Quiz
Networking Cable Types
Link to end of lesson Kahoot Quiz
(Requires Account)

17. Lesson 3 P2P & Client-Server

18. Networking Cable Types
You are going to split into 2 teams and be given a short amount of time to research the difference between copper cables and fibre optic cables.
After this time we will have a class debate, the aim of which is to defend your given cable type and discredit the other.
You have been provided with some websites to start off your research.

19. Networking Cable Types
Watch & make notes about:
What does P2P stand for?
Describe client-server
Pro’s & Con’s of each

20. Student Paired/Group Work
Working in groups as instructed by your teacher you need to prepare a 6 minute presentation about P2P and Client-Server networks.
Key Questions to cover:
Explain the term client-server
Explain how a client-server network functions
What is the function of the client within a network
Explain the term P2P
Give two types of devices/resources which can be shared on a P2P network
Give 3 advantages and 3 disadvantages of using peer-to-peer networks.
P2P networks and connections are usually throttled by internet providers, find out:
What does the term “throttled connection” mean?
Why do they throttle P2P traffic? Why do they have a bad reputation?
Presentation Ideas
Paper based - multiple large sheets of paper
Powtoon
Prezi
Pear Deck
Video Screen recording using something like paint
PowerPoint
Google Slides
This a research task for students, they can work in groups of 2 or 3 at teacher discretion.
Give students a choice on how to present this.

21. End of Lesson Quiz
Click this link to complete a short quiz to check your understand of today’s lesson.

22. Homework

23. Lesson 4 The Internet & WAN’s
Understand the difference between the internet & the WWW
Acknowledge that the internet a worldwide collection of connected networks
Understand the uses of IP & MAC Addressing
Describe what is meant by:
DNS

24. Watch the video & complete the WAN missing words activity

25. Go through the answers as a class

26. The Internet - Intro to protocols
Internet Address Protocol
All computers and servers connected to the internet use IP to communicate.
Each device on the internet must have its own unique IP address.

27. That bloke from Top Gear(Before they ruined it)

28. How Does DNS work then?

29. MAC Address
It is a unique identifier that is assigned to your network interfaces.
This simply means that it’s an identifier for your hardware.
It is absolutely unique and it will be assigned by the manufacturers of a device.
It simply is a label for your device.

30. Packets
When two devices want to communicate across a LAN one device will send a message to the other.
This message is broken into smaller chunks called packets.
These packets are broadcast onto the LAN with the MAC address of the destination device. The destination device will see all of the traffic on the LAN but will only pick up the packets with its own MAC address on them.
It’s a bit like getting your luggage back after a flight – you watch all the bags go around on the conveyer belt but you only pick up the one with your name on the label.

31. Packet switching in depth
You send a 3MB file across the internet, we know it is broken up into small chunks called “packets”.
Each packet has a “header which contains the following info:
IP address it is going to
IP it was sent from
The sequence number ( i.e 2nd packet )
How many packets in total

32. Student Task Explain the purpose of an IP address
Explain the purpose of an MAC address
When data is sent from one computer to another across the internet, the data is split into packets.
Give 4 items that will be included in each packet in addition to the data itself.
Where would these 4 items be stored within the packet?

33. Student Task: Add definitions for the words shown below

34. Lesson 5 VPN, Hosting & Cloud
the internet as a worldwide collection of computer networks:
DNS (Domain Name Server)
hosting
the cloud
the concept of virtual networks.

35. What is a virtual network?

36. How do you make a website? Is it as simple as you think????
Web Hosting
How do you make a website?
Is it as simple as you think????
Hosting involves storing files and data that you want to make available for access from computers connected to the internet.
Websites pages, images and related files
Online file hosting - OneDrive, ICloud and others
Video hosting such as Youtube
Web hosting comes in lots of formats both paid and unpaid services.

37. Student Task
Paid and unpaid web hosting services - research online the benefits of paying for web hosting over getting it for free.
Things to consider:
Which companies offer hosting - find examples
How much do they charge?
What do you get? Do they all offer similar services for a similar price
What's the downside of choosing a free option?
Can you host your own website? If yes what is required?

38. Cloud Storage: Who has heard of any of these?
Class discussion with students leading using their existing knowledge.

39. Student Task: CLoud Storage
Tadcastle Senior School has an ageing teaching staff who have a limited understanding of technology, teachers create all of their lesson resources on computers and save these files onto USB memory sticks. However these memory sticks are regularly lost meaning the work has to be redone as it is not backed up, the school's new Head of ICT Mr Bingle has convinced the technicians to invest in cloud storage for all staff.
Create a poster that will convince and explain to staff why they should either stop using USB memory sticks or at least back them up online. You will need to include a little info explaining what cloud storage is.
Use a blank slide in this document
Google Drawing which can be accessed here

40. Homework