Networking Lesson 3

Networking Lesson 3
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Slide 1: Slide
ComputingLower Secondary (Key Stage 3)

This lesson contains 26 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

Networking Lesson 3

Slide 1 - Slide

Do Now:
Question 1: Explain the purpose of a network cable.
Question 2: Identify the advantage of using a hub in a network


Slide 2 - Open question

Oracy survey 
Complete the following student survey

This should take you around 5 Mins 

Slide 3 - Slide

Lesson 3: Computer networks 
Conquer: Compare wired to wireless connections and list examples of specific technologies.


Aspire: Define ‘bandwidth’, using the appropriate units for measuring the rate at which data is transmitted. 


Slide 4 - Slide

Wired and wireless data transmission
Wired and wireless data transmission

  • Wired networks send data along cables.

  • Wireless networks send data through the air using radio waves.


Slide 5 - Slide

Do you know any names of wireless technologies?

Slide 6 - Open question

Wireless technologies
Popular examples of wireless technologies are:
  • Bluetooth
  • WiFi
  • 3G (third generation wireless mobile)
  • 4G (fourth generation wireless mobile)
  • 5G(Fifth generation wireless mobile)

Slide 7 - Slide

Look at the image of the living room and the devices within it. Identify if the devices are connected to the network through wires or wirelessly.


Wireless
Wireless
Wired
Wireless

Slide 8 - Drag question

Bandwidth
  • Bandwidth is the amount of data that can be moved from one point to another in a given time. Higher bandwidth = more data per second

  • The greater your bandwidth the more devices you can have connected at the same time. 

  • Netflix would use a high amount of Bandwith while reading the school website would use a small amount. 

Slide 9 - Slide

How much Bandwith would the following activity use?
Reading a news article.
A
Light
B
Medium
C
High
D
None

Slide 10 - Quiz

How much Bandwith would the following use?

A vlogger uploading videos to YouTube daily
A
Light
B
Medium
C
High
D
None

Slide 11 - Quiz

How much Bandwith would the following use?

Using social media
A
Light
B
Medium
C
High
D
None

Slide 12 - Quiz

Which waves do wireless networks use to send data?
A
Infrared
B
Gamma
C
Radio
D
X-ray

Slide 13 - Quiz

Measuring bandwidth
  • Bandwidth is measured in bits per second.

  • Data transfer rates are now so good that bandwidth is usually measured in Megabits per second (Mbps)

Slide 14 - Slide

Which do you think has the highest bandwidth?
A
4G
B
3G
C
Bluetooth
D
5G

Slide 15 - Quiz

Bandwidth compared
The typical download speeds are:
  • 3G: 3 Mbps
  • 4G: 20 Mbps
  • Broadband: 46 Mbps

  • We have 2 kinds of speed, download speed and upload speed. 

Slide 16 - Slide

Upload speeds are always slower than download speeds.

Why might this be the case?

Slide 17 - Open question

Answer:
  • Internet service providers (ISPs) configure our connection based on the most popular activities.

  • Most users spend much more time downloading than they do uploading.

 

Slide 18 - Slide

Test the performance of the schools connection.
Enter your download speed
Enter your upload speed


Slide 19 - Open question

Research the minimum internet speeds required for these activities!
Streaming a film
Playing online games
Reading an email
Downloading an audio Book

Slide 20 - Open question

What does this symbol mean?

Slide 21 - Mind map

Answer: Buffering
  • Data is arriving at your device at a rate that is slower than it is being processed.
  • Example: when you are watching a film on Netflix and it pauses, and you have to wait for a period of time before it starts again


Slide 22 - Slide

Wired versus wireless
We know that a network can be wired or wireless

Slide 23 - Slide

Wired networks 
Advantage 
Disadvantage 
Faster connection (little to no interference)

Higher bandwidth

More expensive. 

time-consuming, each device needs cables

Slide 24 - Drag question

Wireless networks 
Advantage 
Disadvantage 
Can be weakened by walls and ceilings

Allows portability
 

Less secure


It is quick and cheap to connect new devices

Slide 25 - Drag question

Extension Mastery 
Continue your PowerPoint about the history of the internet. 
This should include the following information:
  1. When was the internet invented?
  2. Who invented the internet?
  3. How do people connect to the internet?
  4. How has the way people connect changed over the last 30 years?

Slide 26 - Slide