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Networking Lesson 3
Networking Lesson 3
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Slide 1:
Slide
Computing
Lower Secondary (Key Stage 3)
This lesson contains
24 slides
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interactive quizzes
and
text slides
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Lesson duration is:
50 min
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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
Lesson 2: 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 3 - 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 4 - Slide
Do you know any names of wireless technologies?
Slide 5 - 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 6 - 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 7 - 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 8 - Slide
How much Bandwith would the following activity use?
Reading a news article.
A
Light
B
Medium
C
High
Slide 9 - Quiz
How much Bandwith would the following use?
A vlogger uploading videos to YouTube daily
A
Light
B
Medium
C
High
Slide 10 - Quiz
How much Bandwith would the following use?
Using social media
A
Light
B
Medium
C
High
Slide 11 - Quiz
Which waves do wireless networks use to send data?
A
Infrared
B
Gamma
C
Radio
D
X-ray
Slide 12 - 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 13 - Slide
Which do you think has the highest bandwidth?
A
4G
B
3G
C
Bluetooth
D
5G
Slide 14 - 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 15 - Slide
Upload speeds are always slower than download speeds.
Why might this be the case?
Slide 16 - 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 17 - Slide
Test the performance of the schools connection.
Look at your download speed
Look at your upload speed
Speed Test
https://www.broadbandspeedchecker.co.uk/?&again
Slide 18 - 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 19 - Open question
What does this symbol mean?
Slide 20 - 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 21 - Slide
Wired versus wireless
We know that a network can be wired or wireless
Slide 22 - Slide
Wired networks
Advantage
Disadvantage
Faster connection (little to no interference)
Higher bandwidth
More expensive.
time-consuming, each device needs cables
Slide 23 - 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 24 - Drag question
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