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01 - Introduction to WIFI

 1. What is Wi-Fi? 
The famous actress in the picture is Hedy Lamarr.
Hedy Lamarr and WIFI? There's an interesting link
that those of you who are interested may want to
research more about.
hedylemmar_wifi.jpg

  Infrared pulsed networking

  A USB stick containing the Internet

  Data transmitted via radio in Morse code

  Radio wireless local area networking

 2. What is the international technical standard for Wi-Fi?

  ICHEME 500.44

  IEEE 802.11

  ICE 700.1

  ICR 300.5

 3. The word 'Wi-Fi' was invented for marketing purposes to sound like 'hi-fi'.

  FALSE

  TRUE

 4. Wi-Fi connects two or more devices using …

  fibre optic cable

  wireless communication

  infrared pulses

  sonar technology

 5. Wi-Fi uses UHF and SHF radio bands. What do these abbreviations stand for?

  ultra high frequency and super high frequency

  ultra heavy frequency and super heavy frequency

  ultimate high frequency and superlative high frequency

  under high frequency and sub high frequency

 6. To connect to a Wi-Fi network, a device must have a …

  wireless network adapter

  Ethernet port

  graphics card

  USB port

 7. The device can then connect to a …

  network gate

  wireless access point

  Wi-Fi enabler

  cellular phone mast

 8. To reduce interference, Wi-Fi networks 'listen' to avoid sending data at the same time as another transmitter.

  TRUE

  FALSE

 9. Which of these options are advantages of Wi-Fi? 
1. It is always free to use.
2. Users do not have to connect to the network using a cable.
3. Multiple users can connect to the network.
4. The Internet can be accessed on the go.
5. It is always at least a 100 times faster than any wired connection. 
6. It is more secure than a wired connection.
wifihotspot.jpg

  1, 2, 3, 4 and 5

  All of these options

  2, 3, and 4

  1, 2, 3, and 6

 10. Which of these options are disadvantages of Wi-Fi? 
1. The operational range is limited.
2. The signal will be affected by physical obstacles (e.g. walls). 
3. Other equipment sharing the same frequency band (e.g. microwave ovens) can cause interference.
4. It is generally slower than a wired connection. 
5. It is vulnerable to unauthorised access and attacks.
6. The data transfer rate decreases as the number of computers connected increases.

  2, 3, 4 and 5

  All of these options

  1, 2, 3 and 6

  1, 2, 3, 4 and 5


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