08 - WIFI - frequency and channels encryption

 1. Which of the following statements is true about WIFI?

  All of the above statements are true

  Wi-Fi compatible devices can connect to the Internet via a WLAN and a wireless access point.

  WiFi is a technology that uses radio waves to provide network connectivity

  A WiFi connection is established using a wireless adapter to create hotspots

 2. When you connect to a Wi-Fi hotspot at a cafe, a hotel, an airport lounge, or another public place, you're connecting to that business's wireless network
Wireless networking - which is often just known as Wi-Fi - is a way of getting broadband internet without wires



 3. One wireless hub is usually enough to enable you to connect to the internet in any room in your home, though the signal will be _________ the nearer the hub you are





 4. Many devices, such as smartphones come ready to accept Wi-Fi signals whilst others require buying a separate ?.

  encryption mechanism

  wireless card or adapter

  ISP (Internet service provider)

  network key

 5. There are two well known frequency bands available to use when setting up a WIFI network. 2.4 GHz and 5Ghz. 2.4GHz is?.

  the least popular frequency

  a type of frequency which is only used in African countries

  the most universally used frequency

  not in use anymore

 6. The waves in this radio frequency are about 5 inches long and can pass through walls, windows and others objects well and signals have a range up to about 100 metres

  None of the above

  5 GHz

  2.4 GHz

  1 GHz

 7. 5 GHz is less common. It has a wavelength of about 2.5 inches long and this suggests that it is?

  less capable of passing through objects and walls

  more capable of passing through walls than 2.4 GHz

  no longer in use

  invalid and defunct

 8. With 5 GHz ________ speeds can sometimes be achieved because it is less crowded/popular frequency.




  stationary (non moving)

 9. When setting up a wireless network, 2.4 GHz is compatible with standards for building a wireless network known as 802.11b and 802.11g.



 10. Radio waves can be bounced around by many things, including walls, mirrors, water and metal surfaces. This can cause ?.

  None of the above

  higher frequencies

  a spontaneous internet connection to appear

  interference and signal direction change

 11. Each frequency _____ is divided up in to ____________.

  signal / bands

  channel / bands

  band / channels

  band / sound waves

 12. The 2.4 GHz band has ____ channels.





 13. All the channels available in a band are always available at any given time and in any given location.



 14. The 5GHz frequency offers additional bandwidth over the 2.4GHz frequency



 15. The 5GHz frequency is capable of carrying more non-overlapping channels which will result in less interference.



 16. Wireless network security relies on a combination of ___________, authentication, and authorization to provide maximum protection for a WLAN.





 17. Encryption is a method of _____________data with a key code - the data must be decrypted to be made sense of.





 18. With encryption is the data is intercepted it will be vulnerable as if it is found, it will make sense, even without the key



 19. When you are using a secure site for example your bank, or purchasing on Amazon, encryption is applied to keep your details safe:



 20. The encryption method used on secure sites is called:

   'SSL' (Secure Socket Layer




 21. The general rule of thumb is that the lower the frequency, the longer the propagation and the _____ the penetration





 22. An example that helps you understand why low frequencies penetrate better is:

  the 'bass' (low frequency) notes of a song blasting through a wall - while the rest is not so loud

  A radio wave that can be heard if you are in a completely silent place

  A high pitched singer managing to shout loudly and fill a large hall

  the high frequency of a nightingale in song, would come through any thick wall

 23. Interference between channels can be undesirable but doesn't lead to a reduction in performance



 24. The benefit of wider channels is that more data can be transmitted, resulting in faster Wi-Fi speeds



 25. In most cases the router handles the channel width selection _______________

  None of the above

  manually - needing an individual to connect it each time


  by connecting to the internet