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CCNA DISCOVERY 1

CCNA DISCOVERY 1. MODULE 7 – WIRELESS TECHNOLOGIES. 1. What do wireless technologies use to carry information between devices? . Electromagnetic waves. 2. What are the most common wave lengths used for public wireless communication? . Infrared (IR) Radio Frequency (RF).

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CCNA DISCOVERY 1

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  1. CCNA DISCOVERY 1 • MODULE 7 – WIRELESS TECHNOLOGIES

  2. 1. What do wireless technologies use to carry information between devices? • Electromagnetic waves

  3. 2. What are the most common wave lengths used for public wireless communication? • Infrared (IR) • Radio Frequency (RF)

  4. 3. Which wavelength is relatively low energy and cannot penetrate through walls or other obstacles? • IR

  5. 4. Which wavelength has the greatest range? • RF

  6. 5. What ranges can be used with very few restrictions? • 900 MHz, 2.4 GHZ, 5 GHz

  7. 6. What are the ranges with the fewest restrictions called? • Industrial, Scientific, and Medical (ISM)

  8. 7. What has made Bluetooth technology the preferred method for connection computer peripherals? • One-to-many communications

  9. 7.1.1.4 Activity

  10. 8. What is one of the main advantages of wireless technology? • The ability to provide anytime, anywhere connectivity

  11. 9. What is a hotspot? • The implementation of wireless in public locations

  12. 10. What are the benefits of wireless LAN technology? • Mobility • Scalability • Flexibility • cost savings • reduce installation time • reliability in harsh environments

  13. 11. What are the limitations of wireless LAN technology? • Interference • network and data security • technology

  14. 12. What two techniques have been developed to help secure wireless transmissions? • Encryption and authentication

  15. 13. What are the three major categories of wireless networks? • WPAN – Wireless Personal Area Network • WLAN – Wireless Local Area Network • WWAN – Wireless Wide Area Network

  16. 14. What is the smallest wireless network, which is used to connect various peripheral devices? • WPAN

  17. 15. What does an access point do? • Provides a connection between wireless hosts and hosts on an Ethernet wired network

  18. 16. What technologies does the WWAN use? • Code Division Multiple Access (CDMA) or Global System for Mobile Communications (GSM)

  19. 17. What is a good example of a WWAN? • Cell phone network

  20. 7.1.3.3 Activity

  21. 18. What do wireless standards ensure? • Specify the RF spectrum used, data rates, and how the information is transmitted

  22. 19. What is the main organization responsible for the creation of wireless technical standards? • IEEE

  23. 20. What IEEE standard governs the WLAN environment? • 802.11

  24. 21. What are the current standards for the WLAN environment? • 802.11a, 802.11b, 802.11g, 802.11n

  25. 22. What organization is responsible for testing wireless LAN devices from different manufacturers? • WI-FI Alliance

  26. 23. What does the Wi-Fi logo on a device mean? • The equipment meets standards and should interoperate with other devices of the same standard

  27. 24. Complete the Common IEEE WLAN Standards Chart

  28. 25. What is a STA? • A wireless client/station

  29. 26. What do antennas do? • increase output signal strength from a wireless device • receives wireless signals from other devices

  30. 27. What is an increase in signal strength from an antenna known as? • gain

  31. 28. How are antenna classified? • According to the way they radiate the signal

  32. 29. What is the difference between a directional antenna and an omni-directional antenna? • Directional antenna concentrate signal strength in one direction; omni-directional emit equally in all directions

  33. 30. Which antenna type can achieve greater transmission distances? • directional

  34. 7.2.2.3 Activity

  35. 31. How do you ensure that wireless components connect to the appropriate WLAN? • SSID – Service Set Identifier

  36. 32. What is a case-sensitive, alpha-numeric string that can be up to 32 characters? • SSID

  37. 33. What is the SSID used for? • To tell wireless devices which LAN they belong to and with which other devices they can communicate

  38. 34. What are the two basic forms of WLAN installations? • Ad hoc • Infrastructure mode

  39. 35. What is the simplest form of a wireless network? • Ad-hoc

  40. 36. How is an ad-hoc network created? • Connecting two or more wireless clients together in a peer-to-peer network

  41. 37. What is the mode of wireless communication most often used in the home and business environment? • Infrastructure

  42. 38. What controls all communications and ensures that all STAs have equal access to the media on infrastructure mode? • Access Point

  43. 39. What is the area covered by a single access point known as? • Basic Service Set (BSS)

  44. 40. What is the smallest building block of a WLAN? • BSS

  45. 41. What is an Extended Service Set (ESS)? • Multiple access points in separate BSS

  46. 42. In order to allow movement between the cells without the loss of signal, how much must BSS’s overlap? • 10%

  47. 7.2.3.4 Activity

  48. 43. How are the conversations between sender and receiver controlled? • Through channels

  49. 44. What does Wireless technology use to avoid collisions? • CSMA/CA – Carrier Sense Multiple access with Collision Avoidance

  50. 45. What is a CTS (Clear to Send)? • A message indicating that the device may transmit on the channel

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