CCNA DISCOVERY 1

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CCNA DISCOVERY 1

• CHAPTER 7
• WIRELESS TECHNOLOGIES

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1. What do wireless technologies use to carry
information between devices?

• Electromagnetic waves

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2. What are the most common wave lengths used for
public wireless communication?

• Infrared (IR)
• Radio Frequency (RF)

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

• IR

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4. Which wavelength has the greatest range?

• RF

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5. What ranges can be used with very few
restrictions?

• 900 MHz, 2.4 GHZ, 5 GHz

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6. What are the ranges with the fewest
restrictions called?

• Industrial, Scientific, and Medical (ISM)

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7. What has made Bluetooth technology the
preferred method for connection computer
peripherals?

• One-to-many communications

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8. What is one of the main advantages of wireless
technology?

• The ability to provide anytime, anywhere
  connectivity

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9. What is a hotspot?

• The implementation of wireless in public
  locations

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10. What are the benefits of wireless LAN
technology?

• Mobility
• Scalability
• Flexibility
• Cost savings
• Reduced installation time
• Reliability in harsh environments

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11. What are the limitations of wireless LAN
technology?

• Interference
• Network and data security
• Technology

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11. What two techniques have been developed to
help secure wireless transmissions?

• Encryption and authentication

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12. What are the three major categories of
wireless networks?

• WPAN Wireless Personal Area Network
• WLAN Wireless Local Area Network
• WWAN Wireless Wide Area Network

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13. What is the smallest wireless network, which
is used to connect various peripheral devices?

• WPAN

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14. What does an access point do?

• Provides a connection between wireless hosts and
  hosts on an Ethernet wired network

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15. What technologies does the WWAN use?

• Code Division Multiple Access (CDMA) or Global
  System for Mobile Communications (GSM)

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16. What is a good example of a WWAN?

• Cell phone network

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17. What do wireless standards ensure?

• Specify the RF spectrum used, data rates, and how
  the information is transmitted

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18. What is the main organization responsible for
the creation of wireless technical standards?

• IEEE

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19. What IEEE standard governs the WLAN
environment?

• 802.11

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20. What are the current standards for the WLAN
environment?

• 802.11a, 802.11b, 802.11g, 802.11n

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21. What organization is responsible for testing
wireless LAN devices from different
manufacturers?

• WI-FI Alliance

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22. What does the Wi-Fi logo on a device mean?

• The equipment meets standards and should
  interoperate with other devices of the same
  standard

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23. What is a STA?

• A wireless client/station

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24. What do antennas do?

• increase output signal strength from a wireless
  device
• receives wireless signals from other devices

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25. What is an increase in signal strength from
an antenna known as?

• gain

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26. How are antenna classified?

• According to the way they radiate the signal

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27. 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

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28. Which antenna type can achieve greater
transmission distances?

• directional

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29. How do you ensure that wireless components
connect to the appropriate WLAN?

• SSID Service Set Identifier

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

• SSID

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31. What is the SSID used for?

• To tell wireless devices which LAN they belong to
  and with which other devices they can communicate

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32. What are the two basic forms of WLAN
installations?

• Ad hoc
• Infrastructure mode

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33. What is the simplest form of a wireless
network?

• Ad-hoc

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34. How is an ad-hoc network created?

• Connecting two or more wireless clients together
  in a peer-to-peer network

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35. What is the mode of wireless communication
most often used in the home and business
environment?

• Infrastructure

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36. What controls all communications and ensures
that all STAs have equal access to the media on
infrastructure mode?

• Access Point

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37. What is the area covered by a single access
point known as?

• Basic Service Set (BSS)

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38. What is the smallest building block of a
WLAN?

• BSS

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39. What is an Extended Service Set (ESS)?

• Multiple access points in separate BSS

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40. In order to allow movement between the cells
without the loss of signal, how much must BSSs
overlap?

• 10

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41. How are the conversations between sender and
receiver controlled?

• Through channels

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42. What does Wireless technology use to avoid
collisions?

• CSMA/CA Carrier Sense Multiple access with
  Collision Avoidance

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43. What is a CTS (Clear to Send)?

• A message indicating that the device may transmit
  on the channel

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44. What is an ACK (acknowledgement)?

• A transmission control character that confirms a
  transmitted message was received uncorrupted or
  without errors or that the receiving station is
  ready to accept transmissions

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45. Who receives the ACK?

• All devices within the BSS

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46. When should basic configuration tasks be
conducted?

• Before the access point is connected to a live
  network

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47. What does the type of mode enabled on the
access point depend on?

• The type of host connecting to it

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48. What happens if you select mixed mode?

• Network performance will decrease

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49. What must adjacent BSSs use in order to
optimize throughput?

• Non-overlapping channels

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50. What is a wireless host?

• Any device that contains a wireless NIC and
  wireless client software

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51. What is basic management software that can
control most wireless client configurations?

• Windows XP wireless client software

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52. What are some of the features available with
stand-alone wireless utility software?

• Link information, profiles, site survey

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53. Is it possible for wireless utility software
and Windows XP client software to manage the
wireless connection at the same time

• YES or NO

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54. What feature displays the current signal
strength and quality of the wireless signal?

• Link information

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55. What is one of the most common tests for
verifying successful data transmission?

• Ping

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56. What does a successful ping tell you?

• Data transmission is possible

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57. What is one of the primary benefits of
wireless networking?

• Ease and convenience of connecting devices

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58. What is one easy way to gain entry to a
wireless network?

• Through the network name or SSID

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59. How can you make the network non-public?

• Turn off the SSID broadcast feature

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60. Why should you change the default settings?

• So that attackers cannot identify and infiltrate
  the network

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61. What is one way to limit access to your
wireless network?

• Control exactly which devices can gain access to
  your network

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62. What is MAC address filtering?

• Using the MAC address to identify which devices
  are allowed to connect to the wireless network

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63. What happens if the MAC address is not
located in the database?

• The device will not be allowed to connect to or
  communicate across the wireless network

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64. What is authentication?

• The process of permitting entry to a network
  based on a set of credentials

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65. What is the most common form of
authentication?

• The use of a username and password

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66. What are the three types of wireless
authentication methods?

• open authentication
• PSK
• EAP

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67. What is open authentication?

• All clients are able to associate

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68. What is PSK (pre-shared key) authentication?

• One-way authentication both the access point and
  client must be configured with the same key or
  secret word

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69. What is EAP (Extensible Authentication
Protocol)?

• Two-way authentication as well as user
  authentication

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70. If MAC address filtering and authentication
are enabled, which occurs first?

• authentication

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71. What is encryption?

• The process of transferring data so that even if
  it is intercepted, it is unusable

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72. What is WEP (Wired Equivalency Protocol)?

• An advanced security feature that encrypts
  network traffic as it travels through the air

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73. How big is the WEP key?

• 64 or 128 bits

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74. What is a passphrase?

• An easy way to remember the word or phrase to
  automatically generate a key

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75. How is WPA (Wi-Fi Protected Access) different
than WEP?

• WPA generates a new, dynamic key each time a
  client establishes a connection with the access
  point

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76. Why is WPA considered more secure than WEP?

• It is more difficult to crack

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77. What is traffic filtering?

• Blocks undesirable traffic from entering or
  leaving the wireless network

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78. What things should be included when planning
a network installation?

• The type of wireless standard to be used
• The most efficient layout of devices
• An installation and security plan
• S strategy for backing up and updating the
  firmware for the wireless device

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79. What are the most common factors to consider
when determining which WLAN standards to use?

• Bandwidth requirements, coverage areas, existing
  implementation, and cost

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80. What is the best way to learn end- user
requirements?

• Ask questions

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81. Which wireless standard supports a larger
BBS?

• 802.11 b/g/n

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82. What is a benefit of a larger BBS?

• Less equipment and a lower cost of implementation

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83. What is Total Cost of Ownership (TCO)?

• The purchase of the equipment as well as
  installation and support costs

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84. What are some of the more basic security
measures?

• Change default values for the SSID
• Disable broadcast SSID
• Configure MAC address filtering

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85. What are the two ways to restore factory
defaults?

• Select restore factory defaults from appropriate
  menu
• Press and hold the reset button for 30 seconds

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86. Where is the operating system on most
integrated routers stored?

• In firmware

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87. If the update process is interrupted before
completion, what happens to the drive?

• It may become inoperable

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88. What is the process of updating firmware on
an integrated router?

• Determine the version of the currently installed
  firmware
• Download the updated version of the firmware
• Select firmware upgrade feature in GUI