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)

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

4.Which wavelength has the greatest range? RF

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

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

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

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

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

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

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

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

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

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

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

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

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

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

20.What IEEE standard governs the WLAN environment?

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

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

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

24.Complete the Common IEEE WLAN Standards Chart

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

46.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

47.Who receives the ACK? All devices within the BSS

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48.When should basic configuration tasks be conducted? Before the access point is connected to a live network

49.What does the type of mode enabled on the access point depend on? The type of host connecting to it

50.What happens if you select mixed mode? Network performance will decrease

51.What must adjacent BSSs use in order to optimize throughput? Non-overlapping channels

52.What is a wireless host? Any device that contains a wireless NIC and wireless client software

53.What is basic management software that can control most wireless client configurations? Windows XP wireless client software

54.What are some of the features available with stand- alone wireless utility software? Link information, profiles, site survey

55.Is it possible for wireless utility software and Windows XP client software to manage the wireless connection at the same time YES or NO

56.What feature displays the current signal strength and quality of the wireless signal? Link information

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

58.What does a successful ping tell you? Data transmission is possible

59.What is one of the primary benefits of wireless networking? Ease and convenience of connecting devices

60.What is one easy way to gain entry to a wireless network? Through the network name or SSID

61.How can you make the network non-public? Turn off the SSID broadcast feature

62.Why should you change the default settings? So that attackers cannot identify and infiltrate the network

63.What is one way to limit access to your wireless network? Control exactly which devices can gain access to your network

64.What is MAC address filtering? Using the MAC address to identify which devices are allowed to connect to the wireless network

65.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

66.What is authentication? The process of permitting entry to a network based on a set of credentials

67.What is the most common form of authentication? The use of a username and password

68.What are the three types of wireless authentication methods? open authentication PSK EAP

69.What is open authentication? All clients are able to associate

70.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

71.What is EAP (Extensible Authentication Protocol)? Two-way authentication as well as user authentication

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

73.What is encryption? The process of transferring data so that even if it is intercepted, it is unusable

74.What is WEP (Wired Equivalency Protocol)? An advanced security feature that encrypts network traffic as it travels through the air

75.How big is the WEP key? 64 or 128 bits

76.What is a passphrase? An easy way to remember the word or phrase to automatically generate a key

77.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

78.Why is WPA considered more secure than WEP? It is more difficult to crack

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79.What is traffic filtering? Blocks undesirable traffic from entering or leaving the wireless network

80.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 a strategy for backing up and updating the firmware for the wireless device

81.What are the most common factors to consider when determining which WLAN standards to use? Bandwidth requirements, coverage areas, existing implementation, and cost

82.What is the best way to learn end- user requirements? Ask questions

83.Which wireless standard supports a larger BBS? b/g/n

84.What is a benefit of a larger BBS? Less equipment and a lower cost of implementation

85.What is Total Cost of Ownership (TCO)? The purchase of the equipment as well as installation and support costs

86.What are some of the more basic security measures? change default values for the SSID disable broadcast SSID configure MAC address filtering

87.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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88.Where is the operating system on most integrated routers stored? In firmware

89.If the update process is interrupted before completion, what happens to the drive? It may become inoperable

90.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

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