Deck 9: Wireless Technologies

Question 1

All devices that conform to the 802.11b standard must be able to transmit at 6, 12, and 24 Mbps.

Answer 1

False

Question 2

Wireless technologies are now more reliable than ever.

Answer 2

True

Question 3

A(n)transceiver is a device that sends out and picks up radio waves.

Answer 3

False

Question 4

It is a commonly accepted practice to combine both an IBSS and an ESS network in the same proximity.

Question 5

____ technologies are typically used for short distance communications with in an office, a building, or between buildings.

A)Radio
B)Infrared
C)Microwave
D)Both A and B.

Question 6

On a wireless network, moving a laptop from cell to cell is an example of roaming.

Question 7

Infrared is susceptible to interference from EMI.

Question 8

Radio waves, infrared, x-rays, and microwaves are all forms of electromagnetic radiation .

Question 9

The ESS topology does not use access points.

Question 10

A(n)watt represents a radiated alternating current or emission of one cycle per second.

Question 11

A line-of-sight transmission is one in which the signal bounces off the atmosphere to skip across the country or across continents.

Question 12

Network applications use lower frequencies than local radio station broadcasts.

Question 13

The current practical maximum distance for 802.11b devices is about 100 feet.

Question 14

The 802.11g standard is an extension of the 802.11a standard and enables data transfer rates up to 54 Mbps in the 2.4 GHz range.

Question 15

Transmission latency of LEO satellites is much lower than for regular satellite transmissions.

Question 16

Satellite microwave is the most expensive type of microwave networking.

Question 17

You would probably use ____ technologies to send network transmissions across continents via satellite communications.

A)Radio
B)Infrared
C)Microwave
D)Both B and C.

Question 18

A broadcast range is also called a(n)band .

Question 19

Priority-based access is intended for communications that are time-sensitive.

Question 20

In terrestrial microwave , the signal is transmitted between two directional parabolic antennas.

Question 21

Within the 802.11 standard, the priority-based access method is a ____ layer function.

A)Physical
B)Data Link Transport
C)Session
D)Transport

Question 22

The W in WLANA stands for ____.

A)Wide
B)Windows
C)Wireless
D)Working

Question 23

A ____ transmission follow the surface of the earth.

A)point-to-point
B)line-of sight
C)surface-to-point
D)LEO

Question 24

Which is not true about the 802.11 standard?

A)802.11 devices are proprietary.
B)It includes support for network management services.
C)It includes support for network authentication.
D)None of the above.

Question 25

Hams are not licensed to transmit ____ signals over radio waves and microwaves.

A)video
B)satellite
C)Morse code
D)None of the above.

Question 26

Within the 802.11 standard, the CSMA/CA access method is a ____ layer function.

A)Physical
B)Data Link Transport
C)Session
D)Transport

Question 27

Hams are licensed by the ____.

A)IEEE
B)FTC
C)FCC
D)ITU

Question 28

A TNC is associated with ____.

A)SWAP technology
B)IBSS technology
C)packet radio
D)IAPP

Question 29

An access point may not have which type of network interface?

A)AUI
B)10BaseT
C)FDDI
D)None of the above.

Question 30

The figure above shows an example of ____ antennas.

A)point-to-point
B)line-of-sight
C)directional
D)omnidirectional

Question 31

802.11a communications use the ____ band.

A)902 MHz
B)2.4 GHz
C)5 GHz
D)8.2 GHz

Question 32

____ technologies offer the potential to one day create a global area network that reaches all around the world.

A)LEO satellites
B)Infrared
C)Microwave
D)None of the above.

Question 33

In ____ access, the access point device also functions as a point coordinator.

A)CSMA/CA
B)distributed
C)priority-based
D)point

Question 34

Which is not a benefit of radio wave communications compared to other wireless options?

A)It is relatively inexpensive to install.
B)It is relatively easy to install.
C)Speeds are extremely fast.
D)None of the above.

Question 35

The 802.11 standard does not focus on the OSI ____ layer.

A)Physical
B)Data Link
C)Network
D)None of the above.

Question 36

CSMA/CA is also called the ____ function.

A)point-to-point
B)distributed coordination
C)point coordination
D)multiple point

Question 37

____ are the range of frequencies above 20 kilohertz through which an electromagnetic signal can be radiated into space.

A)Infrared frequencies
B)Radio frequencies
C)Wireless frequencies
D)Spectrum frequencies

Question 38

Amplification of the radiated signal is called ____.

A)strength
B)gain
C)bandrate
D)throughput

Question 39

Which is not a main component involved with the 802.11 standard?

A)a WNIC
B)access points
C)antennas
D)a band

Question 40

Most wireless radio wave technology network equipment employs ____ technology for packet transmissions.

A)line-of-sight
B)SWAP
C)DSSS
D)spread spectrum

Question 41

The M in CSMA stands for ____.

A)Multiple
B)Many
C)Modulation
D)Microwave

Question 42

Which is not true?

A)Microwave is expensive to install and maintain.
B)Microwave signals are hard to tap.
C)Microwave transmissions can be interrupted by rain.
D)Microwave transmissions can be interrupted by EMI.

Question 43

____ is a wireless networking specification that uses frequency hopping within the 2.4 GHz band.

A)Bluetooth
B)DES
C)HiperLAN
D)HomeRF SWAP

Question 44

Which is not a disadvantage of infrared?

A)Data transmission rates only reach up to 16 Mbps for directional communications and they are less than 1 Mbps for omnidirectional communications.
B)It does not go through walls.
C)In can experience interference from strong light sources.
D)None of the above.

Question 45

An access point is usually a bridge.

Question 46

One function of the authentication process is disconnecting when a communication session is complete.

Question 47

The ____ standard uses OFDM.

A)802.11a
B)802.11b
C)802.11g
D)Both A and B.

Question 48

You most likely use 802.11b devices ____.

A)for data-oriented transmissions
B)when a large amount of bandwidth is required
C)when there are many individual users in a small area, such as in a computer lab
D)All of the above.

Question 49

OFDM is performed at the ____ layer of the OSI model.

A)Physical
B)Data Link
C)Session
D)Transport

Question 50

Which is not an advantage of 802.11a over 802.11b?

A)It offers faster speeds.
B)It has a longer range.
C)It has a greater total available frequency range.
D)None of the above.

Question 51

Typically it costs more to implement 802.11a than 802.11b.

Question 52

____ originated in Europe and can transmit at up to 54 Mbps in the 5 GHz range.

A)Bluetooth
B)DES
C)HiperLAN
D)HomeRF SWAP

Question 53

An omnidirectional antenna can strengthen the radiated signal to a greater degree than a directional antenna.

Question 54

In radio network transmissions, a signal is transmitted in only one direction.

Question 55

The figure above is an example of ____ wireless topology.

A)IBSS
B)ESS
C)IAPP
D)DES

Question 56

____ is not an alternative to IEEE 802.11 for radio wave communications.

A)Bluetooth
B)DES
C)HiperLAN
D)HomeRF SWAP

Question 57

Infrared technologies are more popular than radio wave technologies.

Question 58

When an ESS wireless topology employs two or more access points, it becomes a ____ LAN.

A)multi-point wireless
B)multiple-cell wireless
C)LEO wireless
D)independent access wireless

Question 59

The figure above is an example of ____ wireless topology.

A)IBSS
B)ESS
C)IAPP
D)DES

Question 60

HomeRF SWAP does not ____.

A)function at the 2.4 GHz frequency range
B)provide network speeds of up to 10 Mbps
C)use CSMA/CA in a fashion similar to 802.11
D)None of the above.

Question 61

The ____________________ wireless specification supports DES, QoS, and operates in both the direct and centralized modes.

Question 62

List and briefly define the kinds of communications involved with the 802.11 standard.

Question 63

The Point-to-Point protocol enables roaming wireless networking communications.

Question 64

A(n)____________________ is a device that attaches to a cables network and that services wireless communications between WNICs and the cabled network.

Question 65

____________________ is the main unit of measurement for a radio frequency.

Question 66

____________________ technology uses one or more adjoining frequencies to transmit the signal across greater bandwidth.

Question 67

The peak optical transmission power for the 802.11R standard is 3 watts.

Question 68

What is TDD, and which wireless networking specification uses it?

Question 69

List two advantages and two disadvantages of radio wave communications.

Question 70

The informal beginning of wireless networking is in ____________________.

Question 71

List three types of needs for which wireless networks are designed and installed.

Question 72

The communication method used by the 802.11R standard is _________________________.

Question 73

Infrared is an electromagnetic signal, just as a radio wave is an electromagnetic signal.

Question 74

What is open system authentication?

Question 75

What does CSMA/CA stand for? Briefly describe what it is.

Question 76

Give three reasons why wireless technologies are attracting strong interest.

Question 77

What is shared key authentication?

Question 78

LEO stands for ____________________.

Question 79

The figure above illustrates a wireless network using ____________________ antennas.

Question 80

In wireless networking, the broadcast area around an access point is called a(n)____________________.