Deck 6: Multiple Access Techniques and Wireless Network Management

Question 1

In ________, a station monitors the medium after it sends a frame to see if the transmission was successful. If so, the station is finished. If, however, there is a collision, the frame is sent again.

A)csma/ca
B)csma/cd
C)either (a) or (b)
D)both (a) and (b)

Answer 1

csma/cd

Question 2

To avoid collisions on wireless networks, ________was invented.

A)csma/ca
B)csma/cd
C)either (a) or (b)
D)both (a) and (b)

Answer 2

csma/ca

Question 3

In _______, collisions are avoided through the use of three strategies: the interframe space, the contention window, and acknowledgments.

A)csma/ca
B)csma/cd
C)either (a) or (b)
D)both (a) and (b)

Answer 3

csma/ca

Question 4

In _______ methods, the stations consult one another to find which station has the right to send.

A)random access
B)controlled access
C)channelization
D)none of the above

Question 5

In _______ methods, a station cannot send unless it has been authorized by other stations.

A)random access
B)controlled access
C)channelization
D)none of the above

Question 6

In the ________ method, a station needs to make a reservation before sending data. Time is divided into intervals.

A)reservation
B)polling
C)token passing
D)none of the above

Question 7

In the ______ method, all data exchanges must be made through the primary device even when the ultimate destination is a secondary device.

A)reservation
B)polling
C)token passing
D)none of the above

Question 8

In the _______ method, the primary device controls the link; the secondary devices follow its instructions.

A)reservation
B)polling
C)token passing
D)none of the above

Question 9

In ______, each station is allocated a band to send its data. In other words, each band is reserved for a specific station, and it belongs to the station all the time.

A)fdma
B)tdma
C)cdma
D)none of the above

Question 10

In _______, the stations share the bandwidth of the channel in time.

A)fdma
B)tdma
C)cdma
D)none of the above

Question 11

In _____, each station is allocated a time slot during which it can send data. Each station transmits its data in its assigned time slot.

A)fdma
B)tdma
C)cdma
D)none of the above

Question 12

In _____, each station transmits its data in its assigned time slot.

A)fdma
B)tdma
C)cdma
D)none of the above

Question 13

W-CDMA is ____.

A)wireless code division multiple access
B)wideband code division multiple access
C)wide code division multiple access
D)web band code division multiple access

Question 14

You have 5 information signals and only one transmitter. What technique will help in transmitting all the 5 signals?

A)frequency modulation
B)multiplexing
C)amplification
D)amplitude modulation

Question 15

RTS/CTS period is called ( )

A)waiting period
B)contention period
C)running period
D)none of these

Question 16

Which is not a variant of S-MAC?

A)timeout mac (tmac)
B)dynamic sensor mac (dsmac)
C)input-output mac (iomac)
D)data gathering (dmac)

Question 17

Fading of the received radio signals in a mobile communication environment occurs because of .....

A)direct propagation
B)multipath propagation
C)bi-path propagation
D)none of the above

Question 18

In .............. Frequency Spectrum is divided into smaller spectra and is allocated to each user.

A)tdma
B)cdma
C)fdma
D)fgma

Question 19

In ................ multiple access is achieved by allocating different time slots for the different users.

A)tdma
B)cdma
C)fdma
D)fgma

Question 20

A antenna which attempts to direct all its energy in a particular direction is called as a .............

A)directional antenna
B)one to one antenna
C)propagation antenna
D)single direction antenna

Question 21

Which of the FCC's RF bands operates in the frequency range of 2.4 GHz to 2.4835 GHz

A)ism
B)rfid
C)soho
D)unii

Question 22

What is the term used to identify the broadcast or generated electrical signals that can disrupt wireless communications?

A)rfi
B)rfid
C)fcc
D)ism

Question 23

Which one of the following devices rebroadcasts the signals it receives after conditioning them for increased strength and clarity?

A)bridge
B)repeater
C)router
D)gateway

Question 24

Wireless networks transmit using RF signals, which require a __________ to receive and transmit signals through the air.

A)repeater
B)router
C)antenna
D)remote

Question 25

Which one of the following RF band is allocated to the Industrial, Scientific and Medical industry?

A)4.9 ghz to 5.825 ghz
B)824 mhz to 849 mhz
C)174 mhz to 220 mhz
D)2.4 ghz to 2.4835 ghz