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Multiple Choice Quiz
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Please answer all questions.




1In ________ each station sends a frame whenever it has a frame to send.
A)pure ALOHA
B)slotted ALOHA
C)both (a) and (b)
D)neither (a) nor (b)



2In pure ALOHA, the vulnerable time is ______ the frame transmission time.
A)the same as
B)two times
C)three times
D)none of the above



3The maximum throughput for pure ALOHA is ________ per cent.
A)12.2
B)18.4
C)36.8
D)none of the above



4In __________, each station is forced to send only at the beginning of the time slot.
A)pure ALOHA
B)slotted ALOHA
C)both (a) and (b)
D)neither (a) nor (b)



5In slotted ALOHA, the vulnerable time is ______ the frame transmission time.
A)the same as
B)two times
C)three times
D)none of the above



6The maximum throughput for pure ALOHA is ________ per cent.
A)12.2
B)18.4
C)36.8
D)none of the above



7The vulnerable time for CSMA is the ________propagation time.
A)the same as
B)two times
C)three times
D)none of the above



8In the _________ method, after the station finds the line idle, it sends its frame immediately. If the line is not idle, it continuously senses the line until it finds it idle.
A)nonpersistent
B)1-persistent
C)p-persistent
D)none of the above



9In the ________method, a station that has a frame to send senses the line. If the line is idle, it sends immediately. If the line is not idle, it waits a random amount of time and then senses the line again.
A)nonpersistent
B)1-persistent
C)p-persistent
D)none of the above



10In the _______method, after the station finds the line idle it sends or refrain from sending based on the outcome of a random number generator. If the line is busy, it tries again.
A)nonpersistent
B)1-persistent
C)p-persistent
D)none of the above



11We have categorized access methods into _______ groups.
A)two
B)three
C)four
D)five



12In ___________ methods, no station is superior to another station and none is assigned the control over another.
A)random access
B)controlled access
C)channelization
D)none of the above



13In ______, the chance of collision can be reduced if a station senses the medium before trying to use it.
A)MA
B)CSMA
C)FDMA
D)CDMA



14________ requires that each station first listen to the medium before sending.
A)MA
B)CSMA
C)FDMA
D)CDMA



15__________ augments the CSMA algorithm to detect collision.
A)CSMA/CA
B)CSMA/CD
C)either (a) or (b)
D)both (a) and (b)



16In ________, 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)



17To avoid collisions on wireless networks, ________was invented.
A)CSMA/CA
B)CSMA/CD
C)either (a) or (b)
D)both (a) and (b)



18In _______, 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)



19In _______ 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



20In _______ 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



21We discussed ______ popular controlled-access methods.
A)two
B)three
C)four
D)none of the above



22In 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



23In the _____ method, time is divided into intervals. In each interval, a reservation frame precedes the data frames sent in that interval.
A)reservation
B)polling
C)token passing
D)none of the above



24In 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



25In 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



26In the _______ method, the stations in a network are organized in a logical ring.
A)reservation
B)polling
C)token passing
D)none of the above



27In the _______ method, each station has a predecessor and a successor.
A)reservation
B)polling
C)token passing
D)none of the above



28In the _________ method, a special packet called a ______ circulates through the ring.
A)reservation: control frame
B)polling: poll request
C)token passing: token
D)none of the above



29_________ is a multiple-access method in which the available bandwidth of a link is shared in time, frequency, or through code, between different stations.
A)Random access
B)Controlled access
C)Channelization
D)none of the above



30We discussed ________ channelization protocols.
A)two
B)three
C)four
D)none of the above



31In ________, the available bandwidth is divided into frequency bands.
A)FDMA
B)TDMA
C)CDMA
D)none of the above



32In ______, 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



33In _______, the stations share the bandwidth of the channel in time.
A)FDMA
B)TDMA
C)CDMA
D)none of the above



34In _____, 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



35In _____, each station transmits its data in its assigned time slot.
A)FDMA
B)TDMA
C)CDMA
D)none of the above



36In ______, the stations use different codes to achieve multiple access.
A)FDMA
B)TDMA
C)CDMA
D)none of the above



37_______ is based on coding theory and uses sequences of numbers called chips.
A)FDMA
B)TDMA
C)CDMA
D)none of the above



38In _______, the sequences are generated using orthogonal codes such the Walsh tables.
A)FDMA
B)TDMA
C)CDMA
D)none of the above







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