WCN interview Questions or viva Questions, bits4

UNIT-VII 1. The NBC "Red" network was made up of stations originally owned by:
A)    AT&T
B)    Westinghouse
C)    United Fruit
D)    General Electric Answer:  A 2. In ________ 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) Answer  A B  3. In 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  Answer: B 4.  The maximum throughput for pure ALOHA is ________ per cent. A)           12.2 B)           18.4 C)           36.8 D)           none of the above  Answer B    5.  In __________, 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)  Answer B 6. In 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  Answer A 7.  The maximum throughput for pure ALOHA is ________ per cent. A)           12.2 B)           18.4 C)           36.8 D)           none of the above  Answer C 8.  The vulnerable time for CSMA is the ________propagation time. A)           the same as B)           two times C)           three times D)           none of the above  Answer A 9.  In 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  Answer B 10.  In 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  Answer A 11.  In 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  Answer C 12. We have categorized access methods into _______ groups. A)           two B)           three C)           four D)           five  Answer B 13.  In ___________ 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  Answer A 14.  In ______, 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  Answer B 15.  ________ requires that each station first listen to the medium before sending. A)           MA B)           CSMA C)           FDMA D)           CDMA  Answer B 16.   __________ augments the CSMA algorithm to detect collision. A)           CSMA/CA B)           CSMA/CD C)           either (a) or (b) D)           both (a) and (b)  Answer B 17. 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 B 18.  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 A 19. 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 A 20. 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  Answer B                                             UNIT-VIII 1.  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 Answer B  2. We discussed ______ popular controlled-access methods. A)           two B)           three C)           four D)           none of the above  Answer B 3.  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  Answer A 4.  In 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  Answer A 5. 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  Answer B 6.  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  Answer B 7. In 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  Answer C 8.  In the _______ method, each station has a predecessor and a successor. A)           reservation B)           polling C)           token passing D)           none of the above  Answer C 9.  In 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  Answer C 10.   _________ 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  Answer C 11.  We discussed ________ channelization protocols. A)           two B)           three C)           four D)           none of the above  Answer B 32.  In ________, the available bandwidth is divided into frequency bands. A)           FDMA B)           TDMA C)           CDMA D)           none of the above  Answer A 13. 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                                                               Answer A   14.  In _______, the stations share the bandwidth of the channel in time. A)           FDMA B)           TDMA C)           CDMA D)           none of the above  Answer B 15. 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  Answer B 16.  In _____, each station transmits its data in its assigned time slot. A)           FDMA B)           TDMA C)           CDMA D)           none of the above  Answer B 17.  In ______, the stations use different codes to achieve multiple access. A)           FDMA B)            TDMA C)            CDMA D)           none of the above  Answer C 18.   _______ is based on coding theory and uses sequences of numbers called chips. A)           FDMA B)           TDMA C)           CDMA D)           none of the above  Answer C 19.  In _______, the sequences are generated using orthogonal codes such the Walsh tables. A)           FDMA B)           TDMA C)           CDMA D)           none of the above  Answer C

20.  What does Wireless Communication used for?

A) Transfer of radio signal

B)  Transfer of information over short distance

C)  Transfer of information over long distance

D)  Both (ii) and (iii)

Answer   D

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