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| 1 | 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) |
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| 2 | 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 |
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| 3 | The maximum throughput for pure ALOHA is ________ per cent. |
| A) | 12.2 |
| B) | 18.4 |
| C) | 36.8 |
| D) | none of the above |
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| 4 | 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) |
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| 5 | 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 |
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| 6 | The maximum throughput for pure ALOHA is ________ per cent. |
| A) | 12.2 |
| B) | 18.4 |
| C) | 36.8 |
| D) | none of the above |
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| 7 | The vulnerable time for CSMA is the ________propagation time. |
| A) | the same as |
| B) | two times |
| C) | three times |
| D) | none of the above |
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| 8 | 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 |
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| 9 | 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 |
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| 10 | 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 |
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| 11 | We have categorized access methods into _______ groups. |
| A) | two |
| B) | three |
| C) | four |
| D) | five |
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| 12 | 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 |
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| 13 | 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 |
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| 14 | ________ requires that each station first listen to the medium before sending. |
| A) | MA |
| B) | CSMA |
| C) | FDMA |
| D) | CDMA |
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| 15 | __________ augments the CSMA algorithm to detect collision. |
| A) | CSMA/CA |
| B) | CSMA/CD |
| C) | either (a) or (b) |
| D) | both (a) and (b) |
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| 16 | 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) |
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| 17 | To avoid collisions on wireless networks, ________was invented. |
| A) | CSMA/CA |
| B) | CSMA/CD |
| C) | either (a) or (b) |
| D) | both (a) and (b) |
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| 18 | 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) |
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| 19 | 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 |
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| 20 | 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 |
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| 21 | We discussed ______ popular controlled-access methods. |
| A) | two |
| B) | three |
| C) | four |
| D) | none of the above |
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| 22 | 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 |
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| 23 | 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 |
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| 24 | 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 |
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| 25 | 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 |
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| 26 | 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 |
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| 27 | In the _______ method, each station has a predecessor and a successor. |
| A) | reservation |
| B) | polling |
| C) | token passing |
| D) | none of the above |
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| 28 | 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 |
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| 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 |
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| 30 | We discussed ________ channelization protocols. |
| A) | two |
| B) | three |
| C) | four |
| D) | none of the above |
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| 31 | In ________, the available bandwidth is divided into frequency bands. |
| A) | FDMA |
| B) | TDMA |
| C) | CDMA |
| D) | none of the above |
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| 32 | 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 |
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| 33 | In _______, the stations share the bandwidth of the channel in time. |
| A) | FDMA |
| B) | TDMA |
| C) | CDMA |
| D) | none of the above |
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| 34 | 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 |
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| 35 | In _____, each station transmits its data in its assigned time slot. |
| A) | FDMA |
| B) | TDMA |
| C) | CDMA |
| D) | none of the above |
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| 36 | In ______, the stations use different codes to achieve multiple access. |
| A) | FDMA |
| B) | TDMA |
| C) | CDMA |
| D) | none of the above |
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| 37 | _______ is based on coding theory and uses sequences of numbers called chips. |
| A) | FDMA |
| B) | TDMA |
| C) | CDMA |
| D) | none of the above |
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| 38 | In _______, the sequences are generated using orthogonal codes such the Walsh tables. |
| A) | FDMA |
| B) | TDMA |
| C) | CDMA |
| D) | none of the above |