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| 1 | |
In the _______ random-access method collision is avoided. |
| | A) | CSMA/CD |
| | B) | CSMA/CA |
| | C) | ALOHA |
| | D) | token-passing |
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| 2 | |
In the 1-persistent approach, when a station finds an idle line, it _______. |
| | A) | sends immediately |
| | B) | waits 0.1 s before sending |
| | C) | waits 1 s before sending |
| | D) | waits a time equal to 1 − p seconds before sending |
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| 3 | |
_______ requires one primary station and one or more secondary stations. |
| | A) | Token ring |
| | B) | Reservation |
| | C) | Polling |
| | D) | CSMA |
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| 4 | |
In the p-persistent approach, when a station finds an idle line, it _______. |
| | A) | sends immediately |
| | B) | waits 1 s before sending |
| | C) | sends with probability 1 − p |
| | D) | sends with probability p |
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| 5 | |
The 1-persistent approach can be considered a special case of the p-persistent approach with p equal to _______. |
| | A) | 1.0 |
| | B) | 2.0 |
| | C) | 0.1 |
| | D) | 0.5 |
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| 6 | |
In the reservation access method, if there are 10 stations on a network, then there are _______ reservation minislots in the reservation frame. |
| | A) | 10 |
| | B) | 11 |
| | C) | 5 |
| | D) | 9 |
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| 7 | |
_______ is a controlled-access protocol. |
| | A) | FDMA |
| | B) | TDMA |
| | C) | CSMA |
| | D) | Reservation |
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| 8 | |
_______ is (are) a channelization protocol. |
| | A) | FDMA |
| | B) | TDMA |
| | C) | CDMA |
| | D) | All the choices are correct |
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| 9 | |
In the _______ random-access method, stations do not sense the medium. |
| | A) | CSMA/CA |
| | B) | ALOHA |
| | C) | CSMA/CD |
| | D) | Ethernet |
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| 10 | |
Which of the following is an example of a random-access protocol? |
| | A) | Polling |
| | B) | FDMA |
| | C) | Token passing |
| | D) | None of the choices are correct |
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| 11 | |
Which of the following is an example of a controlled-access protocol? |
| | A) | CDMA |
| | B) | FDMA |
| | C) | Token passing |
| | D) | None of the choices are correct |
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| 12 | |
The vulnerable time for a pure ALOHA is __________ the one for slotted ALOHA. |
| | A) | less than |
| | B) | greater than |
| | C) | equal to |
| | D) | None of the choices are correct |
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| 13 | |
The vulnerable time for CSMA is ___________. |
| | A) | Tp |
| | B) | 2 x Tp |
| | C) | 3 x Tp |
| | D) | None of the choices are correct |
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| 14 | |
We need RTS and CTS packets in ____________ protocol. |
| | A) | CDMA/CA |
| | B) | CDMA/CD |
| | C) | token-passing |
| | D) | None of the choices are correct |
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| 15 | |
In FDMA, we use different ___________ to achieve channelization. |
| | A) | frequency ranges |
| | B) | time slots |
| | C) | codes |
| | D) | None of the choices are correct. |
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| 16 | |
In CDMA, we use different ___________ to achieve channelization. |
| | A) | frequency ranges |
| | B) | time slots |
| | C) | codes |
| | D) | None of the choices are correct |
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| 17 | |
In TDMA, we use different ___________ to achieve channelization. |
| | A) | frequency ranges |
| | B) | time slots |
| | C) | codes |
| | D) | None of the choices are correct |
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| 18 | |
Walsh tables are used in _________________. |
| | A) | FDMA |
| | B) | TDMA |
| | C) | CDMA |
| | D) | None of the choices are correct |
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