A directory of Objective Type Questions covering all the Computer Science subjects.

1.
Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?
a. CDMA
b. CDMA/CD
c. CDMA/CA
d. None of the above
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Answer: (c).CDMA/CA

2.
What is the size of MAC Address?
a. 16-bits
b. 32-bits
c. 48-bits
d. 64-bits
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Answer: (c).48-bits

3.
This is what happens if two devices on the same Ethernet network determine the network is free, but attempt to transmit data at exactly the same time.
a. overlap
b. crossover
c. collision
d. None of the above
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Answer: (c). collision

4.
This describes how the Ethernet protocol regulates communication among connection points.
a. Carrier Sense Multiple Access/Collision Detect
b. Discontinuous transmission
c. Aggregator
d. Wait and response
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Answer: (a).Carrier Sense Multiple Access/Collision Detect

5.
802.11 wireless networking uses what method as the media access method?
a. CSMA/CD
b. CTS/RTS
c. CSMA/CA
d. CSCD/CA
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Answer: (c).CSMA/CA

6.
____________ assigns a unique number to each IP network adapter called the MAC address.
a. Media Access Control
b. Metro Access Control
c. Metropolitan Access Control
d. Both b and c above
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Answer: (a).Media Access Control

7.
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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Answer: (a).pure ALOHA

8.
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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Answer: (b).two times

9.
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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Answer: (b).18.4

10.
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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Answer: (b).slotted ALOHA

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