Computer Networks

721. The disadvantage of stop and wait protocol is

1. Error free communication channel does not exist
2. Acknowledgement may get lost
3. Deadlock situation may occur
4. All of these

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722. The disadvantages associated with the Delta Modulation PCM is

1. Slope overload
2. Granular noise
3. Both a & b
4. None of these

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723. The disadvantages of FM are

1. Much more bandwidth(as much as 20 times as much)
2. More Complicated receiver
3. More complicated transmitter
4. All of these

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724. The disadvantages of mobile communication are

1. Fixed network needed for the base stations
2. Handover(changing from one cell to another) necessary
3. Interference with other cells such as co-channel, adjacent-channel
4. All of these

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725. The DQDB supports ____________ based on cell switching technology similar to Asynchronous Transfer Mode(ATM)

1. Data
2. Voice
3. Video transmission
4. All of these

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726. The dynamic information is the ____________ area of the mobile subscriber which is the identity of the currently serving VLR

1. Last location
2. First location
3. Current location
4. None of these

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727. The dynamic range is the ratio of the

1. Largest possible signal magnitude
2. Smallest possible signal magnitude
3. Both a & b
4. None of these

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728. The effective throughput is more in the range of ____________ per hub

1. 1 to 2 Mbps
2. 2 to 3 Mbps
3. 3 to 4 Mbps
4. 4 to 5 Mbps

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729. The eight burst period are grouped into a TDMA frame which forms the basic unit for definition of

1. Physical channel
2. Logical channel
3. Both a & b
4. None of these

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730. The entities comprising the corresponding layers on different computers are called ____________ which communicate by using layer protocol

1. Peer
2. Layer protocol
3. Network
4. None of these

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