Computer Networks

411. In QPSK, the four angle are usually out of phase by

1. 0
2. 45
3. 90
4. 180

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412. In RZ, zero between each bit signifies a ____________

1. Rest Condition
2. Neutral Point
3. Both a & b
4. None of these

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413. In SMDS , the telephone number consists of

1. Country code
2. Area code
3. Subscriber code
4. All of these

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414. In SMDS, MAN interconnect

1. Ethernet
2. Token ring networks
3. Both a & b
4. None of these

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415. In SMDS, the service follows

1. IEEE 802.6 DQDB(Distributed Queue Dual Bus)
2. IEEE 802.5 DQDB(Distributed Queue Dual Bus)
3. IEEE 802.4 DQDB(Distributed Queue Dual Bus)
4. IEEE 803.6 DQDB(Distributed Queue Dual Bus)

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416. In SMDS, there are two useful security features, namely

1. Source address validation
2. Address screening
3. Both a & b
4. None of these

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417. In SMDS, with a tick every 10msec user can send ____________ on the average

1. 100,000 bytes/sec
2. 10,000 bytes/sec
3. 100,0000 bytes/sec
4. 100,000,00 bytes/sec

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418. In spread spectrum technique, a receiver is only capable of selecting the desired signal if it has the knowledge about the code of the intended

1. Receiver
2. Transmitter
3. Both a & b
4. Signal

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419. In stop and wait protocol

1. Sequence number are required
2. Sequence number are not required
3. Both a & b
4. None of these

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420. In telephone system as we know that a voice with bandwidth of approximately ____________ modulates the current of a telephone line

1. 2kHz
2. 3 kHz
3. 4 kHz
4. 5 kHz

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