Computer Networks

371. In a token ring, the stations are connected to the ____________

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

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372. In analog systems, bandwidth is expressed as the difference between the

1. Highest frequency
2. Lowest frequency
3. Both a & b
4. None of these

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373. In binary phase shift keying, the case of 4 different phase shifts, where each symbol represents ____________ , the modulation technique is called quadrature PSK(QPSK)

1. 2 bits
2. 4 bits
3. 8 bits
4. 16 bits

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374. In binary phase shift keying, the case of 8 different phase shifts, where each symbol represents ____________ , the modulation technique is called

1. QPSK
2. 8PSK
3. 8QAM
4. 8FSK

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375. In broadcast network ,the routing problem is ____________ , so the network layer is often thin or even nonexistent

1. Complex
2. Simple
3. Both a & b
4. None of these

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376. In case of PSTN, signaling between

1. A telephone user
2. The telephone network
3. Both a & b
4. None of these

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377. In case of satellite communication two different frequencies are used as carrier frequency to avoid interference b/w incoming and outgoing signals are

1. Uplink frequency
2. Downlink frequency
3. Both a & b
4. None of these

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378. In CDMA system ,all user transmit in the ____________ bandwidth simultaneously

1. Different
2. Same
3. Both a & b
4. None of these

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379. In cell relay communication performed between

1. Two VP
2. Two VC
3. VP and VC
4. VP and VCI

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380. In cell relay these logical channels are represented as

1. Virtual Channels(VCs)
2. Virtual Paths(VPs)
3. Both a & b
4. None of these

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