Computer Networks

631. The 5B/6B scheme encodes the scrambled 5-bit data pattern into predetermined ____________ bit symbol

1. 5
2. 4
3. 6
4. 3

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632. The 802.2 compatible interfaces provide two major types of services, which are

1. Unacknowledged
2. Connectionless
3. Both a & b
4. None of these

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633. The ABM mode is suitable only to ____________ environment

1. Point
2. Point-to-point
3. First-to-end-point
4. None of these

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634. The access methods and protocols for GSM may be from

1. X.25
2. X.32
3. Both a & b
4. None of these

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635. The actual bandwidth of graded index multimode fibre depends on

1. How well a particular fibre’s index profile minimizes model dispersion
2. The wavelength of light launched into the fibre
3. Both a & b
4. None of these

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636. The actual cell is the ____________ hexagon, with the towers at the corners

1. Red
2. Blue
3. Red and blue
4. None of these

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637. The actual range of frequencies supporting a given communication is known as

1. Baud rate
2. Pass band
3. Band data
4. Pass

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638. The advantage of Token ring mechanism is

1. It prevents collision by ensuring that only one station at a time is transmitting
2. Ensures delivery of frame
3. Both a & b
4. None of these

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639. The advantage of X.25 are

1. Was developed to recover errors
2. Packet switching eases compatibility problems in communications between PCs
3. Packet switching cannot waste bandwidth
4. All of these

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640. The advantages of coaxial cable include high bandwidth in the range of ____________ and more, better error performance and lack of severe distance limitation

1. 200MHz
2. 300MHz
3. 400MHz
4. 500MHz

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