Computer Networks

741. The FDMA channel are further divided in time with a burst period of approximately ____________ using a TDMA technique

1. 0.277ms
2. 0.377ms
3. 0.477ms
4. 0.577ms

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742. The FDMA involves the division up to the maximum of ____________ bandwidth into 124 carrier frequencies spaced 200 kHz apart

1. 25MHz
2. 35MHz
3. 24MHz
4. 20MHz

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743. The FEC is also refers to

1. Logical layer net bit rate
2. Physical layer net bit rate
3. Prefix layer net bit rate
4. None of these

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744. The fibre optic systems consists of a

1. Light sources
2. Cables
3. Light detectors
4. All of these

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745. The fibre PMD-ANSI X3T9.5/48 describes the physical layer that uses

1. Fibre components
2. Optical components
3. Both a & b
4. None of these

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746. The first 256 code points belong to ____________ for conversion to Roman Text

1. ISO 5589-1
2. ISO 5569-1
3. ISO 5579-1
4. ISO 5559-1

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747. The first and the lowest layer is called the ____________

1. Physical layer
2. Supporting rules for low-level signaling
3. Hardware implementation
4. All of these

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748. The first component-master earth station is also known as

1. Central hub station
2. Central satellite
3. Backbone
4. All of these

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749. The first layer deals with the actual ____________

1. Hardware of networks
2. The specific methods of sending bits from one device to another
3. Both a & b
4. None of these

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750. The first operational computer network in the world was the ____________ for the United States Department of Defense

1. ARPANET
2. ERNET
3. SKYNET
4. DARPANET

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