LAN Switching and Wireless

11. _________ can be achieved by using multiplexing; _________ can be achieved by using spreading.

1. Efficiency; privacy and antijamming
2. Privacy and antijamming; efficiency
3. Privacy and efficiency; antijamming
4. Efficiency and antijamming; privacy

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12. _________ can be applied when the bandwidth of a link (in hertz) is greater than the combined bandwidths of the signals to be transmitted.

1. TDM
2. FDM
3. Both (a) or (b)
4. Neither (a) or (b)

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13. _________ can impair a signal.

1. Attenuation
2. Distortion
3. Noise
4. All of the above

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14. _________ connection provides a dedicated link between two devices.

1. point-to-point
2. multipoint
3. primary
4. secondary

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15. _________ consists of a central conductor and a shield.

1. Coaxial
2. Fiber-optic
3. Twisted-pair
4. none of the above

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16. _________ control refers to a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment.

1. Flow
2. Error
3. Transmission
4. none of the above

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17. _________ control refers to methods of error detection and correction.

1. Flow
2. Error
3. Transmission
4. none of the above

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18. _________ conversion involves three techniques: line coding, block coding, and scrambling.

1. Analog-to-digital
2. Digital-to-analog
3. Analog-to-analog
4. Digital-to-digital

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19. _________ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.

1. Digital-to-analog
2. Analog-to-analog
3. Analog-to-digital
4. Digital-to-digital

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20. _________ conversion is the representation of analog information by an analog signal.

1. Digital-to-analog
2. Analog-to-analog
3. Analog-to-digital
4. Digital-to-digital

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