LAN Switching and Wireless

31. _________ is a collection of many separate networks.

1. A WAN
2. An internet
3. a LAN
4. None of the above

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32. _________ is a digital multiplexing technique for combining several low-rate channels into one high-rate one.

1. FDM
2. TDM
3. WDM
4. None of the above

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33. _________ is a digital process that allows several connections to share the high bandwidth of a link.

1. FDM
2. TDM
3. WDM
4. None of the above

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34. _________ is a multiple-access method in which the available bandwidth of a link is shared in time, frequency, or through code, between different stations.

1. Random access
2. Controlled access
3. Channelization
4. none of the above

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35. _________ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer.

1. TCP
2. UDP
3. IP
4. none of the above

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36. _________ is a standard developed by ANSI for fiber-optic networks.

1. SONET
2. SDH
3. either (a) or (b)
4. neither (a) nor (b)

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37. _________ is a standard developed by ITU-T.

1. SONET
2. SDH
3. either (a) or (b)
4. neither (a) nor (b)

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38. _________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.

1. Attenuation
2. Distortion
3. Noise
4. Decibel

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39. _________ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.

1. Attenuation
2. Distortion
3. Noise
4. Decibel

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40. _________ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.

1. Attenuation
2. Distortion
3. Noise
4. Decibel

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