LAN Switching and Wireless

91. __________ satellites can provide direct universal voice and data communications for handheld terminals.

1. GPS
2. Iridium
3. Teledesic
4. none of the above

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92. __________ satellites provide time and location information for vehicles and ships.

1. GPS
2. Iridium
3. Teledesic
4. none of the above

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93. __________ satellites will provide universal broadband Internet access.

1. GPS
2. Iridium
3. Teledesic
4. none of the above

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94. __________codes are special linear block codes with one extra property. If a codeword is rotated, the result is another codeword.

1. Non-linear
2. Convolution
3. Cyclic
4. none of the above

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95. _________ are used for short-range communications such as those between a PC and a peripheral device.

1. Radio waves
2. Microwaves
3. Infrared waves
4. none of the above

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96. _________ cable consists of two insulated copper wires twisted together.

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

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97. _________ is actually a multiport repeater. It is normally used to create connections between stations in a physical star topology.

1. An active hub
2. A passive hub
3. either (a) or (b)
4. neither (a) nor (b)

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98. _________ is part of the media; its location in the Internet model is below the physical layer.

1. An active hub
2. A passive hub
3. either (a) or (b)
4. neither (a) nor (b)

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99. _________ is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.

1. Demodulating
2. Multiplexing
3. Compressing
4. None of the above

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100. _________ is just a connector.

1. An active hub
2. A passive hub
3. either (a) or (b)
4. neither (a) nor (b)

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