LAN Switching and Wireless

151. A local telephone network is an example of a _________ network.

1. packet-switched
2. circuit-switched
3. message-switched
4. none of the above

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152. A parabolic dish antenna is a(n) _________ antenna.

1. omnidirectional
2. bidirectional
3. unidirectional
4. horn

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153. A periodic signal completes one cycle in 0.001 s. What is the frequency?

1. 1 Hz
2. 100 Hz
3. 1 KHz
4. 1 MHz

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154. A port address in TCP/IP is _________ bits long.

1. 32
2. 48
3. 16
4. none of the above

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155. A regenerator is a _________ device.

1. one-layer
2. two-layer
3. three-layer
4. four-layer

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156. A repeater is a connecting device that operates in the _________ layer of the Internet model.

1. physical
2. data link
3. network
4. all of the above

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157. A ring SONET network can be _________.

1. unidirectional
2. bidirectional.
3. either (a) or (b)
4. neither (a) nor (b)

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158. A signal is measured at two different points. The power is P₁ at the first point and P₂ at the second point. The dB is 0. This means _________.

1. P₂ is zero
2. P₂ equals P₁
3. P₂ is much larger than P₁
4. P₂ is much smaller than P₁

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159. A simple parity-check code can detect __________ errors.

1. an even-number of
2. two
3. no errors
4. an odd-number of

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160. A sine wave in the _________ domain can be represented by one single spike in the _________ domain.

1. time; frequency
2. frequency; time
3. time; phase
4. phase; time

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