LAN Switching and Wireless

201. At the data link layer, Frame Relay uses a protocol that supports _________ control.

1. flow
2. error
3. either (a) or (b)
4. neither (a) nor (b)

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202. Baseband transmission of a digital signal is possible only if we have a _________ channel.

1. low-pass
2. bandpass
3. low rate
4. high rate

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203. Based on the Clos criteria, if N = 200, then k must be equal to or greater than _________.

1. 21
2. 19
3. 31
4. 41

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204. Based on the Clos criteria, if N = 200, then n must be equal to or greater than _________.

1. 10
2. 20
3. 30
4. 40

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205. Based on the Clos criteria, if N = 200, then the minimum number of crosspoints is greater than or equal to _________.

1. 15,200
2. 18,000
3. 42,000
4. 20,000

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206. Before data can be transmitted, they must be transformed to _________.

1. periodic signals
2. electromagnetic signals
3. aperiodic signals
4. low-frequency sine waves

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207. Bit stuffing means adding an extra 0 to the data section of the frame when there is a sequence of bits with the same pattern as the _________.

1. header
2. trailer
3. flag
4. none of the above

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208. Block coding can help in _________ at the receiver.

1. Synchronization
2. Error detection
3. Attenuation
4. (a) and (b)

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209. Bluetooth is a _________ technology that connects devices (called gadgets) in a small area.

1. wired LAN
2. wireless LAN
3. VLAN
4. none of the above

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210. Bluetooth uses _________ method in the physical layer to avoid interference from other devices or other networks.

1. DSSS
2. FHSS
3. FDMA
4. none of the above

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