LAN Switching and Wireless

541. The _________ sublayer is responsible for the operation of the CSMA/CD access method and framing.

1. LLC
2. MII
3. MAC
4. none of the above

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542. The _________ technique expands the bandwidth of a signal by replacing each data bit with n bits.

1. FDM
2. DSSS
3. FHSS
4. TDM

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543. The _________ technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency.

1. FDM
2. DSSS
3. FHSS
4. TDM

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544. The __________ between two words is the number of differences between corresponding bits.

1. Hamming code
2. Hamming distance
3. Hamming rule
4. none of the above

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545. The __________ cellular phone system will provide universal personal communication.

1. first-generation
2. second-generation
3. third-generation
4. none of the above

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546. The __________ of a polynomial is the highest power in the polynomial.

1. range
2. degree
3. power
4. none of the above

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547. The __________ of errors is more difficult than the __________.

1. correction; detection
2. detection; correction
3. creation; correction
4. creation; detection

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548. The _________ mode provides synchronization for the entire stream of bits must. In other words, it guarantees that the data arrive at a fixed rate.

1. synchronous
2. asynchronous
3. isochronous
4. none of the above

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549. The _________ rate defines the number of data elements sent in 1s; the _________ rate is the number of signal elements sent in 1s.

1. data; signal
2. signal; data
3. baud; bit
4. none of the above

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550. The _________Protocol has both flow control and error control.

1. Stop-and-Wait
2. Go-Back-N ARQ
3. Selective-Repeat ARQ
4. both (b) and (c)

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