LAN Switching and Wireless

571. The Hamming distance between equal codewords is __________.

1. 1
2. n
3. 0
4. none of the above

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572. The HFC network uses _________ cable.

1. twisted-pair
2. coaxial
3. fiber-optic
4. a combination of (b) and (c)

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573. The idea of RZ and the idea of NRZ-I are combined into the _________ scheme.

1. Manchester
2. differential Manchester
3. both (a) and (b)
4. neither (a) nor (b)

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574. The idea of RZ and the idea of NRZ-L are combined into the _________ scheme.

1. Manchester
2. differential Manchester
3. both (a) and (b)
4. neither (a) nor (b)

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575. The IEEE 802.11 standard for wireless LANs defines two services: _________ and _________.

1. BSS; ASS
2. ESS; SSS
3. BSS; ESS
4. BSS; DCF

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576. The IEEE 802.11 wireless LANs use _________ types of frames.

1. four
2. five
3. six
4. none of the above

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577. The IEEE 802.11a, uses _________.

1. FHSS
2. DSSS
3. OFDM
4. either (a) or (b)

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578. The IEEE 802.11b, uses _________.

1. FHSS
2. DSSS
3. OFDM
4. either (a) or (b)

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579. The IEEE 802.11g, uses _________.

1. FHSS
2. DSSS
3. OFDM
4. either (a) or (b)

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580. The IEEE 802.3 Standard defines _________ CSMA/CD as the access method for first-generation 10-Mbps Ethernet.

1. 1-persistent
2. p-persistent
3. non-persistent
4. none of the above

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