LAN Switching and Wireless

411. In IEEE 802.11, the _________ is a timer used for collision avoidance.

1. NAV
2. BSS
3. ESS
4. none of the above

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412. In IEEE 802.11, the access method used in the DCF sublayer is _________.

1. ALOHA
2. CSMA/CA
3. CSMA/CD
4. none of the above

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413. In IEEE 802.11, the access method used in the PCF sublayer is _________.

1. contention
2. controlled
3. polling
4. none of the above

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414. In IEEE 802.11, the addressing mechanism can include up to _________ addresses.

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

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415. In IEEE 802.11, the MAC layer frame has _________ fields.

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

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416. In IEEE 802.11, when a frame is coming from an AP and going to a station, the address flag is _________.

1. 00
2. 01
3. 10
4. 11

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417. In IEEE 802.11, when a frame is going from a station to an AP, the address flag is _________.

1. 00
2. 01
3. 10
4. 11

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418. In IEEE 802.11, when a frame is going from one AP to another AP in a wireless distribution system, the address flag is _________

1. 00
2. 01
3. 10
4. 11

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419. In IEEE 802.11, when a frame is going from one station in a BSS to another without passing through the distribution system, the address flag is _________

1. 00
2. 01
3. 10
4. 11

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420. In IPv4, class _________ has the greatest number of addresses in each block.

1. A
2. B
3. C
4. D

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