LAN Switching and Wireless

401. In Go-Back-N ARQ, if frames 4, 5, and 6 are received successfully, the receiver may send an ACK _________ to the sender.

1. 5
2. 6
3. 7
4. any of the above

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402. In hexadecimal colon notation, a 128-bit address is divided into _________ sections, each hexadecimal digits in length.

1. 0.334722222222222
2. 0.335416666666667
3. 0.336111111111111
4. none of the above

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403. In IEEE 802.11, _________ is an optional access method that can be implemented in an infrastructure network (not in an ad hoc network).

1. DCF
2. PCF
3. either (a) or (b)
4. neither (a) nor (b)

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404. In IEEE 802.11, a _________ is made of stationary or mobile wireless stations and an optional central base station, known as the access point (AP).

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

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405. In IEEE 802.11, a BSS with an AP is sometimes referred to as _________.

1. an ad hoc architecture
2. an infrastructure network
3. either (a) or (b)
4. neither (a) nor (b)

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406. In IEEE 802.11, a BSS without an AP is called an _________.

1. an ad hoc architecture
2. an infrastructure network
3. either (a) or (b)
4. neither (a) nor (b)

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407. In IEEE 802.11, a station with _________ mobility can move from one BSS to another, but the movement is confined inside one ESS.

1. no-transition
2. BSS-transition
3. ESS-transition
4. none of the above

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408. In IEEE 802.11, a station with _________ mobility can move from one ESS to another.

1. no-transition
2. BSS-transition
3. ESS-transition
4. none of the above

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409. In IEEE 802.11, a station with _________ mobility is either stationary (not moving) or moving only inside a BSS.

1. no-transition
2. BSS-transition
3. ESS-transition
4. none of the above

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410. In IEEE 802.11, communication between two stations in two different BSSs usually occurs via two _________.

1. BSSs
2. ESSs
3. APs
4. none of the above

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