LAN Switching and Wireless

351. In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence numbers?

1. 0 to 63
2. 0 to 64
3. 1 to 63
4. 1 to 64

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352. In a linear block code, the __________ of any two valid codewords creates another valid codeword.

1. XORing
2. ORing
3. ANDing
4. none of the above

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353. In a multiplexed system, _________ lines share the bandwidth of _________ link.

1. 1; n
2. 1; 1
3. n; 1
4. n; n

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354. In a one-stage space division switch, if N = 200, the number of crosspoints is _________.

1. 10,000
2. 20,000
3. 40,000
4. 30,000

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355. In a star-topology Ethernet LAN, _________ is just a point where the signals coming from different stations collide; it is the collision point.

1. An active hub
2. A passive hub
3. either (a) or (b)
4. neither (a) nor (b)

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356. In a three-stage space division switch, if N = 200, the number of crosspoints is _________.

1. 40,000
2. greater than 40,000
3. less than 40,000
4. greater than 100,000

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357. In a time-domain plot, the horizontal axis is a measure of _________.

1. signal amplitude
2. frequency
3. phase
4. time

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358. In a(n) _________ configuration, the stations are automatically connected or disconnected from a VLAN using criteria defined by the administrator.

1. manual
2. automatic
3. semiautomatic
4. none of the above

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359. In a(n) _________ configuration, the administrator types the port numbers, the IP addresses, or other characteristics, using the VLAN software.

1. manual
2. automatic
3. semiautomatic
4. none of the above

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360. In a(n) _________ configuration, the initializing is done manually, with migrations done automatically.

1. manual
2. automatic
3. semiautomatic
4. none of the above

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