LAN Switching and Wireless

621. The simplest type of switching fabric is the _________ switch.

1. crosspoint
2. crossbar
3. TSI
4. STS

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622. The standard for data transmission over an HFC network is called _________.

1. MCNS
2. DOCSIS
3. CMTS
4. ADSL

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623. The Stop-And-Wait ARQ, Go-Back-N ARQ, and the Selective Repeat ARQ are for _________ channels.

1. noisy
2. noiseless
3. either (a) or (b)
4. neither (a) nor (b)

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624. The TCP/IP _________ layer is equivalent to the combined session, presentation, and application layers of the OSI model.

1. application
2. network
3. data link
4. physical

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625. The telephone network is made of _________ major components.

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

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626. The term modem is a composite word that refers to the two functional entities that make up the device: a signal _________ and a signal _________.

1. modulator; demodulator
2. demodulator; modulator
3. modern; demo
4. none of the above

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627. The traditional cable TV system used _________ cable end to end.

1. twisted-pair
2. coaxial
3. fiber-optic
4. none of the above

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628. The two most common digital services are _________ service and _________.

1. switched/56; switched/64
2. switched/56; DDS
3. DDS; swiched 64
4. leased; out-of-band

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629. The United States is divided into many _________.

1. LECs
2. LATAs
3. IXCs
4. none of the above

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630. The VPI of a UNI is _________ bits in length.

1. 8
2. 12
3. 16
4. 24

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