LAN Switching and Wireless

551. The _________Protocol, adds a simple error control mechanism to the _________Protocol.

1. Stop-and-Wait ARQ; Stop-and-Wait
2. Go-Back-N ARQ; Stop-and-Wait
3. Selective Repeat ARQ; Go-Back-N ARQ
4. none of the above

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552. The AAL is divided into _________ sublayers.

1. two
2. three
3. four
4. none of the above

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553. The access method in Bluetooth is _________.

1. FDMA
2. TDD-TDMA
3. CDMA
4. none of the above

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554. The ATM data packet is a cell composed of _________ bytes.

1. 40
2. 50
3. 52
4. 53

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555. The ATM standard defines _________ layers.

1. two
2. three
3. four
4. five

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556. The carrier that handles inter-LATA services is called a(n) _________.

1. POP
2. IXC
3. LEC
4. none of the above

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557. The carrier that handles intra-LATA services is called a(n) _________ .

1. POP
2. IXC
3. LEC
4. none of the above

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558. The checksum of 0000 and 0000 is __________.

1. 1111
2. 0000
3. 1110
4. 0111

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559. The checksum of 1111 and 1111 is __________.

1. 1111
2. 0000
3. 1110
4. 0111

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560. The constellation diagram of 16-QAM has _________ dots.

1. 4
2. 16
3. 8
4. none of the above

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