LAN Switching and Wireless

471. In the OSI model, what is the main function of the transport layer?

1. node-to-node delivery
2. process-to-process message delivery
3. synchronization
4. updating and maintenance of routing tables

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472. In the OSI model, when data is transmitted from device A to device B, the header from A's layer 5 is read by B's _________ layer.

1. physical
2. transport
3. session
4. presentation

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473. In the third generation of cellular phones, __________ uses a combination of W-CDMA and TDMA.

1. IMT-DS
2. IMT-MC
3. IMT-TC
4. IMT-SC

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474. In the third generation of cellular phones, __________ uses CDMA2000.

1. IMT-DS
2. IMT-MC
3. IMT-TC
4. IMT-SC

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475. In the third generation of cellular phones, __________ uses TDMA.

1. IMT-DS
2. IMT-MC
3. IMT-TC
4. IMT-SC

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476. In the third generation of cellular phones, __________ uses W-CDMA.

1. IMT-DS
2. IMT-MC
3. IMT-TC
4. IMT-SC

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477. IPv6 has _________ -bit addresses.

1. 32
2. 64
3. 128
4. variable

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478. Iridium satellites are __________ satellites.

1. GEO
2. MEO
3. LEO
4. none of the above

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479. IS-95 is based on __________.

1. FDMA
2. CDMA
3. DSSS
4. all of the above

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480. IS-95 uses the __________ satellite system for synchronization.

1. GPS
2. Teledesic
3. Iridium
4. none of the above

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