LAN Switching and Wireless

501. Signals with a frequency below 2 MHz use _________ propagation.

1. ground
2. sky
3. line-of-sight
4. none of the above

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502. Signals with a frequency between 2 MHz and 30 MHz use _________ propagation.

1. ground
2. sky
3. line-of-sight
4. none of the above

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503. Some new two-layer switches, called _________ switches, have been designed to forward the frame as soon as they check the MAC addresses in the header of the frame.

1. cut-through
2. go-through
3. come-through
4. none of the above

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504. SONET defines _________ layers.

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

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505. SONET network topologies can be _________.

1. linear
2. ring
3. mesh
4. all of the above

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506. Standard Ethernet (10-Mbps) uses _________ encoding

1. NRZ
2. AMI
3. Manchester
4. differential Manchester

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507. Stop-and-Wait ARQ is a special case of Go-Back-N ARQ in which the size of the send window is 1.

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

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508. TCP/IP is a _________ hierarchical protocol suite developed _________ the OSI model.

1. seven-layer; before
2. five-layer; before
3. six-layer; before
4. five-layer; after

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509. Teledesic satellites are __________ satellites.

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

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510. Telephone companies provide two types of analog services: analog _________ services and analog _________ services.

1. switched; in-band
2. out-of-band; in-band
3. switched; leased
4. leased; out-of-band

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