LAN Switching and Wireless

631. The VPI of an NNI is _________ bits in length.

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

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632. The vulnerable time for CSMA is the _________propagation time.

1. the same as
2. two times
3. three times
4. none of the above

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633. The word _________ refers to the portion of a _________ that carries a transmission.

1. channel; link
2. link; channel
3. line; channel
4. line; link

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634. The_________ layer is responsible for the delivery of a message from one process to another.

1. physical
2. transport
3. network
4. none of the above

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635. There are __________________ Internet service providers.

1. local
2. regional
3. national and international
4. all of the above

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636. There are three sampling methods: _________.

1. quantized, sampled, and ideal
2. ideal, sampled, and flat-top
3. ideal, natural, and flat-top
4. none of the above

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637. There is (are) __________ orbit(s) for a GEO satellite.

1. one
2. two
3. many
4. none of the above

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638. This was the first network.

1. CSNET
2. NSFNET
3. ANSNET
4. ARPANET

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639. To avoid collisions on wireless networks, _________was invented.

1. CSMA/CA
2. CSMA/CD
3. either (a) or (b)
4. both (a) and (b)

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640. To deliver a message to the correct application program running on a host, the _________ address must be consulted.

1. port
2. IP
3. physical
4. none of the above

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