LAN Switching and Wireless

21. _________ data are continuous and take continuous values.

1. analog
2. digital
3. (a) or (b)
4. none of the above

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22. _________ data have discrete states and take discrete values.

1. Analog
2. Digital
3. (a) or (b)
4. None of the above

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23. _________ defines a protocol data unit (PDU) that is somewhat similar to that of HDLC.

1. MAC
2. LLC
3. LLU
4. none of the above

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24. _________ defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation.

1. Semantics
2. Syntax
3. Timing
4. None of the above

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25. _________ describes the position of the waveform relative to time 0.

1. Frequency
2. Phase
3. Amplitude
4. Voltage

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26. _________ eliminates the varying delay times associated with different-size packets.

1. X.25
2. Frame Relay
3. ATM
4. all of the above

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27. _________ encoding has a transition at the beginning of each 0 bit.

1. RZ
2. Manchester
3. Differential Manchester
4. All the above

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28. _________ encoding has a transition at the middle of each bit.

1. RZ
2. Manchester
3. Differential Manchester
4. All the above

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29. _________ finds the value of the signal amplitude for each sample; _________ finds the change from the previous sample.

1. DM; PCM
2. PCM; DM
3. DM; CM
4. none of the above

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30. _________ in the data link layer separates a message from one source to a destination, or from other messages going from other sources to other destinations.

1. Digitizing
2. Controlling
3. Framing
4. none of the above

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