Question

In: Computer Science

1. A data message’s content is important as it related to computer communication protocols. True False...

1. A data message’s content is important as it related to computer communication protocols.

True

False

2. Command-and-execute sequences ensure efficient and accurate information flow.

True

False

3. An 802.11n device can broadcast or receive on up to ten frequencies in the 2.4 or 5 GHz bands.

True

False

4. Multiple electrical transmission lines cannot share a single return wire.

True

False

5. A parallel channel’s width, or number of lines, is typically one byte or one word plus a common return wire.

True

False

6. Why are waves important in communication?

7. Describe some options regarding light transmission in communication technology.

8. List two characteristics in which error detection and correction methods vary.

Solutions

Expert Solution

1

Answer: False

2

Answer: False

5)

Answer: True

7)

Wireless transmission using light frequencies can occur in the infrared, visible, or ultraviolet light spectra. In theory, raw transmission rates can be much higher than for RF transmission because of higher transmission frequency and available bandwidth. As a practical matter, however, atmospheric interference creates major barriers by attenuating light signals rapidly.

Infrared transmissions are effectively limited to a few dozen meters, and laser transmissions in the visible spectrum are limited to a few hundred meters. The need for an unobstructed line of sight is also a barrier to widespread use.

8)

  • Size and content of the redundant transmission
  • Efficient use of the communication channel
  • Probability that an error will be detected
  • Probability that an error-free message will be identified as an error
  • Complexity of the error-detection method

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