國立暨南國際大學 97 學年度第一學期小考試卷

 
科目名稱：計算機網 路 開課系所：資訊工程 學系 任課教師
 吳坤熹
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 考試日期
 2008.10.2

(考試時間: 15:10-15:30)

  1. (20%) Spell out the following terminologies and give brief explanations.
    1. API
    2. GEO
    3. IEEE
    4. EIA






  2. (10%) If a GEO satellite is exactly 22,236 miles above the earth's surface, how long does it take a radio signal to reach the satellite and be transmitted back?  (Assume the signal propagates at the speed of light, i.e., 186,282 miles per second, and that the satellite takes 53 microseconds to retransmit a signal.)





  3. (10%) If a LEO satellite is exactly 1,500 km above the earth's surface, how long does it take a radio signal to reach the satellite and be transmitted back?  (Assume the signal propagates at the speed of light, i.e., 300,000 km per second, and that the satellite takes 53 microseconds to retransmit a signal.)





  4. (10%) Give an example of computer equipment around you which is equipped with infrared communication.






  5. (10%) What is the voltage used in RS-232 standard?




  6. (10%) RS-232 has a special design about "start bit" and "stop bit".  The "stop bit" has the bit value
    1. 0
    2. 1




  7. (20%) Explain the purpose of the following commands on Unix:
    1. ls
    2. pwd
    3. less
    4. gcc



  8. (10%) What does "home directory" mean in a Unix system?