有個疑惑 - 3C

Table of Contents

這是我修課時看到的

A client-server system uses a satellite network,with the satellite at a

height of 40,000 km.What is the best-case delay in response to a request?


解答寫request has to go up and down,and the response has to go up and down.

所以40000x4=16000km 16000/300000(光速)=533(msec)

我是覺得應該只要request go up to satellite,response 再go down, 應該只走了

40000x2,請問為什麼解答寫那樣呢?

各位高手有什麼見解?大感謝^^

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All Comments

Damian avatarDamian2007-10-09
server也在地上啦....衛星只是負責傳訊號而已
Jake avatarJake2007-10-09
這個要把衛星看成訊號的轉運站