title: What does concurrent requests really mean?
body: <p>When we talk about capacity of a web application, we often mention the concurrent requests it could handle. </p>
  
  <p>As my <a href="https://superuser.com/questions/236410/do-all-the-network-cards-use-the-same-frequency-to-send-signals-to-wire">another question</a> discussed, Ethernet use TDM (Time Division Multiplexing) and no 2 signals could pass along the wire simultaneously. So if the web server is connected to the outside world through a Ethernet connection, there'll be literally no concurrent requests at all. All requests will come in one after another.</p>
  
  <p>But if the web server is connected to the outside world through something like a wireless network card, I believe the multiple signals could arrive at the same time through the electro-magnetic wave. Only in this situation, there are real concurrent requests to talk about.</p>
  
  <p>Am I right on this?</p>
  
  <p>Thanks.</p>