title: How does CDN DNS Work
body: <p>Recently, I saw I introduction on CDN at</p>
  
  <p><a href="http://www.aflexi.net/technology/how-aflexi-cdn-works" rel="noreferrer">http://www.aflexi.net/technology/how-aflexi-cdn-works</a></p>
  
  <p>I was wondering, why user's web browser will know it need to contact Aflexi DNS Server in Los Angeles, but not DNS Server provided by ISP (Like AOL)?</p>
  
  <p>Thanks!</p>