title: Does WebRTC use TCP or UDP?
body: <p>I have some questions about WebRTC:</p>
  <ol>
  <li>Does WebRTC use TCP or UDP as its peer-to-peer transport? How can I
  know?</li>
  <li>I read that there are reliability mode and DTLS agreement, how does
  these affect?</li>
  <li>Is this transport the same for both Media and DataChannel?</li>
  <li>How do I switch between TCP and UDP?</li>
  </ol>
  <p>I ask this because I know that browsers have a limit on the number of parallel connections  (I think they talk over TCP), and maybe UDP connection is not limited.</p>