title: What is the difference between UDP and TCP packets? What do you use them for?
body: <p>I was configuring IPtable yesterday. My colleague just asked me this question, and I couldn't anwser. I realized that I'm a much better developper than sysadmin and need to improve that.</p>
  
  <p>So what are they? What are they for? Cons/Pros (if it's relevant).</p>