title: Definition of Network Units: Fragment, Segment, Packet, Frame, Datagram
body: <p>What units are used in network terminology? Where do we use them?</p>
  
  <p>I know the following - but I'm not sure what their meaning is:</p>
  
  <ul>
  <li>Fragment</li>
  <li>Segment</li>
  <li>Packet</li>
  <li>Frame</li>
  <li>Datagram</li>
  </ul>
  
  <p>Can they be assigned to a specific OSI-Layer? Is it more complex?</p>