title: The same Source and Destination address and ports
body: <p>I am learning how the IP and TCP headers work. The following is my question:</p>
  
  <p><strong>Can a source address and destination address in an IP header be the same? or doesnt it make any sense?</strong></p>
  
  <p><img src="https://i.stack.imgur.com/jjbDD.gif" alt="enter image description here"></p>
  
  <p><strong>Similarly, can a source and destination port be the same within a TCP header?</strong></p>
  
  <p><img src="https://i.stack.imgur.com/fp5Mj.jpg" alt="enter image description here"></p>
  
  <p>I tried searching google but I didnt find anything specific to my question, but rather how the protocols work.</p>