title: What's [TCP ACKed unseen segment] & etc in Wireshark?
body: <p><a href="https://i.stack.imgur.com/0xLVe.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0xLVe.jpg" alt="enter image description here"></a></p>
  
  <p>I've transfer a data via SCP and get some messages in picture above (in black color).What relation about these messages (TCP ACKed...,TCP Zerowindow and TCP Prev...). 
  Thank you very much and sorry about language from network newbie.</p>