So I am studying for my Network + and CCNA and had some confusion about how packets work. I was reading a similar topic at
And I have a question on what's included inside the Ethernet frame and IP Packet. I understand that when a packet leaves its origin computer and heads to the Default Gateway to the destination computer, it undergoes NAT from both the origin Default Gateway and the Destination Default Gateway. Inside the Ethernet Frame or TCP/IP Packets, at any point when undergoing Network Address Translation (NAT) and after, does any part of the Ethernet or TCP/IP Frames/Packets retain information of the origin computer such as the origin computer's MAC Address, origin's computer IP Address or any personal identifiable information? Will the receiving computer know all these local networking information from the sender?