■ Ports allow different network applications running on the same device to distinguish the traffic
■ Ports for incoming connections are opened by a server
which listens then for incoming connections
84.58.39.58 : Port 21*- 10.10.1.11 file transfer
84.58.39.58 : Port 25*- 10.10.1.11 Email send
84.58.39.58 : Port 110*-10.10.1.11 Email receive