Controls the information accessibility determined by port amount. Each and every TCP application at an IP address is assigned having a separate port amount. Generally, ports twenty and 21 are made use of for FTP. Based upon the port amount in any message TCP decides to which application on that laptop or computer the been given message ought to be despatched. These ports are known as Ephemeral Ports as well as the applications are known as daemons. The daemon for FTP is known as FTPD.