“Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) of the IP Suite use logical ports as communication endpoints, including client-side user ports (source of application requests) and server-side well-known ports for service access. Examples of well-known server-side ports include: Internet Small Computer Systems Interface (iSCSI – 3260); File Transfer Protocol (FTP Data – 20, FTP Control – 21); Simple Mail Transfer Protocol (SMTP – 25); Hypertext Transfer Protocol (HTTP – 80), and Network File System (NFS – 2049).”