【網路】通訊埠（port）
port 20、21：File Transfer Protocol (FTP) 22：Secure Shell (SSH) 23：Telnet 25：Simple Mail Transfer Protocol (SMTP) 53：Domain Name System (DNS) 80：HyperText Transfer Protocol (HTTP) 110：Post Office Protocol (POP3) 143：Internet Message Access Protocol (IMAP) 161：Simple Nstwork Management Protocol (SNMP) 443：HTTP Secure (HTTPS) 995：POP3 Secure 3389：Remote Desktop Protocol (RDP)