11.2.6/etc/services ■etc/ servces文件内容实例: ftp-data O/tcp ftp-data 20/udp 21 is registered to ftp, but also used by fsp ftp 21/tcp ft 21/udp fsp fspd h 22/tcp SSH Remote login Protocol h 22/udp SSH Remote login Protocol telnet 23/tcp ■ telnet 23/udp11.2.6 /etc/services ◼ /etc/services文件内容实例： ◼ ftp-data 0/tcp ◼ ftp-data 20/udp ◼ # 21 is registered to ftp, but also used by fsp ◼ ftp 21/tcp ◼ ftp 21/udp fsp fspd ◼ ssh 22/tcp # SSH Remote Login Protocol ◼ ssh 22/udp # SSH Remote Login Protocol ◼ telnet 23/tcp ◼ telnet 23/udp