| http://www.w3.org/ns/prov#value | - The basic technique used in the firewall is a packet filter, which judges whether a communication packet is for permitted communications or not according to a source host address, a destination host address, and a port number corresponding to the utilized service (such as remote login (telnet), file transfer (ftp), electronic mail (SMTP), electronic news (NNTP), WWW service (http), etc.) which are
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