About: http://webisa.webdatacommons.org/125265195

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports.
http://www.w3.org/ns/prov#wasQuotedFrom	debian-administration.org