port knocking
A means of securing ports on a firewall by requiring the host to attempt to connect to…A means of securing ports on a firewall by requiring the host to attempt to connect to a prespecified sequence of closed ports before being allowed access to the desired port.
Meaning
1 senses(uncountable)A means of securing ports on a firewall by requiring the host to attempt to connect to a prespecified sequence of closed ports before being allowed access to the desired port.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable