Answer:
screening
Step-by-step explanation:
Packet screening also known as packet filtering wall is a package that works at the network layer of the OSI model. It screens IP addresses and packet options and its firewall option allows it to block or allow access into the computer, based on what it has detected.
To achieve this, it can employ the dynamic-packet filtering where ports are opened when it is really necessary and then closed. Static-packet filtering in which rules are set manually and the stateful-paket filtering where packets have to move through some sequence.