John is attempting to reduce the likelihood that his Linux server could be compromised through exploitation of ports and services that are not necessary or through the use of packets that might be…

John is attempting to reduce the likelihood that his Linux server could be compromised through exploitation of ports and services that are not necessary or through the use of packets that might be out of state, modified, or malicious.His first step will be to configure the built in firewall that exists on the recent Linux version. What is the name of the user space program used to configure this firewall?