Question

On a Linux system, which command allows you to modify settings used by the built-in packet filtering firewall?

a.
ipf
b.
iptables
c.
netwall
d.
modfire

Answer 1

iptables

Step-by-step explanation:

On a Linux system, iptables command allows us to modify settings of the built-in packet filtering firewall.

Iptables is used to set up, maintain, inspect and update the tables of IP packet filtering rules on Linux.

For example,

• To view the current rule settings we can use the command:

# iptables -L -n -v

• To add new firewall rules:

# iptables -I INPUT <rule number> -s <source-ip address> -j DROP