You quickly remember that iptables are:
A. Part of Cisco routing tables
B. A command line linux based firewall
C. Define the subnet the network device is located on
D. CIDR notation for DHCP
The correct answer is B.
iptables is a command-line firewall utility that uses policy chains to allow or block traffic. When a connection tries to establish itself on your system, iptables looks for a rule in its list to match it to. If it doesn’t find one, it resorts to the default action.
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