You are configuring the host firewall on a Linux system and want to make sure that the packets sent by the ping program are not processed by the system. Which command should you use?
A) netfilter -A INPUT -p icmp -j DROP
B) iptables -A INPUT --dport icmp -j DROP
C) netfilter -A INPUT --dport icmp -j DROP
D) iptables -A INPUT -p icmp -j DROP

Question

Quizplus · Accepted Answer

The correct command to block ICMP packets (used by the ping program) on a Linux system's firewall is `iptables -A INPUT -p icmp -j DROP`. This command appends a rule to the INPUT chain to drop packets of protocol icmp.

You Are Configuring the Host Firewall on a Linux System