A network security analyst has noticed a flood of Simple Mail Transfer Protocol (SMTP) traffic to internal clients. SMTP traffic should only be allowed to email servers.
Which of the following commands would stop this attack? (Choose two.)
A . iptables -A INPUT -p tcp Cdport 25 -d x.x.x.x -j ACCEPT
B. iptables -A INPUT -p tcp Csport 25 -d x.x.x.x -j ACCEPT
C. iptables -A INPUT -p tcp Cdport 25 -j DROP
D. iptables -A INPUT -p tcp Cdestination-port 21 -j DROP
E. iptables -A FORWARD -p tcp Cdport 6881:6889 -j DROP
Answer: A,C
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