Câu 13: CFR-310: CyberSec First Responder

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.)

1. A. iptables -A INPUT -p tcp –dport 25 -d x.x.x.x -j ACCEPT — đáp án hiện tại
2. B. iptables -A INPUT -p tcp –sport 25 -d x.x.x.x -j ACCEPT
3. C. iptables -A INPUT -p tcp –dport 25 -j DROP — đáp án hiện tại
4. D. iptables -A INPUT -p tcp –destination-port 21 -j DROP
5. E. iptables -A FORWARD -p tcp –dport 6881:6889 -j DROP