A network administrator is tasked to block all outbound SSH connections on the default port from a network subnet of 10.152.8.0/21 on a Linux based firewall.
Which of the following rule sets would accomplish this task?
A . iptables -i OUTPUT -d 10.152.8.0/21 -p TCP –dport 22 -j REJECT
B . iptables -i OUTPUT -d 10.152.8.0/21 -p TCP –dport 23 -j REJECT
C . iptables -i OUTPUT -d 10.152.8.0/21 -p TCP –dport 22 -j ACCEPT
D . iptables -i OUTPUT -d 10.152.8.0/21 -p TCP –dport 23 -j ACCEPT
Answer: A