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What is the FIRST step in reducing the exposure of a network to Internet Control Message Protocol (ICMP) based attacks?
Correct Answer: B
Active Response Active responses can modify the environment using several different methods. Typical responses include modifying firewall ACLs to block traffic based on ports, protocols, and source addresses, and even disabling all communications over specific cable segments. For example, if an IDS detects a SYN flood attack from a single IP address, the IDS can change the ACL to block all traffic from this IP address. Similarly, if the IDS detects a ping flood attack from multiple IP addresses, it can change the ACL to block all ICMP traffic.