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The BEST filter rule for protecting a network from being used as an amplifier in a denial of service (DoS) attack is to deny all:
Correct Answer: A
Explanation/Reference: Explanation: Outgoing traffic with an IP source address different than the IP range in the network is invalid, in most of the cases, it signals a DoS attack originated by an internal user or by a previously compromised internal machine; in both cases, applying this filter will stop the attack.