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What must be done to prevent attackers from performing host enumeration sweeps?
Block SNMP at network perimeter
Block SMTP at network perimeter
Block FTP at network perimeter
Block ICMP at network perimeter
Host enumeration sweeps use Internet Control Message Protocol (ICMP) to identify active hosts, which is similar to a ping sweep that verifies a single client is operational, and they can be blocked by blocking ICMP at network perimeter.
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