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Network administrators typically block ICMP requests making it difficult to determine if a target is alive. In order to determine if the target is alive what other method should be used.
Null Connections
Port Scanning
SMB Validation
Port Sniffing
The correct response is Port Scanning. Port scanning is accomplished by sending a message to each port, one at a time. The kind of response received indicates whether the port is used and can be probed for further weaknesses.
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