Which scanning method is least likely to be recognized by intrusion detection tools?
UDP-based approach
ACK-based approach
SYN scanning
TCP Connect scanning
SYN scanning sends an initial TCP packet but does not complete the handshake, which often results in fewer logged events. TCP Connect scanning completes the connection, leaving more evidence in system logs. ACK-based approaches send special flags that can trigger alerts. UDP-based methods are noticeable due to repeated connection attempts on ports.
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