Which of the following scans is considered as one of the most reliable?
A. TCP Connect
D. Half-open scan
The correct answer is A.
TCP Connect scan allows a basic type of port scan, which attempts to connect to every port in turn, and notes whether or not the connection succeeded. Once the scan is completed, ports to which a connection could be established are listed as open, the rest are said to be closed. This method of scanning is very effective, and provides a clear picture of the ports you can and cannot access.
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