Common Port Scanning Techniques

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What are the two most common port scanning techniques?

The first:

TCP SYN scanning: TCP SYN scanning is also referred to as half-open scanning because in this method a complete TCP connection is never opened. The attacker sends a SYN packet to the target port. If the port is 58 58 | P a g e open, the attacker is sent the SYN/ACK message. Here the attacker severs the connection by sending an RST packet. If the RST packet goes through, it signals that the port is closed. This type of scanning is difficult to track because, with this type of scanning, the attacker does not execute a complete 3-way handshake connection and most sites do not produce a record of incomplete TCP connections.

The second is:

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