Which of the following port scanning techniques involves resetting the TCP connectionbetween client and server...

The port scanning technique that involves resetting the TCP connection between the client and server abruptly before the completion of the three-way handshake, thereby leaving the connection half-open, is known as a Stealth scan (also referred to as a SYN scan). This technique allows the scanner to inquire about the status of a port without establishing a full TCP connection, making the scan less detectible to intrusion detection systems and less likely to be logged by the target. It's a method used to discreetly discover open ports on a target machine without establishing a full connection that would be visible in logs.References:CREST materials often cover different types of network scanning techniques, including Stealth scans, explaining their methodologies, purposes, and how they can be detected or mitigated.