The -sT option in Nmap initiates a TCP connect scan, not a UDP scan. This scan type is the most basic form of scanning with Nmap and consists of completing the TCP three-way handshake with each targeted port. If using Nmap to perform a UDP scan, the correct option would be -sU, not -sT.
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What is the difference between a TCP scan and a UDP scan in Nmap?
What does the -sT option do in Nmap?
Why should I use -sU for UDP scans instead of -sT?