Question

what is an xmas scan? a udp scan with syn/urg/fin set b tcp scan with fin/psh/urg set c udp scan with fin/psh set d tcp scan with syn/ack/fin set

Explanation:

An X - mas scan is a type of TCP scan where the FIN, PSH, and URG flags are set. It is used to try and elicit responses from ports to determine their state. UDP scans are different from TCP scans and do not use these specific flag combinations for an X - mas scan. Also, SYN and ACK are not part of the flag combination for an X - mas scan.

Answer:

B. TCP scan with FIN/PSH/URG set