Question

what is the difference between the syn scan and a full connect scan? a a full connect scan sends an ack message first. b the syn scan and a full connect scan are the same. c the syn scan doesn’t complete the three - way handshake. d the syn scan uses the psh flag with the syn flag.

Explanation:

A full - connect scan completes the TCP three - way handshake (SYN, SYN - ACK, ACK), while a SYN scan only sends the initial SYN packet and then aborts the connection instead of completing the three - way handshake. Option A is incorrect as a full connect scan sends a SYN first. Option B is wrong as they are different. Option D is incorrect as SYN scan doesn't use PSH flag with SYN flag in the context of the main difference from full connect scan.

Answer:

C. The SYN scan doesn’t complete the three - way handshake.