If you send a SYN to an open port, what is the correct response? (Choose all correct answers.

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If you send a SYN to an open port, what is the correct response? (Choose all correct answers.
A . SYN
B . ACK
C . FIN
D . PSH

Answer: A,B

Explanation:

The proper response is a SYN / ACK. This technique is also known as half-open scanning.