Question

why does an ack scan not indicate clearly that ports are open? a ack scans cause a lot of retransmits. b the target system ignores the message. c ack is not a supported flag. d the scanner has to guess.

Explanation:

ACK scans are used to determine if a firewall is state - ful or stateless. When an ACK packet is sent to an open port, the target system may respond in a way that is not conclusive, and the scanner has to make an educated guess based on the response received. This is because the behavior of systems in response to ACK packets is not standardized for indicating open ports clearly.

Answer:

D. The scanner has to guess.