A network administrator wishes to ensure there are no unnecessary open communication paths into a server. Using a port scanner, the administrator finds that ports are reported as closed. Which of the following BEST explains this response?
A. The ports belong to an active system and are denying requests
B. The ports are associated with deprecated services
C. The ports do not belong to a live system
D. The ports replied with a SYN/ACK response
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Is this A or B?
i think its B
nope A is bullshit. A closed port usually means there is no service listening to this port.
Can someone explain this one, I think it’s A no?
A is correct. If you send a SYN packet to a closed port, a RST flag will be sent back.
“When a port is closed, RFC 793 behavior is to respond with a RST “reset” packet.”