What do you conclude from the nmap results below?
Staring nmap V. 3.10ALPHA0 (www.insecure.org/map/)
(The 1592 ports scanned but not shown below are in state: closed)
PortStateService
21/tcpopenftp
25/tcpopensmtp
80/tcpopenhttp
443/tcpopenhttps
Remote operating system guess: Too many signatures match the reliability guess the OS. Nmap run completed 1 IP address (1 host up) scanned in 91.66 seconds
A.
The system is a Windows Domain Controller.
B.
The system is not firewalled.
C.
The system is not running Linux or Solaris.
D.
The system is not properly patched.
Explanation:
There is no reports of any ports being filtered.
I saw this question on another site and the answer to this question was D
Yes, I also the other similar question and the answer was “the system is not properly patched”
I’ve seen this listing Windows as the answer, which is also wrong. Bob, patching has nothing to do with ports being opened. It’s talking about firewalls and other preventative measures at that point. Also, nmap can’t guess the OS here, so that takes the OS answers invalid. I don’t like this question, as it does not include the actual command used, and I’m sure a diagram or something is missing from the question.
This assumes that if you don’t see somethings as ‘open|filtered’ or ‘filtered’, that there is no type of protections before the server, it’s just wide open for ports scanning and icmp messages back are not blocked either. You’d probably try to banner grab and enumerate to guess the OS at this stage (which is another question similar to this you might find) but they’re not asking you that.