nmap扫描主机的操作系统

nmap -O 用这个参数
扫出来的结果是：
Running (JUST GUESSING): Linux 2.6.X (86%)
OS CPE: cpe:/o:linux:linux_kernel:2.6
Aggressive OS guesses: Linux 2.6.18 - 2.6.22 (86%)

nmap -sV 用这个参数扫出来是

80/tcp open http Microsoft IIS httpd 8.5
443/tcp open ssl/http Microsoft IIS httpd 8.5
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows

哪个是准确的

http://blog.csdn.net/mingzznet/article/details/46782397