Question regarding open UDP ports

[baniero]

Hi everyone!

I just ran a nmap scan on my new FreeNAS install with

Code:

sudo nmap -sUV -v -T4 -p0- 192.168.178.44

I got the following results:

Code:

Not shown: 65531 closed ports                                                         
PORT      STATE         SERVICE VERSION                                               
0/udp     open|filtered unknown                                                       
123/udp   open          ntp     NTP v4 (secondary server)
5353/udp  open          mdns    DNS-based service discovery
6000/udp  open|filtered X11                                                           
35285/udp open|filtered unknown

Does anyone know why those ports are open and if they can be closed safely?