I just nmaped my localhost, and found these open.

Port State Service
22/tcp open ssh
25/tcp open smtp
111/tcp open sunrpc
139/tcp open netbios-ssn
631/tcp open ipp
708/tcp open unknown
6000/tcp open X11
10000/tcp open snet-sensor-mgmt

What is netbios-ssn, and some of those. Are any of those something I should worry about. I heard things about netbios, and that unknown one has me.