"Connected to a public network" in my security history?

Hi. Forgive my ignorance, but I'm confused by something I'm seeing in my security history in NIS.

In rapid succession, the history reports the following:

Smart Firewall is enabled.

Connected to a private network.

Connected to a public network.

Connected to a public network. (Teredo tunnel adapter(::0))

 

Is any of this something about which I should be concerned? I've tried searching for info and not really found anything that simply states Yes/No as to whether this is a problem.

Explanations are fine as long as they are accompanied by the aforementioned Yes/No, Good/Bad. ;->

Thanks in advance for any help.