A friend who used to do networking stuff for a global bank had good things to say about Nokia networking gear.
So I guess there are good networking hardware engineers in Finland, and it's not a stretch to imagine Google might have bought some of them up somewhere along the way.
Nokia has been hammered in the past couple of years and has shed[1] and will be shedding more[2] jobs over the next several quarters. Google and other technology companies have probably been circling Finland for a number of months now trying to identify and intake the best talent they can find.
So I guess there are good networking hardware engineers in Finland, and it's not a stretch to imagine Google might have bought some of them up somewhere along the way.