[collectd] network push/pull model clarification

[Chris Burroughs]

My reading of the network [1] and protocol docs [2] is that the model is
as follows:
 - local processes push to collectd on localhost via UDP
 - collectd on each node pushes via UDP to whichever server(s) are
running collectd with a plugin for storing data.

Is that an accurate summary?  (And specifically, am I correct that
collectd avoids any polling over tcp?)

[1] http://collectd.org/wiki/index.php/Networking_introduction

[2] http://collectd.org/wiki/index.php/Binary_protocol