The current mode of operation of the 802.11
station.
The semantics for this object are as follows.
infrastructure - An 802.11 station operates in the
'infrastructure' mode if it discovers a WDS
entity through advertisement messages and registers
with it.
distributed - If the 802.11 station couldn't
discover a WDS entity or has lost contact with the
its parent WDS entity, then the station operates in
the 'distributed' mode. However, the station
listens for the advertisement messages from the WDS
entity in the background to get back to the
'infrastructure' mode.