John Rumm wrote:

When you want more control that you get with an unmanged one. You can
enforce better security (i.e. limiting traffic between certain parts of
a network to only those parts, regardless of any tricks people may play
to try to spoof the switch). You can actively manage traffic better -
allocating more bandwidth to certain applications or reserving a certain
quality of service. You usually get SNMP monitoring so you can check on
the state and performance of attached kit. Posher ones will have support
for virtual lans and things like spanning tree protocol.

Noted - thanks.

--
Andy