PC6200 & N Series 802.1x untagged unathorised access

Hi,

Is is possible to implement 802.1x where the unauthorised devices are dropped into an untagged vlan?  My current understanding is that the unauthorised vlan needs to tagged packets to allow data to pass.

The switchers in question are mixture of PC3500,PC6200,N2000,N3000,N4000

Thanks in advance!