Default Queue size in cisco routers

Hi All ,

I am new to routers and suddenly I have to know the default buffer
management scheme
on cisco routers for some project which I am working on . So, I
am taking this platform to write
my query.
please let me know which command to use to know the default
buffer management
scheme used on cisco routers ( 2800 series ) . Also I want to
know what is the buffer size of
the interface present in the routers.

With thanks in Advance.

.