Star-schema or snow-flake schema

[sunny bachan prasad]

Hi Guru,
I come across one new question in my interview.
They asked me how Cognos know if the model we are using is star schema or snowflake schema.
Until now i have the view that cognos does not bother if we using either snowflake or star-schema.But if we want performance to be good the we should go with star schema.Please share your experience and correct me if i am wrong.

Thanks in advance
:)

[sunny bachan prasad]

Any updates?