Knowledge only, you'll have to do an exam, and If you do it well, you've got certified.
Thanks for your replay. i think you did not understand my question completely.As per my awareness and information i have for writing the professional exam you need to have minimum 4 and half years SD project exp, in which i think 2 implementation exp is mandatory, then only you can write the exam.
Even though you have enough knowledge to pass the exam let us assume if you have only 2 years of SD project experience you can not write this Professional certification exam. this is what i was asking.
I think you are talking about Associate level SD certification for this it does not require any experience, if you have money simply you can join in any authorized training centre by paying required money for Training fee+exam fee then can appear for exam.
thanks,