An Exadata database is just like a standard Oracle database - but on steroids. And FlashCache. And SmartScans. And probably a lot more horsepower.
There's more to get to grips with system-wide, of course (networking, sysadmin, storage), but there aren't all THAT many parameters which are specific to Exadata in the Server Parameter file (don't use pfile - that's SO 2001!) that aren't already in a 11gR2 RAC system.
In fact, the only examples which come to mind are the cell_* parameters.
1. Exadata is still Oracle Only. Only thing is Storage Server will have OS, CPU, Memory and Flash Cards to achieve better performance. Through is it will gives you Query Offloading, Smart Scan, Storage Index, HCC and IORM features. In Traditional System we will not have OS, CPU, Memory and Flash Cards.
2. Between Compute Node and Storage Server - 40 GBps Line. In Traditional 8 Gbps line