32 bit address,two page tables
Virtual addresses are split into a 9−bit9−bit top-level page table field, an 11−bit
bit second-level page table field
32-9-11=12,12 is the offset,
if offset is equal to 12 ,page size =2^12
so max page size equal(How large are the pages ) =2^12
number of page : 2^9(in first level)*2^11(in first level)=2^20