Suppose a machine with 32-bit virtual addresses and 40-bit physical addresses is designed with a two-level page table, subdividing the virtual address into three pieces as follows: 10 bit page table number | 10 bit page number |12 bit offset The first 10 bits are the index into the top-level page table, the second 10 bits are the index into the second-level page table, and the last 12 bits are the offset into the page. There are 4 protection bits per page, so each page table entry takes 4 bytes