Linux assumes that there are three levels of page tables. Each Page Table accessed contains the page frame number of the next level of Page Table. Figure 3.3 shows how a virtual address can be broken into a number of fields; each field providing an offset into a particular Page Table. To translate a virtual address into a physical one, the processor must take the contents of each level field, convert it into an offset into the physical page containing the Page Table and read the page frame number of the next level of Page Table. This is repeated three times until the page frame number of the physical page containing the virtual address is found. Now the final field in the virtual address, the byte offset, is used to find the data inside the page.