Question

What Are The Requirement Of Page-table?

Answer 1

The page table needs one entry per page. Assuming a 4GB (2^32 byte) virtual and physical address space and a page size of 4kB (2^12 bytes), we see that the the 2^32 byte address space must be split into 2^20 pages.

This means the page table must have 2^20 entries.