$1)$ Describe internal fragmentation and when it can occur?

$2)$ Describe external fragmentation and when it can occur?

$3)$ Explain the $2$ differences between a page and a segment

$4)$ Describe logical$,$ relative, and physical addresses?

$5)$ Define the alternative page fetch policies, which is better and why?

$6)$ Define the three replacement algorithms, which is better and why?

$7)$ Define TLB and its purpose

$8)$ Describe Thrashing and when it can occur?