Question $14$

IPv$6$ uses $128$ bits for addressing. It is not easy to estimate$/$imagine how big this num$-$

ber is$.$ Here is one way how you can demonstrate this. Suppose each square millimetre

on the Earth's surface is allocated X IPv$6$ addresses. Calculate how big is X$.$ Assume

that the Earth has a perfect spherical shape with the sphere radius of $6,400km.$