Question $10$

$1$ pts

What subnet mask is needed if an IPv$4$ network has $40$ devices that need IP addresses and address space is not to be wasted?

$255\mathrm{.}255\mathrm{.}255\mathrm{.}192$

$255\mathrm{.}255\mathrm{.}255\mathrm{.}224$

$255\mathrm{.}255\mathrm{.}255\mathrm{.}240$

$255\mathrm{.}255\mathrm{.}255\mathrm{.}128$