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$1.$ In a class B subnet, we know the IP address of one of the hosts and the subnet mask as given below:$$

IP Address: $131\mathrm{.}134\mathrm{.}112\mathrm{.}66$ Subnet mask: $255\mathrm{.}255\mathrm{.}224\mathrm{.}0$

What is the first address $($subnet address$)?$ What is the last address?

$2.$ Find the subnet mask in each case:

a$.$ J $024$ subnets in class A

b$.256$ subnets in class B

c$.32$ subnets in class C

d$.4$ subnets in class C

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$3.$ In$$ a$$ block$$ of$$ addresses,$$ we know$$ the IP address$$ of$$ one$$ host$$ is $182\mathrm{.}44\mathrm{.}82\mathrm{.}16/26.$ What is the first address $($network address$)$ and the last address $($limited broadcast address$)$ in this block?

$4.$ An organization is granted the block $211\mathrm{.}17\mathrm{.}180\mathrm{.}0/24.$ The administrator wants to create $32$ subnets.

a$.$ Find the subnet mask.

b$.$ Find the number of addresses in each subnet.

c$.$ Find the first and the last address in the first subnet.