$1.$ How many total usable hosts does our IP have available before we use VLSM to design our layout?

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$$ What is the default subnet mask?

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$$ How many separate subnets are needed in the above topology?

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$2.$ In VLSM you must first identify the subnet requiring the largest allotment of IP addresses.

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$$ List the subnets by hosts from largest to smallest.

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$$ Subnet Name$$ Hosts Needed

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$3.$ Assign the subnet masks required for each subnet.

To calculate the subnet, remember that each subnet loses an IP to the Network IP and the Broadcast IP$.$

The largest subnet requires $125$ so the $/26$ subnet only has $30$ usable IP; thus our first subnet must be $/25$ with the ability to hold $126$ usable IP addresses.$$

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$$ Network ID$$ Usable range$$ Subnet Mask

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Labs$\_192\mathrm{.}168\mathrm{.}69\mathrm{.}0/25\_\_\_\_\_192\mathrm{.}168\mathrm{.}69\mathrm{.}1-192\mathrm{.}168\mathrm{.}69\mathrm{.}126\_\_\_\_\_\_\_\_255\mathrm{.}255\mathrm{.}255\mathrm{.}128\_\_\_\_\_\_$

Staff$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Classrooms$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Reception $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

W$1\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$