CASE STUDY

IM HAVING TROUBLE COMPLETING PHASE 1 AND 3 OF THIS CASE STUDY

CAN SOMEONE WHO DID THIS CASE STUDY HELP ME WITH SUBNETTING THIS ADDRESS 223.0.0.0
FOR 36 EMPLOYEES IN THE RESEACH AND DEV. BUILDING
18 IN THE SALES DEPT.
14 IN THE ADMINS. GROUP
10 IN THE REMOTE SALES

I NEED HELP BADLY PLEASE ANYONE!!!

You will need to use VLSM (Variable length subnet masks) This means each subnet will be a different size and cannot overlap the addresses used in other subnets. If you start with the largest number of 36 employees you will find you have to borrow only 2 bits and allow for 62 hosts because borrowing 3 bits will only allow for 30 hosts. This makes your first subnet 223.0.0.0 with a subnet mask of 255.255.255.192. However, if you are restricted from using the zero subnet then it would be 223.0.0.64 with a subnet mask of 255.255.255.192. For the rest of this example I will assume you cannot use the zero subnet.

Continuing this process the next subnet would require you to borrow 3 bits allowing for 30 hosts because borrowing 4 bits would allow for only 14 hosts. And not to overlap the previous subnet you use the next available subnet address which would be 223.0.0.128 with a subnet mask of 255.255.255.224.

For each of the last two subnets you would borrow 4 bits. They would be 233.0.0.160 and 223.0.0.176 with a subnet mask of 255.255.255.240.

If you put these into a table consisting of Subnet address, Usable range, Broadcast address, and Subnet mask you will see that none of the addresses overlap. In fact they are consecutive.