Objective:

Given 172.16.8.0/22, divide the network so the following are requirements are met:

SalesDepartment needs 300 hosts.

MarketingDepartment needs 76 hosts.

AdministrationDepartment needs 24 hosts.

HRDepartment needs 12 hosts.

AccountingDepartment needs 5 hosts.

So I start with the Sales Department.

(2^n)-2 = 300

Whenn=9, the max number of hosts is510, so that will satisfy the 300 hosts Sales needs.

Next I take 32-9= 23, so the mask for the Sales subnet is /23.

Now comes the part that I get lost and need help.

I'm trying to find the first host address and last host address.

The first host address is 172.16.8.1, the last host address is 172.16.9.254. I get that part.

Next is the Marketing Department. (2^n)-2 = 76, so n=7 to satisfy this requirement.

This subnet is 172.16.10.0. Can someone please shed some light on how the got to that subnet?

The next subnet is 172.16.10.128, how did they get there?

* Please no binary stuff, I don't use it in my studies, and surely not on the exam.

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