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Need help with networking ip?

10 departments with a maximum of 20 users each department as follows. IT, Engineering, Sales, MArketing, HR, Security, Finance, Training, Manufacturing and Logistics. Design a simple network with each department in their own subnet. Sorry forgot to mention, the fake purchased Ip address is 192.168.12.1

Public Comments

  1. Do you need to use private ip addresses for this? If so you will need to subnet out the class b network. There are three blocks of private IP addresses: 10.0.0.0 through 10.255.255.255 172.16.0.0 through 172.31.255.255 192.168.0.0 through 192.168.255.255 If your truely subnetting it out with the 192.168.12.1 you aren't going to be able to meet the requirements with 10 departments and a maximum of 20 users each.
  2. its not possible to do subnetting for exactly 10 dept with 20 host, Because you can choose either 8 or 16 and to meet the requirement of 10 you would have to choose 16 subnets. now if you have to choose 16 subnet, in class c maximum you can utilize is 224 ip out of 256 ( 256-16(Network IP)-16(Broadcast IP). that come out to be 14 usable ip per subnet. i.e. 224/16. you can use following list of networks, for the 192.168.12.0 network with the subnet mask 255.255.255.240 Network ip 192.168.12.0,1st usable 192.168.12.1, last usable 192.168.12.14, broadcast 192.168.12.15 so on till 192.168.12.240 192.168.12.241 192.168.12.254 192.168.12.255
  3. Due to the nature of binary mathematics, you will never have just 10 subnets. You can have 2, 4, 8, 16, 32, 64 which are all powers of 2. For example, two to the second power equals 4. If you mask 192.168.12.1 with 255.255.255.224 then you get 8 subnets and 30 hosts per subnet max. This does not meet your 10 subnets requirement. If you mask 192.168.12.1 with 255.255.255.240 then you get 16 subnets and 14 hosts per subnet max. This does not meet your 20 hosts per subnet requirement. My suggestion is you select another ip address to subnet such as 192.168.0.1 with a class B subnet mask such as 255.255.240.0. This would meet both of your requirements, it would yield 16 subnets and 4094 hosts per subnet. You could also use DHCP server to only lease out the 20 ip addresses per subnet. Check out, http://www.subnet-calculator.com/ Sean C. NBC Adjunct Faculty http://www.computersmart.biz
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