With a Class C Network, whats the new subnet mask when u need 16 networks?

According to Cisco and IEEE standards. By default with Class C subnet mask address N.N.N.H. there are 8bits equal to 32bits. If you are creating 16networks you will ask yourself how many bits you will borrow from host. 2 to 4 power equals to 16. 2(4)-2=14 Network this will not work therefore you will need 2 to 5 power equals to 32. 2(5)-2=30 Networks.


128-64-32-16-8-4-2-1


1 1 1 1 1 0 0 0


Remember this from last bit of host.


Subnet Mask by default will be 255.255.255.248.


Hope this helps

With a Class C Network, whats the new subnet mask when u need 16 networks?
255.255.240.0...
Reply:255.255.255.248
Reply:Usually 255.255.255.240 or /28 is the "lowest" subnet mask you can go. However, if you cannot use zero and broadcast subnets, which is rare these days, then you must go to /29 or higher. Cisco will tell you what the conditions are in the specific question on the exam.





Here are some sites to learn and practice subnetting:





http://easysubnet.com/


http://subnettingquestions.com/custom/br...

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