640-801 practice exam

I think the answer for this question is wrong. It should be 255.255.248.0. The formula for calculating the subnets should be 2^n-2.

48. You are designing an IP addressing scheme for a company using CIDR compliant routing protcol and routers configured with the ip subet-zero command. You have been assigned a class B network address 172.16.4.0 and you have to divide it into 15 subnets with at minimum of 3000 hosts each. What subnet should you use? e. 255.255.240.0

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Technet wrote:

I think the answer for this question is wrong. It should be 255.255.248.0. The formula for calculating the subnets should be 2^n-2.

That is the formula for 'traditional subnetting' and does not apply when CIDR/ip subnet-zero command is supported/used on all devices. In that case you do not need to subtract the 2.

Please do a search on this topic before starting another discussion on this...

Technet

Thanks!