Re: Easy question on Subnet zero consideration, subnetting
The restriction on subnet zero is very old - and is almost entirely not enforced in modern networking. The ip subnet-zero command is enabled by default in IOS and has been for a long time. As long as it is enabled then you should be able to use subnet zero with no particular impact.
In your situation if you need 8 subnets - and if you are confident that there will not be growth that might mean that you could need to support 9 or 10 subnets in that address space - then I would suggest that you use 3 bits for subnetting (the 248 mask) and get exactly the 8 subnets that you need.
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