You have a Class A network address with 60 subnets. You need to add 40 new subnets in the next two years and still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?

255.240.0.0

255.248.0.0

255.252.0.0

255.254.0.0

255.0.0.0

Answer:
255.254.0.0

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