What subnet mask would provide an organization with 512 subnets, each capable of supporting at least 100 hosts, given the network prefix 10.25.0.0/16?
- 255.255.255.128
- 255.255.240.0
- 255.255.255.248
- 255.255.248.0
Explanation: The calculation should start with the IPv4 prefix 10.25.0.0/16. A subnet mask of 255.255.255.128 is required to create 512 subnets, with each subnet accommodating at least 100 hosts. The subnet mask 255.255.255.128 is equivalent to the notation of /25. The difference between /16 and /25 is 9 bits and the 9 bits will produce 512 subnets. A subnet mask notation /25 allows 7 bits for hosts and the 7 bits provide for 126 hosts
Exam with this question: Module 4.6.3 IPv4 Addressing Quiz
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