A network administrator is planning a network installation for a large organization. The design requires 100 separate subnetworks, so the company has acquired a Class B network address.
What subnet mask will provide the 100 subnetworks required, if 500 usable host addresses are required per subnet?
A. 255.255.240.0
B. 255.255.248.0
C. 255.255.252.0
D. 255.255.254.0
E. 255.255.255.0
F. 255.255.255.192
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D is correct, 2^7 subnet = 128 subnets, 2^9 hosts = 512 (510 hosts with 1 broadcast and 1 network address)
D does not provide 100 Subnetworks with each containing 500 host addresses. It is only a /23-Network which is offering 500 host addresses for its own.