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Which of the following IP addressing scheme combinations (address range with subnet mask and variably subnetted) can fit a network that needs 50 Point-to-Point WAN links and wastes the fewest subnet and host addresses?
10.10.0.0/26 subnetted with mask /28
10.10.0.0/24 subnetted with mask /29
10.10.0.0/23 subnetted with mask /30
10.10.0.0/25 subnetted with mask /29
10.10.0.0/24 subnetted with mask /30
First and most important "point-to-point" links need only two valid hosts (/30). In binary /30 (1111 1111.1111 1111.1111 1100) the last two 0s represent the host part of the address and the 1s represent the network part of the address. If subnet address 10.10.0.0/24 (1111 1111.1111 1111.0000 0000) is used then 6 bits are borrowed from last ip address. 50 Networks can fit in 64, therefore use 2^6=64 ( for networks ) and 30 6 (bits) = 24.
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