Discussion
A network on the Internet has a subnet mask of 255.255.240.0. What is the maximum number of hosts it can handle ?
Answer: C
The network can handle 4096 hosts.
The mask 255.255.240.0 has \(8 + 8 + 4 = 20\) network bits, so 12 bits remain for hosts and \(2^{12} = 4096\) addresses are available.
1024, 2048 and 8192 correspond to 10, 11 and 13 host bits. The count of usable hosts is often given as 4094 because the all-zero and all-ones host addresses are reserved, but 4096 is the number of addresses in the block and is the only option near that value.
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