The ideal mask would be 255.255.255.248 which would give us exactly the right amount of usable addresses at 6, but the next best is D. with 14 usable address
Correct Answer: D
255.255.255.240 provides 14 usable IP addresses, which is more than enough for the 6 usable IPs the customer needs.
This option is more efficient compared to 255.255.255.224, which provides 30 usable IPs and would waste a larger number of addresses.
255.255.255.240 = 11111111.1111111.1111111.11110000
Number of networks = 2^n; n = on bits (1); 2^4 = 16
Number of host = (2^n) - 2; n = off bits (0); (2^4) - 2 = 14
255.255.255.240 (Option D) is the most efficient choice, as it provides 14 usable addresses, which meets the requirement without wasting too many additional addresses.
The subnet mask 255.255.255.224 (option C) provides 6 usable IP addresses, which is exactly what the customer needs.
255.255.255.240 (option D) provides 14 usable IPs, which is more than needed.
So, C. 255.255.255.224 is the best answer for 6 usable IP addresses.
Wrong-Option C /27 provides 30 usable hosts. However, /29 provides exactly 6 usable host addresses, which is not an option here. Therefore option D is correct.
Since the customer needs 6 usable IP addresses, we should choose the smallest subnet that can accommodate this requirement while minimizing wasted addresses. 255.255.255.240 provides 14 usable addresses, which is the closest match to the requirement of 6 addresses.
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