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A large number of consecutive IP address are available starting at 198.16.0.0. Suppose that four organizations, A, B, C, and D, request 4000, 2000, 4000, and 8000 addresses, respectively, and in that order.

what is the correct mask for the organization castle?

given answer: 198.16.24.0/20

my answer: 198.16.32.0/20

please correct me if my answer is wrong

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A: 198.16.0.0 – 198.16.15.255 written as 198.16.0.0/20 (198.16.00000000.0 to 198.16.00001111.255)

B: 198.16.16.0 – 198.16.23.255 written as 198.16.16.0/21 (198.16.00010000.0 to 198.16.00010111.255)

C: 198.16.32.0 – 198.16.47.255 written as 198.16.32.0/20 (198.16.00100000.0 to 198.16.00101111.255)

D: 198.16.64.0 – 198.16.95.255 written as 198.16.64.0/19 (198.16.01000000.0 to 198.16.01011111.255)

what is the correct mask for the organization castle?

This statement is not clear, kindly go through the addresses (bold are the network part and regular are the host part).

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