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2046

Breakdown:

11111111.11111111.11111000.00000000

/21 - 21 bits in network address represented by ones in binary address above. Leaves 2^11th power host addresses left (the zeros to the right).

Equals 2048 host addresses minus the two reserved addresses = 2046

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Q: How many host address are there for an address with 21 bits for the network address?
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How do you know how many bits represent the network portion and the host portion?

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