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Examen 202 : Networking Administration »
Section 5 »
Question 4/27
Answer: 126
Explanation: An IP address is 32 bits long. A 25 bit subnet mask means that 25 bits of the IP
address are used for the network address. This leaves 7 bits for the host address. The formula for
working out the number of host addresses is 2 ^ n – 2 (where n is the number of bits used for the host
addresses). 2 ^ 7 – 2 = 126.