For the IP address 10.64.17.4/19, how many configurable network, subnet, and host bits exist?
A) Network: 15, subnet: 3, host: 13
B) Network: 15, subnet: 12, host: 4
C) Network: 7, subnet: 13, host: 11
D) Network: 7, subnet: 11, host: 13
D
Explanation: D) The address 10.64.17.4 is a Class A address, which means the first bit is 0 and the next 7 are reserved for network bits. The other 24 bits are used for hosts. With the mask of /19, or 255.255.224.0, the host portion is subdivided to provide 11 host bits to be used for subnet and the other 13 host bits to be used for host space.
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