多选题Which two statements about subnet masks are true?（）AIf a bit is turned on (1), the corresponding bit in the IP address is used for the host portion.BIf a bit is turned off (0), the corresponding bit in the IP address is used for the host portion.CIf a bit is turned on (1), the corresponding bit in the IP address is used for the network prefix.DIf a bit is turned off (0), the corresponding bit in the IP address is used for the network prefix.
多选题
Which two statements about subnet masks are true?（）
A
If a bit is turned on (1), the corresponding bit in the IP address is used for the host portion.
B
If a bit is turned off (0), the corresponding bit in the IP address is used for the host portion.
C
If a bit is turned on (1), the corresponding bit in the IP address is used for the network prefix.
D
If a bit is turned off (0), the corresponding bit in the IP address is used for the network prefix.
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