单项选择题
A.1–1023 B.1024 and above C.1–256 D.1–65534
A、255.255.255.252 B、255.255.255.248 C、255.255.255.240 D、255.255.255.255
A.172.16.99.255 B.172.16.127.255 C.172.16.255.255 D.172.16.64.127
A.10.254.255.23 B.10.254.255.24 C.10.254.255.255 D.10.255.255.255
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