单选题You have been allocated a /22 network.How many usable hosts are available?（）A 510B 512C 1022D 1024
题目
单选题
You have been allocated a /22 network.How many usable hosts are available?（）
A
510
B
512
C
1022
D
1024
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参考答案和解析
正确答案：
A
解析：
暂无解析