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1. [单选题]is NOT a concept of White Box Testing.
A. You should execute all logical decisions on their tree and false sides.
B. You should execute all independent paths within a module at least once.
C. You should execute all loops at their boundary conditions.
D. You should execute all interfaces at their boundary conditions.
2. [单选题]关于子网掩码描述错误的是( )。
A. 255.255.0.0是有效的子网掩码
B. 子网掩码255.255.0.0标识IP地址中前两个数作为网络ID
C. 在分类方法中，每个地址类有一个默认的子网掩码
D. 255.0.255.0是有效的子网掩码
