A. 传输效率高,可靠性较好 B. 结构简单,建设方便 C. 布局灵活,方便扩展 D. 覆盖范围广
A. Organization Standard Institute B. Organization Standard Interconnection C. Open System Internet D. Open System Interconnection
A. ISO B. IEEE C. ITU D. IETF
A. 帧 B. 包 C. 段 D. 二进制比特流