以下不属于数据链路层功能的是（ ）。
- A.流量控制
- B.差错控制
- C.帧同步
- D.路由选择
正确答案及解析
正确答案
解析
本题考查OSI参考模型数据链路层功能。
数据链路层作用包括了物理地址寻址，数据的成帧，流量控制，数据的检错，重发等。负责在两个相邻结点间线路上无差错地传送以帧为单位的数据，并进行流量控制；每一帧包括一点数理的数据和一些必要的控制信息。与物理层类似，数据链路层负责建立、维持和释放数据链路的连接。在传送数据时，如果接收点检测到所传数据中有差错，就要通知发送方重发这一帧。经过上述分析，得知A流量控制、B差错控制、C帧同步都属于数据链路层功能，D选项路由选择属于网络层功能。故本题选D。
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