The TCP／IP stack is a complete set ofnetworking protocols．The OSI Model was meantto be a standardized way of connecting devices

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问题 The TCP／IP stack is a complete set ofnetworking protocols．The OSI Model was meantto be a standardized way of connecting devices together,and most protocols have some direct correlation to the OSI Model．The OSI Model has 7 layers，the fourth layer is called ( )．

选项 A、physical layer
B、data link layer
C、application layer
D、transport layer