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單項(xiàng)選擇題

Data encryption and decryption occurs at which layer of the OSI model?（）

A.Transport
B.Presentation
C.Session
D.Application

單項(xiàng)選擇題

Which of the following is the MOST accurate description of a L2/L3 switch?（）

A. Performs switching and routing duties
B. A router that directly connects to a switch
C. A multi-purpose switch fabric used in full mesh environments
D. A switch that directly connects to a router