When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined?
A、
It is supplied by the CSU/DSU．
B、
It is supplied by the far end router．
C、
It is determined by the clock rate command．
D、
It is supplied by the Layer 1 bit stream timing．
【正确答案】
A
【答案解析】
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