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:有
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