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Answer : 1 Supplied by the CSU/DSU Explanation : Answer: A) Supplied by the CSU/DSU Explanation: Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However, if you do not have a CSU/DSU in your non-production test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.

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