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When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?

Supplied by the CSU/DSU
By the far end router
By the clock rate command
By the Physical layer bits stream timing

Correct Answer: 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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