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

  • 1
    Supplied by the CSU/DSU
  • 2
    By the far end router
  • 3
    By the clock rate command
  • 4
    By the Physical layer bits stream timing
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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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