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If your router is facilitating a CSU/DSU, which of the following commands do you need to use to provide the router with a 64000bps serial link?

  • A.RouterA(config)#bandwidth 64
  • B.RouterA(config-if)#bandwidth 64000
  • C.RouterA(config-if)#clock rate 64
  • D.RouterA(config-if)#clock rate 64000

Answer: D

Correct answer: RouterA(config-if)#clock rate 64000

Where the router provides the DCE function it must supply the clocking, and clock rate is set in bits per second under the interface, hence 64000 rather than 64. bandwidth is a quite different command: it sets a value used by routing protocols in their metric calculations and by QoS, and changing it has no effect whatever on the actual line speed.

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