单选题In a lab, two routers are connected directly together using serial interfaces in a back-to-back configuration. No external DCE devices are being used. What additional command is needed to bring this link up?（）AserialupBclockCclockrateDdcerateEdterate
单选题
In a lab, two routers are connected directly together using serial interfaces in a back-to-back configuration. No external DCE devices are being used. What additional command is needed to bring this link up?（）
A
serialup
B
clock
C
clockrate
D
dcerate
E
dterate
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