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Refer to the exhibit. The command _show interface serial 1/0 is issued on the Router _R4, for some reason the physical line is up, but there is no connectivity between both routers. What can be done to ensure that there is connectivity between both routers?
Set autonegotiate mode in both interfaces.
Change cable in Router R4 to DTE V.35.
Configure clock rate in Router R4s interface S1/0.
Issue a no shutdown in Router R4s interface S1/0.
In this case the interface s1/0 of router R4 is not administratively down. The line protocol is down, because clocking is needed to be configured on the interface. The DCE end of a serial interface must send a clock rate to the DTE. To make serial interfaces work, clocking must be configured in the DCE side of the link. Without clocking the physical line would up but the logical line would be down. Autonegotiate mode is used for Ethernet cables in a LAN, where two end points decide whether to use full duplex or half duplex, and the speed required for both interfaces.
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