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Refer to the exhibit below. A network engineer does not have connectivity between Router _R1 and Router _R2. From the output of the command shown below, what seems to be the problem?
The serial interface has been configured to work with Half-duplex.
The buffer of the serial interface is Full.
The interface Serial 1/0 is administratively down.
The clockrate interface configuration is too high for the serial interface.
The type of cable attached to the serial interface is wrong.
Regularly serial interfaces are attached to a CSU/DSU type of device which supplies clocking for the line to the router. When troubleshooting serial interfaces is important to check the clockrate and the cable connection type. The command _show controllers is commonly used for checking the physical interface itself which usually will be a DTE (Device Terminal Equipment) that connects into a type of DSU. In the scenario above the _show controllers s1/0 command shows that the cable connected to the interface is a V.35 DCE cable, this means that R1 needs to provide clocking of the line to router R2. As the picture shows; the cable connected to the opposite end of S1/0 Router R1 is a DCE, and the command output also shows a DCE. At any DTE side, the configuration needs clocking (clockrate), which in this case, it is not configured.
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