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A Cisco router with default values has been connected through a serial line to another non-Cisco router configured with point-to-point encapsulation "HDLC". Both routers are in a down/down state, what can be done to solve the problem?
Verify the IP subnet on both routers match.
Check the serial cabling.
Change the encapsulation of the non-Cisco to PPP.
Perform a "no shut" in the interface connecting both routers.
If the troubleshooting is performed in a bottom-up layered approach, it is necessary to begin solving the issue from the physical layer (Cabling). In this case the question is giving the answer; because the "down/down" state displayed in a show command means that there is a physical problem. An up/down state means that there is an encapsulation problem, which in this case is impossible because the Cisco routers default encapsulation is HDLC. If an interface is administratively shutdown with the "shut" command, the state should be "down/administratively down", so a "no shut" command shouldnt work in this case.
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