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Router R1 sits at the DCE side of the serial cable. The: show interfaces command says:
interface Serial1/0 is up, line protocol is down.
**Which of the following is the most likely issue here ? ** NOEXHIBIT answer is clock rate
Add clock rate interface configuration on the serial interface.
The layer-2 protocol is down, most likely use: "`ppp enable`" or "`hdlc enable`"
You have probably configured the same ip address on both ends and duplicate-ip-address-detection has shutdown the port in the err-disable status
There is a hardware problem on the other end, and it must be fixed before you can communicate
The command show ip interface brief displays a brief summary of all the interfaces configured on the router. In this case there is a status up and protocol down in the serial1/0 output. This is not a L1 physical problem but a L2 protocol failure. The most common failure is encapsulation mismatch (HDLC vs PPP). Another case of this problem might be the Clockrate signal. The Clockrate must be set on the DCE side. For more information refer to: [http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1915.html]
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