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Refer to the exhibit. Hosts in network 192.168.10.0/24 cannot reach hosts in network 192.168.20.0/24. What are two possible causes for this failure? (Choose Two)
The cable connector type is different on both ends.
There is an encapsulation mismatch between both serial interfaces.
The IP address configured on the interface serial 1/0 of router R1 is in an incorrect subnet.
The CSU/DSU is not sending a clock signals to interface s1/0 on Router R1.
The interface serial1/0 on Router R2 is administratively shut down.
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; if this is not configured there will be a problem with the serial L2 protocol. In this case the IP network is correctly configured. For more information refer to: [http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1915.html]
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