R1# sh ip int br
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 172.16.1.1 YES manual up up
Serial0/0 10.1.1.1 YES manual up down
Serial0/1 unassigned YES NVRAM administratively down down
Hosts with ip address 172.16.1.10 are unable to reach hosts in network 192.168.1.0/24. Based on the output from R1, what are two possible reasons for the failure?
| A. |
The cable that is connected to serial0/0 on R1 is broken. | |
| B. |
Interface S0/0 on R2 is administratively down. | |
| C. |
Interface S0/0 on R1 is configured with an incorrect subnet mask. | |
| D. |
The IP address that is configured on S0/0 of R2 is not in the correct subnet. | |
| E. |
Interface S0/0 on R1 is not receiving a clock signal from the CSU/DSU. | |
| F. |
The encapsulation that is configured on S0/0 of R2 does not match the encapsulation that is configured on S0/0 of R1. |
Serial0/0 physical status (OSI Level 1) is UP. The broken cable is physical problem.
Serial0/0 data status (OSI Level 2) is DOWN
so is L2 is down and more upper levels like ip address/subnet mask not problem now.