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Refer to the exhibit. Routers R1 and R2 cannot establish communication, and their interfaces remain down. If cables and interfaces present no problem, what can be the source of the issue?
Username information is not configured properly.
The password must be different.
The IP address of router R2 belongs to a broadcast address.
The "password 0" command must be changed to "password 7"
"PPP authentication chap" command must be followed by "pap".
For a chap authentication to succeed, the username information must be from the device tying to authenticate with the local device. To solve the problem, the username configuration on router R1 must be "username R2 password 0 cisco 123" and the username configuration on router R2 must be "username R1 password 0 cisco 123". The command "password 0" is the configured privileges and the password must be the same. For more information refer to: http://www.ciscopress.com/articles/article.asp?p=2202412&seqNum=7
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