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Refer to the exhibit. The network diagram shows two routers connected via point-to-point serial-interface. IP addresses have been configured correctly on the routers; however, pings on each side are unsuccessful. Base on the output shown, what can be concluded about the routers' configurations and what actions could be done to correct the problem?
One-way CHAP authentication is being used. Pings are failing because of authentication problem caused by R2's configured username. Replace the username configured on R2 with "R1"
The configurations are fine. A simple no shutdown command will put the interfaces in up/up status
Two-way CHAP authentication is being used. Remove the "ppp pap sent-username" on R1 to fix the CHAP and PAP authentication problem
One-way CHAP authentication is being used. Removal of the "ppp pap sent-username" command will fix the CHAP and PAP authentication conflict in R1
The network is using a one-way CHAP authentication (notice that only R2 uses the "ppp authentication chap" command, if it's a two-way authentication, both routers should have this command enabled on them). In this scenario, R1 is the client (one that initiates the authentication), and R2 is the server (one that sends the authentication challenge). This means that if R1 wants to communicate with R2, it needs to identify itself as R1 (as configured by the interface-level command "ppp chap hostname R1," or "username R2 password cisco" global commands could be used instead, but not in this case). But then, R2 doesn't know that username (as configured on R2: "username R2 password cisco" instead of "R1" as the username). To fix this problem, replace the configured username on R2 to "R1." (http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html?referring_site=RE&pos=1&page=http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10241-ppp-callin-hostname.html)
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