Assuming that the rest of the configuration is correct and that the link has no physical layer problems, what should the administrator do?

While troubleshooting a PPP link that uses PAP authentication, a network administrator notices an incorrectly configured password in the running configuration. The administrator corrects the error by entering the command ppp pap sent-username ROUTER_NAME password NEW_PASSWORD, but the link still does not come up.

Assuming that the rest of the configuration is correct and that the link has no physical layer problems, what should the administrator do?

• Save the configuration to NVRAM.
• Shut down the interface then re-enable it.
• Generate traffic by pinging the remote router.
• Use CHAP to ensure compatibility with the remote router.

Exam with this question: CCNA Exploration 4: EWAN Practice Final Exam