Cisco CCNA Exam 200-125: Compatible Authentication Methods for MLPPP on Serial Interface

Compatible Authentication Methods for MLPPP on Serial Interface

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Which two authentication methods are compatible with MLPPP on a serial interface? (Choose two.)



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A. B. C. D. E.


MLPPP (Multilink PPP) is a protocol that enables multiple serial links to be bonded into a single logical link to increase bandwidth and redundancy. MLPPP can provide load balancing and failover capabilities between multiple links.

When it comes to authentication methods, MLPPP supports a limited set of authentication protocols due to the way the protocol handles authentication. MLPPP uses the PPP protocol for authentication, which means that the same authentication methods that PPP supports can be used with MLPPP.

The supported authentication methods for MLPPP are PAP (Password Authentication Protocol) and CHAP (Challenge-Handshake Authentication Protocol). These protocols are used to authenticate the connection between the PPP client and server.

PAP is a simple authentication protocol that uses a clear-text password for authentication. When the PPP link is established, the client sends its username and password in plain text to the server for authentication.

CHAP, on the other hand, is a more secure authentication protocol that uses a challenge-response mechanism. In this method, the server sends a challenge to the client, and the client responds with a value that is calculated using a secret shared between the client and the server. This method ensures that the password is never sent in clear text over the network.

LEAP (Lightweight Extensible Authentication Protocol), PEAP (Protected Extensible Authentication Protocol), and TACACS+ (Terminal Access Controller Access Control System Plus) are not compatible with MLPPP. LEAP is a Cisco proprietary authentication method used for wireless networks, while PEAP is an extension of EAP (Extensible Authentication Protocol) used for secure authentication over wireless or wired networks. TACACS+ is a remote authentication protocol used for network devices.

In summary, the correct answers to the question are B (CHAP) and C (PAP) as they are the only authentication methods compatible with MLPPP.