Multiple choice

Refer to the exhibit. Users who are connected to R1 report that they are unable to establish connectivity to the users who are connected to router R2. A network administrator tests the link with the debug ppp authentication command. Based on the output shown, which statement correctly defines the problem on the link?

  1. R1 uses PAP as a method of authentication, and R2 uses CHAP.R1 uses PAP as a method of authentication, and R2 uses CHAP.

  2. R1 uses PAP as a method of authentication, and R2 uses CHAP.

  3. R1 uses an incorrect user name or password for CHAP authentication.

  4. R2 uses an incorrect user name or password for PAP authentication.
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A Correct answer
Explanation

The debug output shows that R1 is attempting PAP authentication while R2 expects CHAP authentication. This mismatch causes authentication failure because PAP sends credentials in clear text (username/password), while CHAP uses a three-way handshake with MD5 hashes. When both ends don't agree on the authentication method, the PPP link cannot establish. The symptoms show R1 sending PAP credentials and R2 rejecting them because it's configured for CHAP.

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