When using CHAP which of the following is the first step in the process?
A. The remote node responds with a value calculated using an MD5 hash salted with the password
B. The local router sends a challenge message to the remote router
C. The local router verifies the hash value
D. The local router sends its password
B
Explanation: Password Authentication Protocol (PAP) passes the credential in clear text. A better alternative is Challenge-Handshake Authentication Protocol (CHAP), which never passes the credentials across the network. The CHAP process is as follows:
1. The local router sends a challenge message to the remote router
2. The remote node responds with a value calculated using an MD5 hash salted with the password
3. The local router verifies the hash value with same password, thus ensuring the remote router knows the password without sending the password
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