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Which two statements about using the CHAP authentication mechanism in a PPP link are true? (Choose two.)
Correct Answer: B,C
Explanation/Reference: Explanation: Understanding and Configuring PPP CHAP Authentication One-Way and Two-Way AuthenticationCHAP is defined as a one-way authentication method. However, you use CHAP in both directions to create a two-way authentication. Hence, with two-wayCHAP, a separate three-way handshake is initiated by each side. In the Cisco CHAP implementation, by default, the called party must authenticate the calling party (unless authentication is completely turned off). Therefore, a one-way authentication initiated by the called party is the minimum possible authentication. However, the calling party can also verify the identity of the called party, and this results in a two-way authentication. One-way authentication is often required when you connect to non-Cisco devices. Reference: http://www.cisco.com/en/US/tech/tk713/tk507/ technologies_tech_note09186a00800b4131.shtml