Which two statements about PAP and CHAP authentication are true? (Choose two)
A. PAP uses a challenge string from the server to the client.
B. PAP can query a TACACS+ server to verify access credentials.
C. CHAP requires the client to supply a username and optional password.
D. PAP requires the client to supply a username and optional password.
E. CHAP uses a challenge string from the server to the client
Answer: D,E
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