While troubleshooting a serial line problem, you enable ppp authentication debugging as shown below:
Based on the command output above, what type of 'handshake' was used for PPP authentication?（）
- A、one-way
- B、two-way
- C、three-way
- D、four-way
- E、no handshakes required during authentication
- F、None of the above
正确答案:C
答案解析:有
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