单项选择题
Which of these tools should you use to compress VoIP packets on a low-speed Frame Replay circuit?（）
A. Cisco Proprietary payload compression B. Predictor payload compression C. RTP header compression D. TCP header compression
单项选择题 Which version of NTP was the first to support cryptographic authentication?（）
单项选择题 How does NTP help you troubleshoot network problems?（）
单项选择题 Which of the following can we draw from the given information concerning the class-map "all-traffic"?（）
