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VOIP is being implemented in the network and you need to assess the need for QoS. Which of thefollowing network problems would indicate a need to implement QoS features？（）
- A、Mis-routed packets
- B、Excess jitter
- C、Delay of critical traffic
- D、Packet loss due to congestion
- E、Data link layer broadcast storms
- F、FTP connections unsuccessful
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