单项选择题 You work as a network technician at Company.com， study the exhibit provided. You are implementing this QoS configuration to improve the bandwidth guarantees for traffic towards two servers， one with the IP address 5.5.5.5 and the other with the IP address 5.5.5.4. Even after the configuration is applied， performance does not seem to improve. Which will be the most likely cause of this problem？（）

问答题 IP报头中的FragmentOffset字段的作用？

问答题 交换机上使用哪种组播通信协议？