问题：

[多选] What are three problems with the tail drop mechanism of managing interface congestion？（）

A . Queuing introduces equal delays for packets of the same flow， resulting in jitter.
B . When congestion occurs， dropping affects most of the TCP sessions， which simultaneously back off and then restart again.
C . All buffers can temporarily be seized by aggressive flows， and normal TCP flows experience buffer starvation.
D . There is no differentiated drop mechanism. Higher priority traffic is dropped in the same way as best-effort traffic.
E . In TCP starvation， traffic exceeds the queue limit because of the bursty nature of packet networks. A router cannot handle multiple concurrent TCP sessions.
F . Global synchronization occurs because multiple TCP hosts reduce their transmission rates at random intervals in response to packet dropping