Which QoS mechanism will prevent a decrease in TCP performance?

Which QoS mechanism will prevent a decrease in TCP performance?
A . Shaper
B . Rate-Limit
C . Policer
D . Fair-Queue
E . WRED
F . LLQ

Answer: E

Explanation:

Weighted Random Early Detection (WRED) is just a congestion avoidance mechanism. WRED drops packets selectively based on IP precedence. Edge routers assign IP precedences to packets as they enter the network. When a packet arrives, the following events occur:

The average queue size is calculated.

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