Users can access the network normally. However, the network speed is slow and can’t reach the user’s opening rate. What are the possible causes of this failure? (Multiple Choice)

Users can access the network normally. However, the network speed is slow and can’t reach the user’s opening rate. What are the possible causes of this failure? (Multiple Choice)
A . User PC problems
B . Line activation rate between ONU and user does not meet the requirement
C . The service port has a speed limit
D . Insufficient uplink port bandwidth

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Answer: ABCD