TCP - sliding window

Confirm the response strategy , For each data segment sent , Give one ACK Confirm response . received ACK Then send the next data segment . There is a big disadvantage in doing so , It's just poor performance . Especially when the data round-trip time is long .

Window size refers to the maximum value that can continue to send data without waiting for an acknowledgement

Got the first one ACK after , Slide the window back , Continue to send the data of the next segment ; By analogy ;

Window size ： It means the receptivity of the other party , It measures the size of the remaining space in the receiving buffer .
The sliding window ： In your own send buffer , A defined area can be sent directly , Not need it for now ACK

Must the sliding window move back to the right as a whole ？

answer ： not always

When no reply is received , Will the data in the sliding window be lost ？

answer ： I won't