Communication sliding window

In the early network communication process , Data is sent directly without considering the data loss caused by network congestion , So later, in order to solve this problem , A flow control technology – Sliding window protocol , Both sender and receiver should maintain a sequence of data frames , This sequence is called window

Window size : The maximum frame that can continue to send data without waiting for a response is called the window size

Send window ： A window that can continue sending without waiting for a reply

Accept window ： Accept data sent , The frame that falls in the current window , It must be dealt with , But the data that falls outside the window , Allow discarded windows

Animation simulates the process of information transmission
https://media.pearsoncmg.com/aw/ecs_kurose_compnetwork_7/cw/content/interactiveanimations/selective-repeat-protocol/index.html