Data communication ELI5

Flow control, like you are five

Flow control, like you are five

Lesson notes

Key points

Imagine pouring juice into a small cup: if you pour too fast it spills, so you wait until your friend drinks.
In a network, flow control stops a fast sender overrunning a slow receiver's buffer, using acknowledgements and a sliding window of unacknowledged frames.

Takeaway: Flow control: the receiver sets the pace, the window enforces it.

Quick check: What problem does flow control prevent between a sender and receiver?

Bits flipped by noise
Receiver buffer overflow
Signals weakening with distance

Flow control matches sending rate to what the receiver can buffer and process.

Pouring juiceSliding window

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