= Solution
<Flow control> prevents a sender from overrunning the receiving <endpoint>'s capacity to buffer and consume data. <Congestion control> prevents the aggregate traffic from overloading the intervening <computer network>, especially shared links and <router> queues. A fast receiver can still sit beyond a congested path; an uncongested path can still lead to a slow receiver. Consequently
$$
\boxed{\text{flow control protects the receiver; congestion control protects the network}.}
$$
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