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Flow control is a function that prevents network congestion by ensuring that _(1)_ do not overwhelm_(2)_ with data. There are three commonly used methods for handling network congestion . _(3)_is used by network devices to temporarily store bursts of excess data in memory until they can be processed. _(4)_ are used by receiving devices to help prevent their buffers from overflowing . _(5)_ is a flow-control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.

(1)(2)

A.transmitting devices

B.transmitted devices

C.receiving devices

D.received devices

(3)(4)(5)

A.Buffer

B.Source-quench messages

C.window

D.Windowing

E.Buffering

答案：ACEBD

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