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⑶A.数据 B.指令 C.控制 D.UDP
⑷A.384 B.512 C.1024 D.1500
⑸A.确认PDU B.应答PDU C.请求PDU D.无数据的数据PDU
答案:BCABD
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.
⑴⑵A.transmitting devices B.transmitted devices
C.receiving devices D.received devices
⑶⑷⑸A.Buffer B.Source-quench messages
C.window D.Windowing E.Buffering
Answer:ACEBD
综合练习题网上专用:
1、 接收端发现有差错时,设法通知发送端重发,直到正确的码字收到为止,这种差错控制方法称为(1)。现代数据传输按照传输方向可以分为3种不同的传输方式,其中在任何时候,通讯双方都能同时收发数据的是(2),为了在通讯过程中,使收发双发的步调一致,通常采用到(3)技术,为了检查出在通讯过程中的产生的差错的数据,通常要在数据上附加一些校验码,在下列几种校验码方案中,不仅能发现错误,并且也可以纠正错误的方案是(4),在OSI模型中,第N层和其上的N+1层的关系是(5)。
(1)A、前向纠错 B、自动请求重发 C、冗余检验 D、混合差错控制
(2)A、单工通讯 B、全双工通讯 C、半双工通讯 D、双向通讯
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