分組交換可以采用虛電路方式或_(11)_方式實現(xiàn),虛電路方式在通信前需建立一條虛電路,其路徑由_(12)_決定。每條虛電路都有虛電路號碼,該號碼_(13)_。虛電路建立后,各數(shù)據(jù)分組_(14)_到達目的地,然后_(15)_。
(11)
A.線路交換
B.報文交換
C.數(shù)據(jù)報
D.分組
(12)
A.擁塞控制算法
B.流量控制算法
C.路由算法
D.網管算法
(13)
A.全程不變
B.中途可以改變
C.只能改變一次
D.只由源結點確定
(14)
A.經不同虛電路
B.經同一虛電路
C.經自己選擇的路徑
D.經任意路徑
(15)
A.排序后裝配
B.無需排序直接裝配
C.排序后交高層裝配
D.交高層排序裝配
Flow control is a function that prevents network congestion by ensuring that _(16)_ do not overwhelm_(17)_ with data. There are three commonly used methods for handling network congestion . _(18)_is used by network devices to temporarily store bursts of excess data in memory until they can be processed. _(19)_ are used by receiving devices to help prevent their buffers from overflowing . _(20)_ 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.
(16)(17)
A.transmitting devices
B.transmitted devices
C.receiving devices
D.received devices
(18)(19)(20)
A.Buffer
B.Source-quench messages
C.window
D.Windowing
E.Buffering
答案:11-15 CCBBB 16-20 ACEBD
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