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【简答题】
假定在网络上传送1.5MB的文件。设分组长度为1KB,往返时间RTT=80ms。传送数据之前还需要有建立TCP连接的时间,这时间是2*RTT=160ms。试计算在以下几种情况下接收方完全收完该文件的最后一个比特所需的时间。 (1)数据发送速率为10Mbit/s,数据分组可以连续发送。 (2)数据发送速率为10Mbps,但每发送完一个分组后要等待一个RTT时间发送下一个分组。 (3)数据发送速率极快,可以不考虑发送数据所需的时间,但规定在每一个RTT往返时间内只能发送20个分组。 以及解题过程。
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举一反三
【单选题】_____ the help ______ my teacher, I made progress ______ all subjects ______ English. [ ]
A.
Under; from; in; except
B.
With; from; on; besides
C.
With; of; in; except
D.
Under; of; in; except for
【单选题】Under the RGT framework, which of the following strategies applies to a business that offers products and services faster and cheaper than the competition?
A.
Gain
B.
Run
C.
Grow
D.
Transform
【单选题】Under the RGT framework, which of the following strategies applies to a business that increases their customer base by taking it from the competition?
A.
Grow
B.
Run
C.
Transcend
D.
Transform
【单选题】Only under special circumstances ______ to take make-up tests.
A.
are freshmen permitted
B.
freshmen are permitted
C.
permitted are freshmen
D.
are permitted freshmen
【单选题】Look, ____ of fishes are swimming under the bridge!
A.
groups
B.
packs
C.
schools
D.
gangs
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