单项选择题

网络地址和端口翻译（NAPT）用于（），这样做的好处是（）。
网络地址和端口翻译（NAPT）用于（），这样做的好处是（？）。

A．可以快速访问外部主机
B．限制了内部对外部主机的访问
C．增强了访问外部资源的能力
D．隐藏了内部网络的IP配置

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单项选择题

Observe that for the programmer，as for chef， the urgency of the patron（顾客）may govern the scheduled completion of the task，but it cannot govern the actual completion.An omelette（煎鸡蛋），promised in two minutes，may appear to be progressing nicely.But when it has not set in two minutes，the customer has two choices-waits or eats it raw.Software customers have had （？） choices. Now I do not think software （） have less inherent courage and firmness than chefs，nor than other engineering managers.But false （） to match the patron’s desired date is much more common in our discipline than elsewhere in engineering.It is very （） to make a vigorous，plausible，and job risking defense of an estimate that is derived by no quantitative method，supported by little data，and certified chiefly by the hunches of the managers. Clearly two solutions are needed.We need to develop and publicize productivity figures，bug-incidence figures，estimating rules，and so on.The whole profession can only profit from （） such data.Until estimating is on a sounder basis，individual managers will need to stiffen their backbones and defend their estimates with the assurance that their poor hunches are better than wish derived estimates.

A．no
B．the same
C．other
D．lots of

单项选择题

网络地址和端口翻译（NAPT）用于（？），这样做的好处是（）。

A．把内部的大地址空间映射到外部的小地址空间
B．把外部的大地址空间映射到内部的小地址空间
C．把内部的所有地址映射到一个外部地址
D．把外部的所有地址映射到一个内部地址

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