问题 单项选择题

IP路由器设计的重点是提高接收、处理和转发分组速度,其传统IP路由转发功能主要由______。

A.软件实现

B.硬件实现

C.专用ASIC实现

D.操作系统实现

答案

参考答案:A

解析: 本题考查点是传统IP路由转发功能的实现。传统IP路由利用CPU、共享总线、内存和外围线卡结构来实现路由选择。路由器从输入端口收到一个分组后存入内存,然后根据分组首部地址查找路由表并输出到相应的输出端口。这是通过软件来完成转发功能。 目前先进的纵横式交换结构路由器,采用硬件引擎实现转发,极大的提高了路由器的转发速度。

单项选择题

Education is one of the key words of our time. A man, without an education, many of us believe, is an unfortunate victim of unfortunate circumstances deprived of one of the greatest twentieth-century opportunities. Convinced of the importance of education, modern states "invest" in institutions of learning to get back "interest" in the form of a large group of enlightened young men and women who are potential leaders. Education, with its cycles of instruction so carefully worked out, is punctuated by textbooks--those purchasable wells of wisdom--what would civilization be like without its benefits

So much is certain: that we would have doctors and preachers, lawyers and defendants, marriages and births; but our spiritual outlook would be different. We would lay less stress on "facts and figures" and more on a good memory, on applied psychology, and on the capacity of a man to get along with his fellow-citizens. If our educational system were fashioned after its bookless past we would have the most democratic form of "college" imaginable. Among the people whom we like to call savages all knowledge inherited by tradition is shared by all; it is taught to every member of the tribe so that in this respect everybody is equally equipped for life.

It is the ideal condition of the "equal start" which only our most progressive forms of modern education try to reach again. In primitive cultures the obligation to seek and to receive the traditional instruction is binding on all. There are no "illiterates"--if the term can be applied to peoples without a script--while our own compulsory school attendance became law in Germany in 1642, in France in 1806, and in England 1976, and is still non-existent in a number of "civilized" nations. This shows how long it was before we considered it necessary to make sure that all our children could share in the knowledge accumulated by the "happy few" during the past centuries. Education in the wilderness is not a matter of monetary means. All are entitled to an equal start. There is none of the hurry that, in our society, often hampers the full development of a growing personality. There, a child grows up under the ever-present attention of his parents; therefore the jungles and the savages know of no "juvenile delinquency". No necessity of making a living away from home results in neglect of children, and no father is confronted with his inability to "buy" an education for his child.

Notes: juvenile delinquency 青少年犯罪。

The word "interest" in the first paragraph most probably means()

A. pleasure

B. returns

C. share

D. knowledge

单项选择题