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阅读以下路由器配置的技术说明，根据要求回答问题1～问题5。
【说明】
某局域网通过两个路由器划分为3个子网，其网络拓扑结构和IP地址分配如图6-8所示．

【问题1】
以下是路由器R1的配置命令列表，请将(1)～(3)空缺处的命令/参数填写完整，以实现路由器 R1的正确配置。
Router＞en
Router＞conf term
Router (config) #hostname R1
(1)
R1 (config-if) #ip address 192.168.1.2 255.255.255.0
R1 (config-if) #no shutdown
R1 (config-if) #int s0
R1 (config-if) #ipa ddress (2)
R1 (coafig-if) #no shutdown
R1 (config-if) #clock rate 56000
R1 (config-if) #exit
R1 (config) #ip routing
R1 (config) #ip route 0.0.0.0 0.0.0.0 (3)
R1 (config) #ip classless
R1 (config) #exit
R1#copy run start

答案

参考答案：

解析：(1) R1 (config) #int e0 (2) 192.168.2.1 255.255.255.0 (3) 192.168.2.2(1)空缺处前面的命令是在全局配置模式(Router (config) #)，而后一个命令是在路由器R1接口 e0 (192.168.1.2/24)的子配置模式(R1 (config-if) #)，根据前后两个命令的提示可知，此处应该是一条进入接口e0子配置模式的命令(R1 (config) #interface e0)。 (2)空缺处前面的命令(R1 (config-if) #int s0)的作用是进入路由器R1接口s0的子配置模式，(2)空缺处所在行的“ip address”进一步提示该处填写的是s0接口的IP地址信息。根据图6-8拓扑结构中的Ⅲ地址信息可知，s0接口的IP地址是192.168.2.1，子网掩码是255.255.255.0。 (3)空缺处前面的命令ip routing的作用是允许配置路由。(3)空缺处所在行的“ip route”提示该行用于完成某条静态路由的配置。目标地址设置为0.0.0.0 0.0.0.0表示默认路由，根据图6-8的拓扑结构，(3)空缺处应填入路由的下一跳地址192.168.2.2。

单项选择题

规定人们依法有权作出某种行为的法律规范属于（）

A、任意性规范

B、指导性规范

C、命令性规范

D、禁止性规范
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问答题

Man first appeared on the earth about 2 million years ago. Then he was little more than an animal; but early man had a big advantage over the animals. He had in his brain special groups of nerve cells, not present in animals that enabled him to invent a language and use it to communicate with his fellow men. 46) This ability to speak was of great value because it allowed men to share ideas, and to plan together, so that tasks impossible for a single person could be successfully undertaken by intelligent team-work. Speech also enabled ideas to be passed on from generation to generation so that the stock of human knowledge slowly increased.
It was this special ability that put men far ahead of other living creatures in the struggle for existence. 47) He mastered darkness first with dim lights and later with brighter and brighter lamps, until he can now make for himself so dazzling a light with an are lamp that, like the sun, it is too p for his naked eyes.
48) Man found that his own muscles were too weak for the work which he wanted to do; he explored many other forms of power until now he has his hands on the ultimate source of physical energy, the nuclear power. From man’s earliest days the flight of birds has raised his wonder and desire. Why should he not fly as they did Then he began to experiment. At last he learnt how to make the right machines to carry him through the air. Now he can fly faster than sound. Already he has plans for conquering space, and a series of experiments has been completed. 49) It will not be long now before man takes a giant step away from his planet and visits the moon, learning what it is like to have no weight to his body, no upward direction and no downward.
Man, always a wanderer, has to overcome the difficulty of adapting himself to different climates. 50) Fortunately, in spite of having no. thick skin or warm fur to protect him, he is peculiarly p compared with other living creatures, most of whom are unable to live far outside the region that suits them best.
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