问题 填空题

如下图所示,某园区网用2.5Gbps的POS技术与Internet相连,POS接口的帧格式是SONET。路由协议的选择方案是,园区网内部采用OSPF协议,园区网与Internet的连接使用静态路由。


请阅读以下R1和R3的部分配置信息,并补充空白处的配置命令或参数,按题目要求完成路由器的配置。
R1缺省路由的配置信息如下:
Router-R1#configure terminal
Router-R1(config)#
Router-R1(config)#ip route 0.0.0.0 ______
Router-R1(config)#exit
Router-R1#
R3的POS接口和OSPF协议的配置信息如下:
Router-R3#confgure terminal
Router-R3(config)#
Router-R3(config)#interface pos3/0
Router-R3(config-if)#description To Internet
Router-R3(config-if)#bandwidth 2500000
Router-R3(config-if)#ip address 221.195.t78.1 255.255.255.252
Router-R3(config-if)#crc 32
Router-R3(config-if)#pos ______
Router-R3(config-if)#no ip directed-broadcast
Router-R3(config-if)#pos flag ______
Router-R3(config-if)#no shutdown
Router-R3(config-if)#exit
Router-R3(config)#router ospf 65
Router-R3(config-router)#network 211.100.66.0 ______ area 0
Router-R3(config-router)#redistribute connected metric-type 1 subnets
Router-R3(config-router)#area 0 range 211.100.66.0 ______
Router-R3(config-router)#exit
Router-R3(config)#

答案

参考答案:255.255.255.128

解析: 网络地址块211.100.66.0/26和211.100.66.64/26聚合后的地址块为211.100.66.0/25。该地址块为路由器R3配置OSPF的子网地址。在路由器的OSPF配置模式下,使用“network ip<子网号><wildeard.mask>area<区域号>”命令定义参与OSPF的子网地址,或使用“area<区域号>range<子网地址><子网掩码>”命令定义某一特定范围予网的聚合。注意network命令中的“<wildeard-mask>”是子网掩码的反码,即反掩码,如掩码为255.255.0.0,其反码应为0.0.255.255。本题中9处应填写子网掩码的反码,子网掩码是255.255.255.128;则反码是0.0.0.127。area命令中使用子网掩码,应为:255.255.255.128。故应填入:255.255.255.128。

填空题
阅读理解

Cities in Europe and around the world may be growing “bike trees” in the near future. Invented by Japan’s JFE Engineering Corp, the invention proved useful in the busiest parts of this nation’s crowded cities.

Local governments of Japan have struggled for ways to encourage people to park their bikes considerably, particularly close to big stations, but that may block some roads and entrances to homes and businesses. “Our cities do not have a lot of space for any kind of parking, including bicycles.” said Mitsuharu Oshima, a spokesman for JFE Engineering. The bike tree comes in two types: one in a tower that is above ground and on the contrary, the other in an underground structure.

A cyclist registers with the operator of the equipment, pays a monthly fee and pushes the wheels of his bicycle into restraints(管理处) at the base of the bike tree. Each bicycle is fitted with an electronic card with the owner’s details. A mechanical arm then pulls the bike into the base of the tower and moves it to a free location inside. To collect the bike later, the cyclist puts his card through a reader and his bike is automatically returned to him in seconds. “The science of the equipment has been difficult —— even though they may look quite simple —— because bikes come in many different shapes and sizes.” said Oshima.

As well as clearing away the road, bicycles cannot be stolen from a bike tree. There are presently versions at seven sites in Japan and two others are under construction, while work is under way on an even larger version —— with room for 9400 bicycles —— in Thailand. And Oshima believes that the idea could catch on in Europe, particularly in countries such as France, Holland and Denmark , where cycling is so popular.

小题1: Cities build this kind of “bike trees” so that they can _______.

A.ask more people to ride bikes

B.provide more jobs for people

C.make more money than before

D.save more room for people小题2:Which is the right order of the following things when you use the bike tree?

① the wheels of the bicycle are put into restraints at the base .

② the card is read and the bike is automatically returned .

③ an electronic card with the owner’s details is given

④ the bike is pulled and moved to a free location inside .

A.③②①④

B.③①④②

C.②①④③

D.②④③①小题3: What made it difficult to design “bike trees”?

A.The location of “bike trees”.

B.The method of finding enough bikes.

C.The differences of the bikes.

D.The importance of traffic safety小题4: From the passage, we can know that _______.

A.countries with many cyclists in Europe will like the idea of “bike trees”

B.there are seven “bike trees” used for holding bikes in Japan

C.local government of Japan encourage people to ride bikes

D.cyclists can use “bike trees” for free in Japan.