问题 问答题

某机关网络系统工程改造项目,建设内容包括网络工程建设、应用服务系统集成、综合布线与机房建设等内容,经建设单位同意及监理审查确认后,甲承建单位选择了乙承建单位作为分包单位,承担机房与综合布线建设任务。监理实施过程中,在方案设计选优、选备选型、现场旁站、工程深化设计、工程实施、工程测试、验收以及技术培训等方面实施全过程监理服务。

【问题1】
在网络工程实施中,有两台网络交换机需要进行级联,但不能使用以太交换机的级联口。工程人员需要按照EIA/TIA 568标准制作级联双绞线,并且一端已经制作完成,线序如下表所示。请根据给定条件填写表中的待制作端线序,并回答表中提出的问题(填写到问题下的空白处)。

级联线已完成端级联线特制作端
序号已完成端线序已完成端采用的标准?序号待制作端线序待制作端采用的标准?
1橙白1
22
3绿白3
44
5蓝白5
6绿6
7棕白7棕白
88

答案

参考答案:

    级联线已完成端  级联线特制作端
序号已完成端线序已完成端采用的标准序号待制作端线序待制作端采用的标准
1橙白EIA/TIA 568B

   

1 EIA/TLA 568A

               

22 
3绿白3 
44 
5蓝白5 
6绿6 
7棕白7棕白
88

 

解析:

[分析]: 双绞线的连接方法有直通线和交叉线两种。

直通线的水晶头两端都遵循568A或568B标准,双绞线的每组线在两端是一一对应的,颜色相同的在两端水晶头的相应槽中保持一致。交叉线缆的水晶头一端采用568A标准,而另一端则采用568B标准。

同种设备之间连接用交叉线缆,不同设备之间相连用直通线。题目中交换机的级联口不能使用,那么级联就属于同种设备之间的连接,应采用交叉线缆进行连接。

完形填空
完形填空


       Now satellites are   1   to forecast (预报) the weather. They are in space, and they can   2   any
part of the world. The satellites take pictures of the atmosphere(大气) ,  3   this is where the weather
forms(形成). They send these   4   to the weather stations. So meteorologists(气象学家) can see the
weather of any part of the world. From the pictures , the scientists can often say   5   the weather will
change.    
       Today, nearly five hundred weather stations in sixty countries receive satellite pictures. When they
receive new pictures, the meteorologists compare them with earlier  6   . Perhaps they may find that the
 clouds have changed during the last few hours. This may mean that the   7   on the ground may soon
change, too . In their next weather forecast , the meteorologists can say this. So theweather satellites are
a great   8   to the meteorologists.  9   satellites were invented, the scientists could forecast the weather
for about 24 or 48 hours. Now they can make good forecasts for three or fivedays. Soon , perhaps ,
they may   10   forecast the weather for a week or more ahead(提前) .

( )1. A. help        
( )2. A. reach        
( )3. A. so          
( )4. A. satellites  
( )5. A. that        
( )6. A. it          
( )7. A. clouds      
( )8. A. report      
( )9. A. Before      
( )10.A. can          
B. to help    
B. arrive      
B. because    
B. pictures    
B. for        
B. one        
B. weather    
B. luck        
B. After      
B. be          
C. helped          
C. get              
C. even            
C. weather          
C. where            
C. ones            
C. pictures        
C. helpful          
C. Since            
C. be able to      
D. helping            
D. go                 
D. and                
D. space              
D. how                
D. them               
D. trees              
D. help               
D. If                 
D. could