问题 单项选择题

IEEE802.3标准,定义了CSMA/CD总线介质访问控制子层与 ______。

A.服务器软件

B.路由器协议

C.物理层规范

D.通信软件结构

答案

参考答案:C

解析:[知识点] 结构化布线技术
[评析] IEEE 802委员会为局域网制定了一系列标准,统称为IEEE 802标准。这些标准主要是:
1、IEEE 802.1标准,它包括局域网体系结构、网络互连,以及网络管理与性能测试;
2、IEEE 802.2标准,定义了逻辑链路控制LLC子层功能与服务;
3、IEEE 802.3标准,定义了CSMA/CD总线介质访问控制子层与物理层规范;
4、IEEE 802.4标准,定义了令牌总线(Token Bus)介质访问控制子层与物理层规范;
5、IEEE 802.5标准,定义了令牌环(Token Ring)介质访问控制子层与物理层规范;
6、IEEE 802.6标准,定义了城域网MAN介质访问控制子层与物理层规范;
7、IEEE 802.7标准,定义了宽带技术;
8、IEEE 802.8标准,定义了光纤技术;
9、IEEE 802.9标准,定义了综合语音与数据局域网IVD LAN技术;
10、IEEE 802.10标准,定义了可互操作的局域网安全性规范SILS:
11、IEEE 802.11标准,定义了无线局域网技术。

完形填空
完形填空
     We were late as usual. My husband had insisted on watering the flowers in the garden by him
self, and    1  he discovered that he couldn't manage he asked me for    2  at the last
moment. So now we had only an hour to get to the airport. Luckily there were not many cars and
buses on the road and we were    3  to get there just in time. We checked in and went straight
into a big hall to wait for our    4  to be called. We waited and waited    5  no announcement
was made.We asked for    6  and the girl there told us that the    7  hadn't arrived yet. In the
end there came an announcement telling us that those    8  for Flight JJ 108 could get a free
meal voucher (代金卷) and that the plane hadn't left Spain    9  technical problems. We
thought that meant that it was not    10 for the plane to    11. We waited again for a long time
until half    12  when we were asked to report again. This time we were given free vouchers to
spend the night in a    13 hotel.
     The next morning after a    14 night because of all the planes    15 off and landing, we were
reported back to the airport. Guess    16 had happened while we were    17. Our plane had
arrived and taken off again. All the other    18 had been woken up in the night to    19 the
plane, but for some reason or other we had been    20. You can imagine how we felt.
( )  1.A. when     
( )  2.A. food     
( )  3.A. impossible
( )  4.A. plane     
( )  5.A. so       
( )  6.A. time     
( )  7.A. policeman
( )  8.A. coming   
( )  9.A. for       
( )10.A. possible
( )11.A. repair   
( )12.A. evening   
( )13.A. faraway   
( )14.A. bad       
( )15.A. turning   
( )16.A. what     
( )17.A. awake     
( )18.A. workers   
( )19.A. get       
( )20.A. woken     
B. before     
B. advice     
B. necessary   
B. flight   
B. but       
B. advice     
B. plane     
B. sitting   
B. since     
B. important   
B. sell     
B. noon     
B. nearby     
B. quiet     
B. putting     
B. where     
B. asleep   
B. planes     
B. catch     
B. announced   
C. while
C. praise
C. able
C. fly   
C. otherwise
C. help
C. driver  
C. waiting
C. because
C. safe
C. fly   
C. morning
C. distant
C. sweet
C. taking
C. it   
C. alone  
C. passengers
C. drive  
C. lost
D. until      
D. help      
D. unable    
D. flying    
D. if        
D. information
D.train      
D. working    
D. from      
D. difficult  
D. telephone  
D. afternoon  
D. silent    
D. pleasant  
D. keeping    
D. that      
D. afraid    
D. flights    
D. ride      
D. forgotten  
单项选择题 A3/A4型题