CMS专题
单选题As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?（）A 24B 4C 3D 16
题目
24
4
3
16
相似问题和答案
第1题：
As a CCNA candidate, you will be expected to know the OSI model very well. Which of the following are associated with the application layer (layer 7) of the OSI model? (Choose two)
A. TCP
B. Telnet
C. FTP
D. Ping
E. IP
F. UDP
B,C 解析：Explanation:
The application layer is the top layer of the OSI model and is used to describe the end user applications that can be used over a network.
Layer Name Examples
Application (layer 7) Telnet, HTTP, FTP, WWW browsers, NFS, SMTP gateways, SNMP
Incorrect Answers:
A. TCP resides at layer 4.
D. ARP is a function of the data link layer, which is layer 2.
E. IP is used at layer 3 (network layer).
第2题：
A.had to have practiced
B.must practice
C.must have practiced
D.should practice
解析：“你玩得很好”这件事发生在过去，后面的话是对过去事情的一种推断、推测，所以需要用 “must have + 过去分词” 结构。
第3题：
9． _______you _______ stay at home today?
A． Do ; have to
B． Must; have to
C． Have; to
D． Do ; must
9．A【解析】have to的疑问形式借助动词do来实现， must的疑问形式是将must提到主语之前，另外还需注意have to与must不能重复使用。故答案为A。
第4题：
As a CCNA candidate, you must know the various layers of the OSI model. At which layers of the OSI Model do Wide Area Networks operate in? (Choose two)
A. Physical Layer
B. Datalink Layer
C. Network Layer
D. Session Layer
E. Transport Layer
F. Presentation Layer
G. Application Layer
A,B 解析：Explanation:
A WAN is a data communications network that covers a relatively broad geographic area and that often uses transmission facilities provided by common carriers, such as telephone companies. WAN technologies generally function at the lower two layers of the OSI reference model: the physical layer and the data link layer as shown below.
Note: Occasionally WAN's would also be considered to operate at layer 3, but since this question asked for only 2 chopices layers 1 and 2 are better choices.
第5题：
You look very tired. You ____ too hard these days.
A. could have worked
B. ought to have worked
C. should have worked
D. must have worked
第6题：
You must speak slowly, so that you can make yourself ________.
A：understood
B：being understood
C：understanding
第7题：
A、do not practice
B、must have practiced
C、may have practiced
D、mustn’t have practiced
第8题：
A、should have done
B、must have done
C、must do
D、have to do
第9题：
If you had taken the medicine yesterday, you ______ much better now.
A、must have felt
B、might have felt
C、would have felt
D、would feel
第10题：
The ability in speaking English and understanding English is very important here. Have you learned English conversation?