CCNA考试练习题.doc

1) What were the two challenges of creating work model (Select two) (创建网络模型所遇到的两个挑战是什么(选择2个) )?
A. interconnectivity
B. interaction
C. working
D. interoperability
A,D。互通性和互操作性创建网络模型的挑战。
2) The Advanced Research Projects Agency created work(高级研究计划局( A R PA )
创建了什么网络)?
A.
B. FDDI
C.
D. Token Ring
C。A R PA N E T由D A R PA项目创建。
3) What does OSI stand for (OSI代表什么)?
A. Organization for Standards Institute
B. Organization for Standards
C. Open Standards Institute
D. Open Systems Interconnection
D。O S I代表开放系统互连。
4) What are the layers of the OSI reference model, in order (OSI参考模型有哪些层,按顺序
回答)?
A. application, transport, network, physical
B. application, presentation, session, network, transport, data link, physical
C. application, presentation, session, transport, network, data link, physical
D. application, session, transport, physical
5) What is the term for wrapping a data unit with a header and passing it to the next protocol
(用报头包装一个数据信元并传递到下一个协议,代表这个过程的术语是什么)?
A. Windowing
B. Encapsulation
C. Wrapping
D. Heading
6) Which of the following is not defined at the physical layer of the OSI reference model (在
O S I参考模型的物理层中没有定义下面的哪一个)?
A. hardware addresses
B. bitstream transmission
C. voltage levels
D. physical interface
7) Which standards institute created the 802 series of physical/data link layer standards (哪个标准协会创建了物理/数据链路层标准的8 0 2系列)?
A. ANSI
B. DIX
C. ITU-T
D. IEEE
8) Who created (谁创建了E t h e r n e t )?
A. ANSI
B. DIX
C. ITU-T
D. IEEE
9) What is the function of CSMA/CD (CSMA/CD的功能是什么)?
A. It passes a token around a star topology
B. Nodes access work and retransmit if they detect a collision
C. Nodes connect to a dual ring of fiber-optics and use a token-passing scheme
D. Nodes break the frames into tiny cells and forward them through a cell-work.
10) What is a backoff algorithm? (什么是补偿算法)?
A. It is the fault tolerance calculation for FDDI
B. It is a routing calculation for determining the best route
C. It is