浙江大学05-06秋冬计算机网络考试试卷

浙江大学2005–2006学年秋季学期

《计算机网络》课程期末考试试卷

开课学院：软件学院，考试形式：闭卷

考试时间：_____年____月____日, 所需时间：120分钟

考生姓名： ___学号：专业：得分：

答案：

For every following question, please select your best answer only

1.The transmission unit for the physical layer is a/an __________.

A.)packet

B.)frame

C.)bit

D.)byte

2.Which best describes the structure of an encapsulated data packet?

A.)Segment header, network header, data, frame trailer

B.)Segment header, network header, data, segment trailer

C.)Frame header, network header, data, frame trailer

D.)Frame header, segment header, data, segment trailer

3.The communication subnet consists of __________.

A.)physical layer, data link layer, and network layer

B.)physical layer, network layer, transport layer

C.)physical layer, data link layer, network layer, transport layer

D.)data link layer, network layer, transport layer, session layer

4.Which of the following statements best describes a WAN?

A.)It connects LANs that are separated by a large geographic area.

B.)It connects workstations, terminals, and other devices in a metropolitan

area.

C.)It connects LANs within a large building.

D.)It connects workstations, terminals, and other devices within a building.

5.Which is the movement of data through layers?

A.)Wrapping

B.)Encapsulation

C.)Traveling

D.)Transmission

6.Which is the OSI model?

A.)A conceptual framework that specifies how information travels through

networks.

B.)A model that describes how data make its way from one application program

to another throughout a network.

C.)A conceptual framework that specifies which network functions occur at each

layer

D.)All of the above

7.Which of the OSI layers divides the transmitted bit stream into frames?

A.)Physical layer

B.)Data link layer

C.)Network layer

D.)Transport layer

8.Which of the following is incorrect?

A.)The OSI model is better the TCP/IP model.

B.)The OSI model provides more efficient implementation than the TCP/IP model.

C.)The OSI model has more layers than the TCP/IP model.

D.)The OSI model makes the distinction between services, interfaces,

protocols.

9.In the TCP/IP model, which layer deals with reliability, flow control, and error

correction?

A.)Application

B.)Transport

C.)Internet

D.)Network access

10.The TCP/IP protocol suite has specifications for which layers of the OSI model?

A.)1 through 3

B.)1 through 4 and 7

C.)3,4,and 5 through 7

D.)1,3,and 4

11.A noiseless 4-k Hz channel is sampled every 1 msec. What is the maximum data

rate?

A.)8000 bps

B.)4000 bps

C.)1000 bps

D.)Can be infinite

12.If a binary signal is sent over a 4-k Hz channel, what is the maximum achievable

data rate?

A.)8000 bps

B.)4000 bps

C.)1000 bps

D.)Can be infinite

13.If a binary signal is sent over a 4-k Hz channel whose signal-to-noise ratio

is 127:1, what is the maximum achievable data rate?

A.)28000 bps

B.)8000 bps

C.)4000 bps

D.)Can be infinite