大学MOOC Computer Network Technology and Application(Nanjing University of Posts and Telecommunications)1458208169 最新慕课完整章节测试答案

Quiz

1、单选题：
‏Which is at the bottom layer in the OSI/RM?‍
选项：
A: Physical Layer
B: Network Layer
C: Transport Layer
D: Application Layer
答案: 【 Physical Layer】

2、判断题：
‍The basic transmission unit of Network Layer is packet.‍
选项：
A: 正确
B: 错误
答案: 【 正确】

Unit Test of the First Week

1、单选题：
‌Which is at the bottom of the OSI reference model?  ( )‏
选项：
A: Physical Layer
B: Application Layer
C: Network Layer
D: Transport Layer
答案: 【 Physical Layer】

2、单选题：
‎If the network topology is a "closed loop" which composed of the site and the link connecting the site, then the topology is called ( )‌
选项：
A: Ring topology
B: Star topology
C: Bus topology
D: Tree topology
答案: 【 Ring topology】

3、单选题：
​In the OSI reference model, the first bottom-up level to provide end-to-end services is ( )‎
选项：
A: Transport layer
B: Network Layer
C: Data Link Layer
D: Application Layer
答案: 【 Transport layer】

4、单选题：
‍In the OSI reference model, the main function of the Physical Layer is ( )‏
选项：
A: Transparently transmitting bit streams
B: Access control and management of data link
C: Transferring data frames between physical entities
D: Transferring data frames between physical entities
答案: 【 Transparently transmitting bit streams】

5、单选题：
‎ARPANET is the predecessor of the Internet. It is a ( )‌
选项：
A: Packet switching network
B: Circuit switching network
C: Message Switching Network
D: Mixed Switching Network
答案: 【 Packet switching network】

6、单选题：
​Among the following options, which one is not described in the network architecture. ( )‏
选项：
A: Details of internal protocol implementation 
B: Network level
C: Usage protocol of each layer
D: Functions to be completed for each layer
答案: 【 Details of internal protocol implementation 】

7、单选题：
‌A system that uses various means of communication to organically connect geographically dispersed autonomous computers to realize mutual communication and share hardware, software and data resources is called ( )‎
选项：
A: Computer network
B: Terminal time sharing system
C: Distributed computer system
D: Multi machine system
答案: 【 Computer network】

8、单选题：
‎The syntax of the three elements of network protocol stipulates that ( )‎
选项：
A: “How to say” in communication
B: Explanation of contents to be expressed by both parties in communication
C: What should communication parties “say” when communicating
D: Execution sequence of communication events
答案: 【 “How to say” in communication】

9、单选题：
‏The semantics of the three elements of network protocol stipulate ( )​
选项：
A: What should communication parties “say” when communicating
B: “How to say” in communication
C: Structure or format of data and control information
D: Execution sequence of communication events
答案: 【 What should communication parties “say” when communicating】

10、单选题：
​In computer network architecture, the basic unit of Network Layer transmission is ( )‌
选项：
A: Packet
B: Bit
C: Frame
D: Character
答案: 【 Packet】

11、单选题：
‎In the OSI architecture, what directly serves the Application Layer is ( )‎
选项：
A: Presentation Layer
B: Conversation Layer
C: Transport Layer
D: Network Layer
答案: 【 Presentation Layer】

12、单选题：
‏‍‏IP protocol is located in () of the TCP/IP architecture.‍
选项：
A: Interconnection Network Layer
B: Application Layer
C: Transport Layer
D: Network access Layer
答案: 【 Interconnection Network Layer】

13、单选题：
​A computer network in a building belongs to ( ).‍
选项：
A: LAN
B: PAN
C: MAN
D: WAN
答案: 【 LAN】

14、单选题：
‍In the computer network with star topology composed of N nodes, the number of physical links is ( )‎
选项：
A: N-1
B: N
C: N+1
D: 2N
答案: 【 N-1】

15、单选题：
‍The internal network of a school generally belongs to ( )‏
选项：
A: LAN
B: PAN
C: MAN
D: WAN
答案: 【 LAN】

16、单选题：
‌The abbreviation of "China Education Research Network" is ( )‎
选项：
A: CERNET
B: ChinaDDN
C: ISO
D: ChinaNET
答案: 【 CERNET】

17、单选题：
​The Internet originated from ( )​
选项：
A: U.S.A
B: China
C: France
D: Britain
答案: 【 U.S.A】

18、单选题：
‎In the OSI reference model, which of the basic unit of transmission is frame? ( )‏
选项：
A: Data Link Layer
B: Physical Layer
C: Network Layer
D: Transport Layer
答案: 【 Data Link Layer】

19、判断题：
‌The basic unit of Physical Layer transmission is frame.( )​
选项：
A: 正确
B: 错误
答案: 【 错误】

20、判断题：
‏The basic unit of Data Link Layer transmission is bit.( )‏
选项：
A: 正确
B: 错误
答案: 【 错误】

21、判断题：
‏In the computer network architecture, service is a "vertical" concept.( )​
选项：
A: 正确
B: 错误
答案: 【 正确】

22、判断题：
‏A network protocol consists of three elements: syntax, semantics and synchronization.( )‎
选项：
A: 正确
B: 错误
答案: 【 正确】

23、判断题：
‏In computer network architecture, protocol is a "horizontal" concept.( )​
选项：
A: 正确
B: 错误
答案: 【 正确】

24、判断题：
‍"Internet plus" is the use of information and communication technology and Internet platform, so that the Internet and traditional industries in depth integration.( )‌
选项：
A: 正确
B: 错误
答案: 【 正确】

25、判断题：
‏Everything over IP refers to that IP protocol can run on the various types networks.( )‌
选项：
A: 正确
B: 错误
答案: 【 错误】

26、判断题：
‏The Application Layer of TCP / IP architecture corresponds to the upper three layers of OSI-RM architecture.( )‎
选项：
A: 正确
B: 错误
答案: 【 正确】

27、判断题：
‍TCP / IP is often referred to as the international standard in reality. ( )‎
选项：
A: 正确
B: 错误
答案: 【 正确】

28、判断题：
‌All the Internet standards are published on the Internet in the form of RFC documents.( )​
选项：
A: 正确
B: 错误
答案: 【 正确】

29、判断题：
​In OSI architecture, the place where the adjacent layers interact is called Service Access Point(SAP).( )‌
选项：
A: 正确
B: 错误
答案: 【 正确】

30、判断题：
‌The coverage of network between LAN and WAN is MAN.( )‍
选项：
A: 正确
B: 错误
答案: 【 正确】

31、判断题：
‌‌‌From the perspective of data encapsulation, frames are encapsulated in packets.( )‌‌‌
选项：
A: 正确
B: 错误
答案: 【 错误】

32、判断题：
‏Logically or functionally, a computer network can be summarized as a communication system consisting of a “terminal system” and a ”communication subnetwork”.( )‏
选项：
A: 正确
B: 错误
答案: 【 正确】

Quiz

1、单选题：
‌Among the following factors, the one that will NOT affect the data transmission rate of the channel is ( ).‎
选项：
A: Signal Noise Ratio (SNR)
B: Bandwidth
C: Signal modulation rate
D: Signal propagation speed
答案: 【 Signal propagation speed】

Unit Test of the Second Week

1、单选题：
Compared with multimode fiber, the main characteristics of single-mode fiber are ( )​
选项：
A: Long transmission distance, high cost and thin core
B: Long transmission distance, high cost and thick core
C: Short transmission distance, low cost and thick core
D: Short transmission distance, low cost and thin core
答案: 【 Long transmission distance, high cost and thin core】

2、单选题：
Before communication, the exchange mode that needs to establish physical connection between the sender and the receiver is ( )​
选项：
A: Circuit switching
B: Message exchange
C: Packet switching
D: Store and forward exchange
答案: 【 Circuit switching】

3、单选题：
‏If the transmission rate of a communication link is 4800b / s and 8 levels transmission is adopted, the code transmission rate is ( )​
选项：
A: 1600 Baud
B: 600 Baud
C: 4800 Baud
D: 1200 Baud
答案: 【 1600 Baud】

4、单选题：
The transmission rate is 9600 bit/s, one hour of continuous transmission, it is found that there are 150 bit errors. So the error rate of the communication system is ( )‎
选项：
A:
B:
C:
D:
答案: 【 】

5、单选题：
‌In a CRC (cyclic Redundancy Code) system, if the binary sequence corresponding to the generated polynomial is 10011, then the generated polynomial is ( )‌
选项：
A:
B:
C:
D:
答案: 【 】

6、单选题：
‎For a noise-free channel with a bandwidth of 3kHz, assuming that the number of possible states of each code element is 16, the maximum data transmission rate that the channel can support is up to ( )‏
选项：
A: 24 Kbps
B: 12 Kbps
C: 48 Kbps
D: 96 Kbps
答案: 【 24 Kbps】

7、单选题：
​The multiplexing technology used in CDMA system is ( )‎
选项：
A: Code division multiplexing
B: Frequency division multiplexing
C: Time division multiplexing
D: Wavelength division multiplexing
答案: 【 Code division multiplexing】

8、单选题：

‌It is known that the data to be transmitted is M = 10011. If CRC technology is used for error detection and the generated polynomial is , then the cyclic redundancy code culculated is ( )  

​选项：
A: 011
B: 100
C: 101
D: 010
答案: 【 011】

9、单选题：
‎In the following multiplexing techniques, channel multiplexing using pseudo-random sequence chips to distinguish channels is called ( )‏
选项：
A: Code division multiplexing
B: Time division multiplexing
C: Frequency division multiplexing
D: Wavelength division multiplexing
答案: 【 Code division multiplexing】

10、单选题：

‎If the generated polynomial of CRC is , then the number of bits of corresponding CRC check code is ( ) 

​选项：
A: 8
B: 1
C: 6
D: 14
答案: 【 8】

11、单选题：
‎For a noise-free channel with a bandwidth of 4KHz, if 256 levels are used for transmission, the required communication capacity is ( )‏
选项：
A: 64 Kb/s
B: 12 Kb/s
C: 8 Kb/s
D: 32 Kb/s
答案: 【 64 Kb/s】

12、单选题：
‎Baud rate means ( ) .‍
选项：
A: Number of transmitted signal symbols per second
B: Bits transmitted per second
C: Number of possible signal changes per second
D: Bytes transferred per second
答案: 【 Number of transmitted signal symbols per second】

13、单选题：
‌Among the following transmission media, the lowest bit error rate is ( ) .‍
选项：
A: Optical fiber
B: Coaxial cable
C: Twisted pair
D: Microwave
答案: 【 Optical fiber】

14、单选题：
‍Among the following factors, the channel data transmission rate will not be affected ( ).‏
选项：
A: Signal propagation speed
B: Signal to noise ratio
C: Bandwidth
D: Modulation rate
答案: 【 Signal propagation speed】

15、判断题：
​Assuming that there is only Gauss White Noise in an analog channel with a bandwidth of 3000 Hz and a Signal-to-Noise ratio of 20 dB, the channel can reliably transmit data streams with a rate of 64 kb / s.‌
选项：
A: 正确
B: 错误
答案: 【 错误】

16、判断题：
‎In contrast, the utilization ratio of static TDM is higher than that of dynamic TDM.‏
选项：
A: 正确
B: 错误
答案: 【 错误】

17、判断题：
‍High speed network links increase the data transmission rate, not the link propagation rate.‍
选项：
A: 正确
B: 错误
答案: 【 正确】

18、判断题：
‎After adopting the error control technology, the reliable data transmission can be realized.‍
选项：
A: 正确
B: 错误
答案: 【 错误】

19、判断题：
‍The reason for the concealment of CDMA signal is that the spread spectrum technology is adopted.‌
选项：
A: 正确
B: 错误
答案: 【 正确】

20、判断题：
​In the error control technology, it is to reduce the transmission efficiency in exchange for the ability of data error detection or correction.‍
选项：
A: 正确
B: 错误
答案: 【 正确】

21、判断题：
​Generally speaking, transmission errors can be divided into two categories: random error and burst error.‍
选项：
A: 正确
B: 错误
答案: 【 正确】

22、填空题：

If the symbol period is seconds,  then the transmission rate is________Baud.

‎

‎

‎答案: 【 10000】

23、填空题：

​