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本课程起止时间为:2022-03-01到2022-06-30
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1 Introduction Unit test

1、 问题:Which is wrong among the following descriptions of network protocols and protocol elements?
选项：
A:Protocol presents network functions
B:Semantic is what to do
C:Grammar means how to do it
D:Time sequence indicates the order of process
答案: 【Protocol presents network functions】

2、 问题:Which is wrong among the following descriptions of the concept of network architecture 
选项：
A:Network architecture is a collection of network hierarchy model and protocols at each layer 
B:All computer networks should follow OSI architecture.
C:The network architecture is abstract, and the technology to realize the network protocol is concrete 
D:The network architecture accurately defines the functions that the computer network should realize
答案: 【All computer networks should follow OSI architecture.】

3、 问题:Which is wrong among the following advantages of the research method of network architecture
选项：
A:Each layer is independent with each other
B:Easy to implement and standardize
C:Allowing for interlayer communication is a sign of flexibility of OSI reference model
D:Changes in implementation technology will not affect the work of the whole system
答案: 【Allowing for interlayer communication is a sign of flexibility of OSI reference model】

4、 问题:Which is wrong among the following description of the basic concepts of OSI reference model
选项：
A:Term ‘Open’ in "OSI Reference Model" refers to being able to be used for any kind of operating system for computer
B:The OSI reference model defines the hierarchy of open systems and the interrelationships between the hierarchies
C:The service definition of OSI explains the services provided by each layer in detail, and does not involve the specific implementation method of interfaces
D:OSI reference model is not a standard, but a conceptual framework used in formulating standards
答案: 【Term ‘Open’ in "OSI Reference Model" refers to being able to be used for any kind of operating system for computer】

5、 问题:Which is wrong among the following descriptions of the 7-level division principle of OSI reference model
选项：
A:Each host in the network can have different levels
B:The same layer of different hosts has the same function
C:Adjacent layers in the same host communicate through the interface
D:The same layer of different hosts realizes the communication between the same layers through the protocol
答案: 【Each host in the network can have different levels】

6、 问题:Which is wrong among the following descriptions of basic features of the physical layer
选项：
A:Bottom layer of the OSI reference model
B:Establishing, managing and releasing physical connections between communicating hosts
C:Realizing transparent transmission of the bit stream
D:Data transmission unit is a byte
答案: 【Data transmission unit is a byte】

7、 问题:Among the following basic features(or properties) of the data link layer, which is the wrong description
选项：
A:Adjacent high layer is the network layer
B:Data link can be established after the physical connection is released
C:Adopting the method of error control and flow control to make the physical line with errors become the physical link without errors
D:The data transmission unit of the data link layer is a frame
答案: 【Data link can be established after the physical connection is released】

8、 问题:Among the following basic features of the network layer, which is the wrong description
选项：
A:Adjacent high layer is the transport lay
B:Selecting an appropriate transmission link for the packet through the communication subnetwork by routing selection algorithm
C:Realizing the functions of flow control, congestion control and network security
D:The data transmission unit of the network layer is a packet
答案: 【Realizing the functions of flow control, congestion control and network security】

9、 问题:Among the following basic features of the transport layer, which is the wrong description
选项：
A:Adjacent lower layer is the network layer
B:Adjacent high layer is the presentation layer
C:Providing reliable end-to-end connection and data transmission services for compute processes distributed in different geographical locations
D:Shielding details of low-level data communication to the high level
答案: 【Adjacent high layer is the presentation layer】

10、 问题:Which is wrong among the following descriptions of OSI environment
选项：
A:7 layers from the application layer to the physical layer of the host shown by the dotted line of the OSI environment and the communication subnet
B:The physical transmission medium connecting the host is included in the OSI environment
C:If a host is not connected to the compute network, it may not need hardware and software to realize functions from the physical layer to the application layer
D:The processes of the host are controlled by the local operating system and do not belong to the OSI environment
答案: 【The physical transmission medium connecting the host is included in the OSI environment】

11、 问题:Among the following descriptions of the data transmission process in OSI environment, the wrong description is
选项：
A:The data generated by the application process of source host is transmitted vertically and layer by layer from the application layer
B:The presentation layer only exchanges data formats without adding protocol headers
C:The target host reads the header layer by layer according to the protocol of each layer, and executes the action specified by the protocol
D:Does not need user intervention in the whole process
答案: 【The presentation layer only exchanges data formats without adding protocol headers】

12、 问题:Among the following characteristics of the transport layer, which is wrong
选项：
A:Realizing distributed process-communication in network environment
B:TCP is a reliable, connection-oriented, byte-stream-oriented transport layer protocol
C:An unreliable, connectionless transport layer protocol for UDP
D:Data unit of protocol is a packet
答案: 【Data unit of protocol is a packet】

13、 问题:What is correct in describing the relationship between the nth layer and the n+1 layer in OSI reference model 
选项：
A:The nth layer provides services for the n+1 th layer
B:The n+1 layer adds a header to the message received from the nth layer
C:The n-layer header is used to coordinate protocol actions between the n-layers of adjacent nodes
D:The nth lay and the n+1 th layer have no influence on each other
答案: 【The nth layer provides services for the n+1 th layer】

14、 问题:In OSI reference model, the first level to provide end-to-end services from bottom to top is
选项：
A:Physical layer
B:Data Link Layer
C:Network layer
D:Transport layer
答案: 【Transport layer】

15、 问题:Among the following components, which does not belong to network architecture
选项：
A:Network hierarchy
B:Protocols used at each layer
C:Agreement details
D:Functions implemented at each layer
答案: 【Agreement details】

16、 问题:The network layer protocol in TCP/IP system provides
选项：
A:Connectionless and unreliable packet service
B:Connectionless and reliable packet service
C:Virtual circuit services with unreliable connections
D:Virtual circuit service with reliable connection
答案: 【Connectionless and unreliable packet service】

17、 问题:The resources shared by the computer network are
选项：
A:Router and switch
B:Domain name, network address and MCA address
C:Computer files and data
D:Computer software, hardware and data
答案: 【Computer software, hardware and data】

18、 问题:Which of the following descriptions of network classification is wrong
选项：
A:A network connecting digital terminal devices such as computers within 10m of the user’s computer is a WSN
B:A network covering 10m to 10km is a LAN
C:A network covering 10 ~ 100km is a MAN
D:A network covering 100 ~ 1000km is a WAN
答案: 【A network connecting digital terminal devices such as computers within 10m of the user’s computer is a WSN】

19、 问题:Which of the following descriptions of WAN characteristics is wrong
选项：
A:WAN is a public data network
B:WAN shall provide telecommunication-level services for users
C:The focus of WAN research is broadband core switching technology
D:The core technology of WAN is line switching technology
答案: 【The core technology of WAN is line switching technology】

20、 问题:Among the following descriptions of broadband metropolitan area network, the wrong description is
选项：
A:Optical fiber transmission network is the foundation of broadband metropolitan area network
B:The integration of traditional telecommunication, cable TV and IP services has become the core service of broadband metropolitan area network
C:Switches in Layer 2 is the core equipment of broadband metropolitan area network
D:Expanding the scale and service quality of broadband access is the key to developing the application of broadband metropolitan area network
答案: 【Switches in Layer 2 is the core equipment of broadband metropolitan area network】

21、 问题:The computer network is composed of network hardware system and network software system.
选项：
A:正确
B:错误
答案: 【正确】

22、 问题:The host computer belongs to the switching node of the network node in the computer network. 
选项：
A:正确
B:错误
答案: 【错误】

23、 问题:In general, network nodes have duality, and can be used as both access nodes and transfer nodes.
选项：
A:正确
B:错误
答案: 【正确】

24、 问题:Physical links do not have the capability of data transmission control. 
选项：
A:正确
B:错误

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