大学MOOC Introduction of Information Communication Network(Southeast University)1458198165 最新慕课完整章节测试答案

Tests

1、单选题：
‎Which is wrong among the following descriptions of the 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】

2、单选题：
‌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】

3、单选题：
‏In the 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】

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

5、单选题：
‏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】

Tests

1、单选题：
‍In ATM technology, cells are the basic unit of data transmission, and their length is:​
选项：
A: 43B
B: 5B
C: 48B
D: 53B
答案: 【 53B】

2、单选题：
‎Which is incorrect among the following descriptions of packet switching?‌
选项：
A: The datagram mode is flexible and fast
B: There are two mode of packet exchange: datagram mode and virtual circuit mode
C: The packet switching technology has high error rate of data transmission and low line utilization rate
D: The virtual circuit mode can establish several logical virtual circuits on one physical circuit, making users feel as if there are several physical links
答案: 【 The packet switching technology has high error rate of data transmission and low line utilization rate】

3、单选题：
‏What is the meaning of "asynchronous" in Asynchronous Transfer Mode (ATM) technology?‍
选项：
A: Adopts asynchronous serial communication technology
B: Adopts asynchronous control mode
C: Periodically inserts into ATM cells
D: Inserts into ATM cells at any time
答案: 【 Inserts into ATM cells at any time】

4、单选题：
‎Which is wrong among the following descriptions of T1 carrier?&