2020 数据通信与计算机通信网(Ⅰ)（李冬霞）(中国民航大学) 最新满分章节测试答案

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本课程起止时间为:2020-02-18到2021-07-10
本篇答案更新状态:已完结

【作业】第一部分 概述（Overview） （视频总时长130’24，19个视频） 课后作业1

1、 问题:2.2. a. The French and Chinese prime ministers need to come to an agreement by telephone, but neither speaks the other’s language. Further, neither has on hand a translator that can translate to the language of the other. However, both prime ministers have English translators on their staffs. Draw a diagram similar to Figure 2.15 to depict the situation, and describe the interaction at each level.
评分规则: 【 协议层次正确与否？
每层功能分配正确与否
英文表达是否准确？
】

2、 问题:2.2 b. Now suppose that the Chinese prime minister’s translator can translate only into Japanese and that the French prime minister has a German translator available. A translator between German and Japanese is available in Germany. Draw a new diagram that reflects this arrangement and describe the hypothetical phone conversation.
评分规则: 【 层次划分是否正确？
每层功能分配是否正确？
英文表达是否准确？
】

【作业】第一部分 概述（Overview） （视频总时长130’24，19个视频） 课后作业3

1、 问题:In Figure 2.5, exactly one protocol data unit (PDU) in layer N is encapsulated in a PDU at layer 1N – 12. It is also possible to break one N-level PDU into multiple 1N – 12-level PDUs (segmentation) or to group multiple N-level PDUs into one 1N – 12-level PDU (blocking).a. In the case of segmentation, is it necessary that each 1N – 12-level segment contain a copy of the N-level header?b. In the case of blocking, is it necessary that each N-level PDU retain its own header, or can the data be consolidated into a single N-level PDU with a single N-level header?
评分规则: 【 （a) is correct.
(b) is correct.
】

【作业】第一部分 概述（Overview） （视频总时长130’24，19个视频） 课后作业2

1、 问题:2.4. Two blue armies are each poised on opposite hills preparing to attack a single red army in the valley. The red army can defeat either of the blue armies separately but will fail to defeat both blue armies if they attack simultaneously. The blue armies communicate via an unreliable communications system (a foot soldier). The commander with one of the blue armies would like to attack at noon. His problem is this: If he sends a message to the other blue army, ordering the attack, he cannot be sure it will get through. He could ask for acknowledgment, but that might not get through. Is there a protocol that the two blue armies can use to avoid defeat?
评分规则: 【 Is there a protocol？Yes or No？
why?
】

【作业】第一部分 概述（Overview） （视频总时长130’24，19个视频） 课后作业1 重新提交

1、 问题:2.2. a. The French and Chinese prime ministers need to come to an agreement by telephone, but neither speaks the other’s language. Further, neither has on hand a translator that can translate to the language of the other. However, both primeministers have English translators on their staffs. Draw a diagram similar to Fig. 2.15 to depict the situation, and describe the interaction at each level.
评分规则: 【 协议层次正确与否？
每层功能分配正确与否
英文表达是否准确？
】

2、 问题:2.2 b. Now suppose that the Chinese prime minister’s translator can translate only into Japanese and that the French prime minister has a German translator available. A translator between German and Japanese is available in Germany. Draw a new diagram that reflects this arrangement and describe the hypothetical phone conversation.
评分规则: 【 协议层次正确与否？
每层功能分配正确与否
英文表达是否准确？
】

【作业】第一部分 概述（Overview） （视频总时长130’24，19个视频） 课后作业2重新提交

1、 问题:2.4. Two blue armies are each poised on opposite hills preparing to attack a single red army in the valley. The red army can defeat either of the blue armies separately but will fail to defeat both blue armies if they attack simultaneously. The blue armies communicate via an unreliable communications system (a foot soldier). The commander with one of the blue armies would like to attack at noon. His problem is this: If he sends a message to the other blue army, ordering the attack, he cannot be sure it will get through. He could ask for acknowledgment, but that might not get through. Is there a protocol that the two blue armies can use to avoid defeat?
评分规则: 【 Is there a protocol？Yes or No？
Why？
】

【作业】第一部分 概述（Overview） （视频总时长130’24，19个视频） 课后作业3重新提交

1、 问题:In Figure 2.5, exactly one protocol data unit (PDU) in layer N is encapsulated in a PDU at layer 1N – 12. It is also possible to break one N-level PDU into multiple 1N – 12-level PDUs (segmentation) or to group multiple N-level PDUs into one 1N – 12-level PDU (blocking). a. In the case of segmentation, is it necessary that each 1N – 12-level segment con[1]tain a copy of the N-level header? b. In the case of blocking, is it necessary that each N-level PDU retain its own header, or can the data be consolidated into a single N-level PDU with a single N-level header?
评分规则: 【 （a) is correct.
（b) is correct.
】

第一部分 概述（Overview） （视频总时长130’24，19个视频） 第一部分 单元测验

1、 问题:In OSI/RM architecture,the lowest is （ ）
选项：
A:application layer
B:network layer
C:transmission layer
D:physical layer
答案: 【physical layer】

2、 问题:In OSI/RM architecture, the first layer that provide end-to-end service from buttom to top is （ ）
选项：
A:network layer
B:transmission layer
C:data link layer
D:application layer
答案: 【transmission layer 】

3、 问题:In OSI/RM architecture,the function of physical layer is （ ）
选项：
A:data link access control and management
B:Transparently transmitting bitstreams
C:transmitting data frames between physical entities.
D:transmitting and receiving data message.
答案: 【Transparently transmitting bitstreams】

4、 问题:ARPANET is the predecessor of Internet，and it is a （ ）
选项：
A:circuit switching network
B:message switching network
C:packet switching network
D:hybrid switching network
答案: 【packet switching network】

5、 问题:Among the following options, that not described in the network architecture is ( )
选项：
A:the implementation details in protocol
B:networks layers
C: protocols used in each layer
D:the function of each layer
答案: 【the implementation details in protocol】

6、 问题:Syntax is one of the three features of protocol, it concerns （ ）
选项：
A:the format of data blocks.
B:the communication contents
C:control information for coordination and error handling
D:speed matching and sequencing
答案: 【the format of data blocks.】

7、 问题:In TCP/IP architecture, the PDU in network layer is（ ）
选项：
A:bit
B:frame
C:packet
D:character
答案: 【packet】

8、 问题:IP protocol is located in the ( ) of TCP/IP architecture.
选项：
A:application layer
B:transmission layer
C:internet layer
D:network access layer
答案: 【internet layer】

9、 问题:A computer network in a building belongs to （ ）
选项：
A:personal area network
B:LAN
C:MAN
D:WAN
答案: 【LAN】

10、 问题:A campus network belongs to （ ）
选项：
A:personal area network
B:LAN
C:MAN
D:WAN
答案: 【LAN】

11、 问题:Internet originated from （ ）
选项：
A:China
B:America
C:France
D:England
答案: 【America】

12、 问题:The main function of transmitter in data communications system is ( )
选项：
A:transmitting signal from source to destination
B:transmitting data from source to media
C:generating data to be transmitted
D:generating signal which is suitable to be transmitted in the communication system
答案: 【generating signal which is suitable to be transmitted in the communication system】

13、 问题:The basic unit of physical layer transmission is frame.
选项：
A:正确
B:错误
答案: 【错误】
分析：【物理层传输的基本单位是比特，数据链路层传输的基本单位是帧，因此是错误的。】

14、 问题:The basic unit of data link layer transmission is bit.
选项：
A:正确
B:错误
答案: 【错误】
分析：【数据链路层传输的基本单位是帧，而物理层传输的基本单位是比特，所以，该说法是错误的。】

15、 问题:In network architecture, service is a “vertical” concept.
选项：
A:正确
B:错误
答案: 【正确】
分析：【在分层的计算机网络体系结构中，下层是服务的提供者，上层是被服务的对象，所以，服务是一个垂直的概念。】

16、 问题:The key features of a protocol are syntax,semantics and timing.
选项：
A:正确
B:错误
答案: 【正确】
分析：【协议是指通信双方必须遵循的、控制信息交换的规则的集合，是一套语义和语法规则，一般说，一个网络协议主要由语法、语义和同步三个要素组成。分别规定了“怎么讲”，“讲什么”以及通信事件的执行顺序。】

17、 问题:In network architecture, a protocol is a set of rules or conventions that allow peer layers to communicate.
选项：