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1、2022年通信工程师-初级通信工程师考前模拟强化练习题（附答案详解）1. 单选题单模光纤的纤芯直径是（ ）。问题1选项A.9mB.50mC.62.5mD.125m【答案】A【解析】光纤的基本结构一般是双层或多层的同心圆柱体 。常用光纤的基本结构主要包括纤芯、包层、防护层。（1）纤芯。纤芯的折射率较高，用来传送光。单模光纤的直径小于10m，多模光纤的直径等于50m。（2）包层。包层的折射率较低，与纤芯一起形成全反射条件。（3）防护层。防护层要求强度大，能承受较大冲击，保护光纤。故本题选A。2. 单选题Months of staying at home have changed our lifes
2、tyles. Online activities have boomed during the epidemic, from telecommuting and online education to online shopping and remote medical services.For employees, especially white-collar workers, telecommuting tools such as video conferences and online office software make working from home more feasib
3、le. According to China Daily, Alibaba s all-in-one mobile workplace DingTalk has served more than 10 million enterprises and over 200 million people. Tencent Meeting can provide free use for over 300 participants per audio or video conference.Meanhile, likeDingTalk, many apps have been used by stude
4、nts and their teachers for online “Cloud platforms” have also been provided by the Ministry of Eaucation approach to continuing education among students across the country.Internet companies,such as NetEase, recently opened a full chain of contactless recruitment through online resume submission and
5、 online interviews. The candidates can also sign contracts, attend training workshops, and even begin work over the internet.Many museums and galleries in China have also been closed to visitors,but they have launched various online exhibitions to provide a creative touring experience for the countr
6、ys vast number of stay-at home visitors.According to the passage,（ ）can provide free use for over 300 participants per audio or video conference.问题1选项A.DingTalkB.Tencent MeetingC.WechatD.Tencent QQ【答案】B【解析】3. 单选题下列交换技术中，（ ）在呼叫连接建立后，即使无信息传送也需要占用信道。问题1选项A.电路交换B.软交换C.分组交换D.报文交换【答案】A【解析】电路交换是在通信网中任意两个或多
7、个用户终端之间建立电路暂时连接的交换方式，暂时连接独占一条电路并保持到连接释放为止。利用电路交换进行数据通信或电话通信必须经历建立电路阶段、传送数据或语音阶段和拆除电路阶段三个阶段。电路交换方式有以下几个特点。（1）电路交换是一种实时性交换，适用于实时（全程200ms）要求高的语音通信。（2）在通信前要通过呼叫为主、被叫用户建立一条物理连接。通信前建立的连接过程只要不释放，物理连接就永远保持。（3）电路交换是预分配带宽，在电路接通后，即使无信息传送也需要占用电路。（4）在传送信息时，没有任何差错控制措施，不利于传输要求可靠性高的突发性数据业务。故本题选A4. 单选题Months of stay
8、ing at home have changed our lifestyles. Online activities have boomed during the epidemic, from telecommuting and online education to online shopping and remote medical services.For employees, especially white-collar workers, telecommuting tools such as video conferences and online office software
9、make working from home more feasible. According to China Daily, Alibaba s all-in-one mobile workplace DingTalk has served more than 10 million enterprises and over 200 million people. Tencent Meeting can provide free use for over 300 participants per audio or video conference.Meanhile, likeDingTalk,
10、 many apps have been used by students and their teachers for online “Cloud platforms” have also been provided by the Ministry of Eaucation approach to continuing education among students across the country.Internet companies,such as NetEase, recently opened a full chain of contactless recruitment th
11、rough online resume submission and online interviews. The candidates can also sign contracts, attend training workshops, and even begin work over the internet.Many museums and galleries in China have also been closed to visitors,but they have launched various online exhibitions to provide a creative
12、 touring experience for the countrys vast number of stay-at home visitors.What is the main idea of this passage（ ）?问题1选项A.Adapting to remote workingB.Staying at homeC.Epidemic situationD.Peoples life is not convenient【答案】A【解析】5. 单选题在SDN中，（ ）负责SDN控制器与网络单元之间的数据交换和交互操作。问题1选项A.北向接口B.西向接口C.南向接口D.东向接口【答案】
13、C【解析】SDN定义了两个接口：南向接口和北向接口。南向接口：位于数据平面和控制平面之间的接口，负责 SDN 控制器与网络单元之间的数据交换和交互操作。北向接口：位于控制平面与应用平面之间的接口，上层的应用程序通过北向接口获取下层的网络资源，并通过北向接口向下层网络发送数据。6. 单选题（ ）是一种实时性交换，适用于实时要求高的语音通信。问题1选项A.电路交换B.报文交换C.分组交换D.软交换【答案】A【解析】电路交换是在通信网中任意两个或多个用户终端之间建立电路暂时连接的交换方式，暂时连接独占一条电路并保持到连接释放为止。利用电路交换进行数据通信或电话通信必须经历建立电路阶段、传送数据或语音
14、阶段和拆除电路阶段三个阶段。电路交换方式有以下几个特点。（1）电路交换是一种实时性交换，适用于实时（全程200ms）要求高的语音通信。（2）在通信前要通过呼叫为主、被叫用户建立一条物理连接。通信前建立的连接过程只要不释放，物理连接就永远保持。（3）电路交换是预分配带宽，在电路接通后，即使无信息传送也需要占用电路。（4）在传送信息时，没有任何差错控制措施，不利于传输要求可靠性高的突发性数据业务。故本题选A7. 单选题利用信息通信技术以及互联网平台，让互联网与传统行业进行深度融合，这种应用模式称为（ ）。问题1选项A.物联网B.大数据C.云计算D.互联网+【答案】D【解析】互联网+的含义就是要充分
15、发挥互联网在生产要素配置中的优化和集成作用，把互联网的创新成果与经济社会各领域深度融合，产生化学反应、放大效应，大力提升实体经济的创新力和生产力，形成更广泛的以互联网为基础设施和实现工具的经济发展新形态。8. 单选题在有线接入技术中，（ ）技术是基于普通电话线的宽带接入技术，它在同一铜线上同时传送数据和语音信号。问题1选项A.DSLB.EPONC.FTTxD.GPON【答案】A【解析】数字用户环路（DSL）技术是基于普通电话线的宽带接入技术，它在同一铜线上分别传送数据和语音信号，数据信号并不通过电话交换机设备，减轻了电话交换机的负载:并且不需要拨号且一直在线，属于专线上网方式。9. 单选题在同步网中，同步是指信号之间频率或（ ）上保持某种严格的特定关系。问题1选项A.幅度B.相位C.速率D.带宽【答案】B【解析】广义地来
