2021年云南软件水平考试考试考前冲刺卷(1).docx

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1、2021年云南软件水平考试考试考前冲刺卷(1)本卷共分为1大题50小题,作答时间为180分钟,总分100分,60分及格。一、单项选择题(共50题,每题2分。每题的备选项中,只有一个最符合题意) 1.网络设计过程包括逻辑网络设计和物理网络设计两个阶段,每个阶段都要产生相应的文档。以下选项中,()属于逻辑网络设计文档,()属于物理网络设计文档。以下选项中,()属于逻辑网络设计文档。A网络IP地址分配方案B设备列表清单C几种访谈的信息资料D网络内部通信的流量分析2.建筑物综合布线系统的干线子系统(),水平子系统()建筑物综合布线系统的干线子系统()A各个楼层接线间配线架到工作区信息插座之间所安装的线

2、缆B由终端到信息插座之间的连线系统C各楼层设备之间的互联系统D连接各个建筑物的通信系统3.Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of () . This, in turn, limits the data rate that can be carried on the transmission ()

3、 . A square wave has an infinite number of frequency components and hence an infinite () .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the () in this waveform is in the first few frequency components. In general, any digital waveform will have () bandwidth.

4、 If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a l

5、imited band of () .AfrequenciesBconnectionsCdiagramsDresources4.Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of () . This, in turn, limits the data rate that can be carried on

6、the transmission () . A square wave has an infinite number of frequency components and hence an infinite () .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the () in this waveform is in the first few frequency components. In general, any digital waveform will

7、 have () bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.This, in turn, limits the data rate that can be carried on the transmission()AproceduresBfunctionCrouteDmedium5.下图表示一个局域网的互联拓扑,方框中的数字是网桥ID

8、,用字母来区分不同的网段。按照IEEE802.1d协议,ID为()的网桥被选为根网桥,如果所有网段的传输费用为1,则ID为92的网桥连接网段()的端口为根端口。如果所有网段的传输费用为1,则ID为92的网桥连接网段()的端口为根端口。AaBbCdDe6.建筑物综合布线系统的干线子系统(),水平子系统()水平子系统()A各个楼层接线间配线架到工作区信息插座之间所安装的线缆B由终端到信息插座之间的连线系统C各楼层设备之间的互联系统D连接各个建筑物的通信系统7.网络设计过程包括逻辑网络设计和物理网络设计两个阶段,每个阶段都要产生相应的文档。以下选项中,()属于逻辑网络设计文档,()属于物理网络设计文

9、档。()属于物理网络设计文档。A网络IP地址分配方案B设备列表清单C几种访谈的信息资料D网络内部通信的流量分析8.Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of () . This, in turn, limits the data rate that can be carried on the tra

10、nsmission () . A square wave has an infinite number of frequency components and hence an infinite () .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the () in this waveform is in the first few frequency components. In general, any digital waveform will have (

11、) bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.A square wave has an infinite number of frequency components and hence an infinite()AsourceBbandwidthCenergyDcost9.Although a given waveform may

12、contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of () . This, in turn, limits the data rate that can be carried on the transmission () . A square wave has an infinite number of frequency components and hence a

13、n infinite () .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the () in this waveform is in the first few frequency components. In general, any digital waveform will have () bandwidth. If we attempt to transmit this waveform as a signal over any medium, the t

14、ransmission system will limit the bandwidth that can be transmitted.so most of the () in this waveform is in the first few frequency components.AfrequencyBenergyCamplitudeDphase10.Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system

15、 will be able to accommodate only a limited band of () . This, in turn, limits the data rate that can be carried on the transmission () . A square wave has an infinite number of frequency components and hence an infinite () .However, the peak amplitude of the kth frequency component, kf, is only 1/k

16、, so most of the () in this waveform is in the first few frequency components. In general, any digital waveform will have () bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.any digital waveform w

17、ill have () bandwidth.AsmallBlimitedCinfiniteDfinite11.一台PC机通过调制解调器与另一台PC机进行数据通信,其中PC机属于(),调制解调器属于()。调制解调器的数据传送方式为()。一台PC机通过调制解调器与另一台PC机进行数据通信,其中PC机属于()A输入和输出设备B数据复用设备C数据终端设备DTED数据通信设备DCE12.若每一条指令都可以分解为取指、分析和执行三步。已知取指时间t取指5t,分析时间t分析2t,执行时间t执行5t。如果按顺序方式从头到尾执行500条指令需()t。如果按照执行k、分析k1、取指k2重叠的流水线方式执行指令,从

18、头到尾执行500条指令需()t。如果按顺序方式从头到尾执行500条指令需()t。A5590B5595C6000D600713.设有一个关系Student(学号,姓名,系名,课程号,成绩),查询至少选修了四门课程的学生学号、姓名及平均成绩的SELECT 语句应该是: SELECT 学号,姓名,AVG(成绩) AS 平均成绩 FROM Student GROUP BY () HAVING ()FROM Student GROUP BY ()A学号B姓名C系名D课程号14.通过局域网连接Internet,需要设置TCP/IP协议的属性。对于固定IP的配置需要指定3个地址,即本机地址,(1)地址和(2

19、)的地址。(1)处应选择()A默认网关B交换机CTCP服务器D远程访问服务器15.在关系代数运算中,关系S、SP 和R 如下表所示。() ,可以从S 和SP 获得R。其对应的关系表达式为() 。如下的SQL 语句可以查询销售总量大于1000 的部门名。 Select 部门名 From S Where 部门号 in(Select 部门号 From SP Group by () )。(),可以从S和SP获得R。A若先对S 进行选择运算,再与SP 进行自然连接运算B若先对S 进行选择运算,再与SP 进行自然连接运算,最后进行投影运算C若先对S 和SP 进行笛卡儿积运算,再对运算的结果进行投影运算D若

20、先分别对S 和SP 进行投影运算,再对运算的结果进行笛卡儿积运算16.一台PC机通过调制解调器与另一台PC机进行数据通信,其中PC机属于(),调制解调器属于()。调制解调器的数据传送方式为()。调制解调器属于()A输入和输出设备B数据复用设备C数据终端设备DTED数据通信设备DCE17.()的任务是根据系统说明书中规定的功能要求,具体设计实现逻辑模型的技术方案,这个阶段形成的技术文档是()。()的任务是根据系统说明书中规定的功能要求。A系统分析阶段B系统规划阶段C系统实施阶段D系统设计阶段18.ADSL对应的中文术语是(),它的两种Internet接入方式是()接入。ADSL对应的中文术语是(

21、)A分析数字系统层B非对称数字线C非对称数字用户线D异步数字系统层19.在下面网络图中,节点4的最早开始时间是(),关键路径是()。在下面网络图中,节点4的最早开始时间是()A2B3C6D820.ADSL对应的中文术语是(),它的两种Internet接入方式是()接入。它的两种Internet接入方式是()接入。A固定接入和虚拟拨号B专线接入和VLANC固定接入和VLAND专线接入和虚拟拨号21.若每一条指令都可以分解为取指、分析和执行三步。已知取指时间t取指5t,分析时间t分析2t,执行时间t执行5t。如果按顺序方式从头到尾执行500条指令需()t。如果按照执行k、分析k1、取指k2重叠的流

22、水线方式执行指令,从头到尾执行500条指令需()t。如果按照执行k、分析k1、取指k2重叠的流水线方式执行指令,从头到尾执行500条指令需()t。A2492B2500C2510D251522.()的任务是根据系统说明书中规定的功能要求,具体设计实现逻辑模型的技术方案,这个阶段形成的技术文档是()。这个阶段形成的技术文档是()。A需求建议书B系统设计说明书C系统维护手册D系统测试分析报告23.通过局域网连接Internet,需要设置TCP/IP协议的属性。对于固定IP的配置需要指定3个地址,即本机地址,(1)地址和(2)的地址。(2)处应选择()AWeb 服务器B文件服务器C邮件服务器DDNS

23、服务器24.设有一个关系Student(学号,姓名,系名,课程号,成绩),查询至少选修了四门课程的学生学号、姓名及平均成绩的SELECT 语句应该是: SELECT 学号,姓名,AVG(成绩) AS 平均成绩 FROM Student GROUP BY () HAVING ()HAVING ()ACOUNT(DISTINCT 学号)3BCOUNT(课程号)3CCOUNT(DISTINCT 学号)=3DCOUNT(课程号)=325.一台PC机通过调制解调器与另一台PC机进行数据通信,其中PC机属于(),调制解调器属于()。调制解调器的数据传送方式为()。调制解调器的数据传送方式为()A频带传输B

24、数字传输C基带传输DIP 传输26.在关系代数运算中,关系S、SP 和R 如下表所示。() ,可以从S 和SP 获得R。其对应的关系表达式为() 。如下的SQL 语句可以查询销售总量大于1000 的部门名。 Select 部门名 From S Where 部门号 in(Select 部门号 From SP Group by () )。其对应的关系表达式为()A.B.C.D.27.在下面网络图中,节点4的最早开始时间是(),关键路径是()。在下面网络图中,关键路径是()A→→→B→→→C→→→D→

25、→→→28.下面的程序段中,() 是语句覆盖测试用例,() 是判定覆盖测试用例。 if (a1000B部门号 having sum(数量)1000C商品号 where sum(数量)1000D商品号 having sum(数量)100030.MIDI enables people to use () computers and electronic musical instruments. There are actually three components to MIDI, the communications () , the Hardware interf

26、ace and a distribution () called Standard MIDI Files. In the context of the WWW, the most interesting component is the () Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol () are stored in MIDI files, the events are also time-stamped for playba

27、ck in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.MIDI enables people to use () computers and electronic musical instruments.ApersonalBelectronicCmultimediaDnetwork31.Certificates are () documents attesting to the () of a public key to an individual or oth

28、er entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to () someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also c

29、ontains an () date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital () of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any appl

30、ication complying with X.509.Certificates are ()AtextBdataCdigitalDstructured32.下面的程序段中,() 是语句覆盖测试用例,() 是判定覆盖测试用例。 if (a ServerName DocumentRoot /www/othertest ServerName (55) DocumentRoot /www/otherdate ServerName ServerAlias * DocumentRoot /www/test 55()ABCD47.在Windows 中运行(53)命令后得到如下图所示的结果,该命令的作用是

31、(54)。54()A查看当前TCP/IP 配置信息B测试与目的主机的连通性C显示当前所有连接及状态信息D查看当前DNS 服务器48.某Apache 服务器的配置文件httpd.conf 包含如下所示配置项。在(55)处选择合适的选项,使得用户可通过 访问到该Apache 服务器;当用户访问http:/111.25.4.30:80 时,会访问到(56) 虚拟主机。 NameVirtualHost 111.25.4.30: 80 ServerName DocumentRoot /www/othertest ServerName (55) DocumentRoot /www/otherdate Se

32、rverName ServerAlias * DocumentRoot /www/test 56()ABCD49.实现 VPN 的关键技术主要有隧道技术、加解密技术、(63) 和身份认证技术。如果需要在传输层实现VPN,可选的协议是(64) 。63()A入侵检测技术B病毒防治技术C安全审计技术D密钥管理技术50.活动目录(Active Directory)是由组织单元、域、(59) 和域林构成的层次结构,安装活动目录要求分区的文件系统为(60) 。59()A超域B域树C团体D域控制器第19页 共19页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页第 19 页 共 19 页

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