2021软件水平考试考试真题卷(2).docx
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1、2021软件水平考试考试真题卷(2)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.A transport layer protocol usually has several responsibilitiesOne is to create a process-to-process communication;UDP uses (1) numbers to accomplish thisAnother responsibility is to provide control mechani
2、sms at the transport levelUDP does this task at a very minimal levelThere is no flow control mechanism and there is no(2) for received packetUDP, however, does provide error control to some extentIf UDP detects an error in the received packet,it will silently drop it The transport layer also provide
3、s a connection mechanism for the processesThe (3) must be able to send streams of data to the transport layerIt is the responsibility of the transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units,number them,and send them one by oneIt is the
4、 responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived,check and pass those that are (5) free, and deliver them to the receiving process as a stream(1)处应填()。AhopBportCrouteDpacket2.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,各个阶段都要产
5、生相应的文档,以下选项中,(1)属于逻辑网络设计文档,(2)属于物理网络设计文档。(2)处应填()。A网络IP 地址分配方案B设备列表清单C集中访谈的信息资料D网络内部的通信流量分布3.以太网介质访问控制策略可以采用不同的监听算法,其中一种是:一旦介质空闲就发送数据,假如介质忙,继续监听,直到介质空闲后立即发送数据,这种算法称为(1)监听算法,该算法的主要特点是(2)。(2)处应填()。A介质利用率和冲突概率都低B介质利用率和冲突概率都高C介质利用率低且无法避免冲突D介质利用率高且可以有效避免冲突4.A transport layer protocol usually has several
6、responsibilitiesOne is to create a process-to-process communication;UDP uses (1) numbers to accomplish thisAnother responsibility is to provide control mechanisms at the transport levelUDP does this task at a very minimal levelThere is no flow control mechanism and there is no(2) for received packet
7、UDP, however, does provide error control to some extentIf UDP detects an error in the received packet,it will silently drop it The transport layer also provides a connection mechanism for the processesThe (3) must be able to send streams of data to the transport layerIt is the responsibility of the
8、transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units,number them,and send them one by oneIt is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived,
9、check and pass those that are (5) free, and deliver them to the receiving process as a stream(2)处应填()。AconnectionBwindowCacknowledgementDdestination5.配置路由器时,PC 机的串行口与路由器的(1)相连,路由器与PC 机串行口通信的默认数据速率为(2)。(2)处应填()。A2400b/sB4800b/sC9600b/sD10Mb/s6.A transport layer protocol usually has several responsibi
10、litiesOne is to create a process-to-process communication;UDP uses (1) numbers to accomplish thisAnother responsibility is to provide control mechanisms at the transport levelUDP does this task at a very minimal levelThere is no flow control mechanism and there is no(2) for received packetUDP, howev
11、er, does provide error control to some extentIf UDP detects an error in the received packet,it will silently drop it The transport layer also provides a connection mechanism for the processesThe (3) must be able to send streams of data to the transport layerIt is the responsibility of the transport
12、layer at (4) station to make the connection with the receiver, chop the stream into transportable units,number them,and send them one by oneIt is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived,check and
13、pass those that are (5) free, and deliver them to the receiving process as a stream(3)处应填()。AjobsBprocessesCprogramsDusers7.A transport layer protocol usually has several responsibilitiesOne is to create a process-to-process communication;UDP uses (1) numbers to accomplish thisAnother responsibility
14、 is to provide control mechanisms at the transport levelUDP does this task at a very minimal levelThere is no flow control mechanism and there is no(2) for received packetUDP, however, does provide error control to some extentIf UDP detects an error in the received packet,it will silently drop it Th
15、e transport layer also provides a connection mechanism for the processesThe (3) must be able to send streams of data to the transport layerIt is the responsibility of the transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units,number them,and
16、 send them one by oneIt is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived,check and pass those that are (5) free, and deliver them to the receiving process as a stream(4)处应填()。AsendingBroutingCswitchingD
17、receiving8.A transport layer protocol usually has several responsibilitiesOne is to create a process-to-process communication;UDP uses (1) numbers to accomplish thisAnother responsibility is to provide control mechanisms at the transport levelUDP does this task at a very minimal levelThere is no flo
18、w control mechanism and there is no(2) for received packetUDP, however, does provide error control to some extentIf UDP detects an error in the received packet,it will silently drop it The transport layer also provides a connection mechanism for the processesThe (3) must be able to send streams of d
19、ata to the transport layerIt is the responsibility of the transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units,number them,and send them one by oneIt is the responsibility of the transport layer at the receiving end to wait until all the d
20、ifferent units belonging to the same process have arrived,check and pass those that are (5) free, and deliver them to the receiving process as a stream(5)处应填()。AcallBstateCcostDerror9.进程Pl、P2、P3、P4和P5的前趋图如下:若用PV操作控制进程P1P5并发执行的过程,则需要设置5个信号量S1、S2、S3、S4和S5,进程间同步所使用的信号量标注在上图中的边上,且信号量S1S5的初值都等于零,初始状态下进程P
21、1 开始执行。下图中a、b和c处应分别填写(2);d和e处应分别填写(3),f和g处应分别填写(4)。(2)处应填()。AV(S1)V(S2)、P(S1)和v(S3)V(S4)BP(S1)V(S2)、P(S1)和P(S2)V(S1)CV(S1)V(S2)、P(S1)和P(S3)P(S4)DP(S1)P(S2)、V(S1)和P(S3)V(S2)10.进程Pl、P2、P3、P4和P5的前趋图如下:若用PV操作控制进程P1P5并发执行的过程,则需要设置5个信号量S1、S2、S3、S4和S5,进程间同步所使用的信号量标注在上图中的边上,且信号量S1S5的初值都等于零,初始状态下进程P1 开始执行。下图
22、中a、b和c处应分别填写(2);d和e处应分别填写(3),f和g处应分别填写(4)。(3)处应填()。AP(S1)和V(S5)BV(S1)和P(S5)CP(S2)和V(S5)DV(S2)和P(S5)11.进程Pl、P2、P3、P4 和P5 的前趋图如下:若用PV 操作控制进程P1P5 并发执行的过程,则需要设置5 个信号量S1、S2、S3、S4和S5,进程间同步所使用的信号量标注在上图中的边上,且信号量S1S5 的初值都等于零,初始状态下进程P1 开始执行。下图中a、b 和c 处应分别填写(2);d 和e 处应分别填写(3),f和g 处应分别填写(4)。(4)处应填()。AP(S3)和V(S4
23、)V(S5)BP(S3)和P(S4)P(S5)CV(S3)和V(S4)V(S5)DV(S3)和P(S4)P(S5)12.某企业工程项目管理数据库的部分关系模式如下图所示,其中带实下划线的表示主键,虚下划线的表示外键其中供应关系是(5)的联系。若一个工程项目可以有多个员工参加,每个员工可以参加多个项目,则项目和员工之间是(6)联系。对项目和员工关系进行设计时,(7)设计成一个独立的关系模式。(5)处应填()。A2个实体之间的1:nB2个实体之间的n:mC3个实体之间的1:n:mD3个实体之间的k:n:m13.某企业欲对内部的数据库进行数据集成。如果集成系统的业务逻辑较为简单,仅使用数据库中的单表
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