| 软件水平考试系统分析师易错题（2018/11/14） |
| 第1、2、3、4、5题：In the following essay, each bland has four choices.Choose the best answer and write down on the answer sheet. With the implementation of (6) the so – called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (7) interface between user(application)program, normally referred to ,as application processes, and the underlying communication services may be (8). For example, one computer may be a small single-user computer, while another may be a large (9) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s systems NetworkArchitecture (SNA、andDEC’sDigital NetworkArchitectureDNA、are just two examples of communication software packages produced by manufacturers to allow their systems to be intercormected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem,(10) ,in the late 1970s,formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.
(6) A、communicationchannel B、protocols C、datachannel D、publiccommunication (7) A、database B、datarepresentation C、protocols D、datacommunication (8) A、same B、similar C、different D、dependent (9) A、multi-user B、client C、server D、full-user (10) A、DNA B、SNA C、theOSI D、theISO |
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| 第6题：过原点做曲线y=ex的切线，则切线的方程为( )。
A、y=ex B、y=ex C、y=x D、y=ex/2 |
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| 第7、8题：两个公司希望通过Internet进行安全通信保证从信息源到目的地之间的数据传输以密文形式出现，而且公司不希望由于在传输节点使用特殊的安全单元而增加开支，最合适的加密方式是(1)，使用的会话密钥算法应该是(2)
(1) A、链路加密 B、节点加密 C、端—端加密 D、混合加密 (2) A、RSA B、RC—5 C、MD5 D、ECC |
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| 第9题：数据字典是数据流图中所有元素的定义的集合，一般由以下四类条目组成( )
A、数据说明条目、控制流条目、加工条目、数据存储条目 B、数据流条目、数据项条目、文件条目、加工条目 C、数据项条目、数据流条目、基本加工条目、数据存储条目 D、数据流条目、数据文件条目、数据池条目、加工条目 |
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| 第10题：目前已经提出的软件开发标准化的方案有( )
A、CORBA B、XML C、HTML D、PVCS |
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