● Internet上的DNS服务器中保存有 （70） 。

试卷相关题目

• 1● 下面关于防火墙的说法，正确的是 （69） 。

  A.防火墙一般由软件以及支持该软件运行的硬件系统构成

  B.防火墙只能防止未经授权的信息发送到内网

  C.防火墙能准确地检测出攻击来自哪一台计算机

  D.防火墙的主要支撑技术是加密技术

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• 2● 下面的选项中，属于本地回路地址的是 （68） 。

  A.120.168.10.1

  B.10.128.10.1

  C.127.0.0.1

  D.172.16.0.1

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• 3● 下面关于网络系统设计原则的叙述，正确的是 （67） 。

  A.应该尽量采用先进的网络设备，获得最高的网络性能

  B.网络总体设计过程中，只需要考虑近期目标即可，不需要考虑扩展性

  C.网络系统应采用开放的标准和技术

  D.网络需求分析独立于应用系统的需求分析

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• 4● ADSL是一种宽带接入技术，这种技术使用的传输介质是  （66）  。

  A.电话线

  B.CATV电缆

  C.基带同轴电缆

  D.无线通信网

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• 5● 某主机的IP地址为202.117.131.12/20，其子网掩码是 （65） 。

  A.255.255.248.0

  B.255.255.240.0

  C.255.255.252.0

  D.255.255.255.0

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• 6● It should go without saying that the focus of UML is modeling. However, what thatmeans, exactly, can be an open-ended question. （71）is a means to capture ideas, relationships,decisions, and requirements in a well-defined notation that can be applied to many differentdomains. Modeling not only means different things to different people, but also it can usedifferent pieces of UML depending on what you are trying to convey. In general, a UML modelis made up of one or more （72）. A diagram graphically represents things, and the relationshipsbetween these things. These （73）can be representations of real-world objects, pure softwareconstructs, or a description of the behavior of some other objects. It is common for an individualthing to show up on multiple diagrams; each diagram represents a particular interest, or view, ofthe thing being modeled. UML 2.0 divides diagrams into two categories: structural diagramsand behavioral diagrams. （74）are used to capture the physical organization of the things inyour system, i.e., how one object relates to another. （75）focus on the behavior of elements in asystem. For example, you can use behavioral diagrams to capture requirements, operations, andinternal state changes for elements.

  A.Programming

  B.Analyzing

  C.Designing

  D.Modeling

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