● ADSL是一种宽带接入技术，这种技术使用的传输介质是 （66） 。

（66）

● Internet上的DNS服务器中保存有 （70） 。

（70）

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

（71）

● 下面的选项中，属于本地回路地址的是 （68） 。

（68）

● 下面关于防火墙说法正确的是 （69） 。

（69）

● ADSL是一种宽带接入技术，这种技术使用的传输介质是 （66） 。

（66）

● 下面关于网络系统设计原则的论述中，正确的是 （67） 。

（67）

● TCP/IP 在多个层引入了安全机制，其中TLS 协议位于 （64） 。

（64）

● 为了防止电子邮件中的恶意代码，应该用 （63） 方式阅读电子邮件。

（63）

● 下列Internet应用中，传输层需要采用UDP 协议的是 （65） 。

（65）

● RTCP 网络协议的作用是 （61） 。

（61）