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18.
物理安全主要包括机房安全、
_________
安全、设备安全和电源安全。
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4.在计算机网络的供电系统中使用UPS电源的主要目的是( )
21.代理服务(Proxy)技术是一种较新型的防火墙技术,它分为_______网关和电路 层网关。
31·简述计算机病毒的逻辑结构。
简述CSMA/CD的工作方式。
33.某企业网的网络拓扑结构如下图所示,其中防火墙采用了网络卫士防火墙3000,防火墙工作于路由和透明混合的综合模式,分配给防火墙3个接口(EO、E1、E2)的IP地址、边界路由器接口的IP地址、服务器和工作站的子网地址亦如图所标示。请写出防火墙各接口(地址、属性)和路由表的配置命令。(可使用命令:ifconfig、fwip、route)
TCP协议在功能上对应于OSI参考模型中的_____层。
28.写出在误用检测的技术实现中,常见的五种方法。
13.恶意代码的特征有三种,它们是( )
l5.下列网络系统安全原则,错误的是( )
19.密码体制从原理上可分为两大类,即单钥密码体制和__________。
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- Would you like to go to the concert with us this evening?- ________
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心电图反映两心室除极过程的波为( )
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23.It was the tail end of the depression, and things were tough. Mum had a hard time raising us kids on her own in our small community of New Westminster, BC. My Dad had drowned in PittLake, five years earlier. Because Dad had no pension, or benefits, there was not much money so we went on relief. Christmas was approaching, and we were entitled to a twenty-five dollar Christmas fund for social services. The Inspector came to our house, and searched it from top to bottom to be sure we didn’t have any food hidden away. When he didn't find any, he issued the cheque for Mum. It was four days before Christmas, and Mum said that instead of buying food, she would use the money to pay back rent, assuring us all of a roof over our heads for a little while longer. She told us then there would be nothing for Christmas. Unknown to Mum, I had been selling Christmas trees, shoveling snow, and doing odd jobs to earn enough money to buy a new pair of boots. My mind was made up and I realized what I had to do. Across the street from the bus stop was a big grocery store called the Piggly Wiggley. Into the store I went, brimming with happiness and excitement. I realized that the twenty-five dollars I had worked so hard for went a long way for groceries. I bought a turkey, ham, oranges and all the Christmas treats. I spent every dime of my hard-earned money. I quietly unloaded the groceries on the porch and piled them against the door, then I knocked on the door. I could hardly wait to see my mother's face! When Mum opened the door, some of the groceries fell inside onto the floor, and she just stood there dumbfounded. Holding back the tears, I hollered, “Merry Christmas Mother!! There really is a Santa Claus!”(10分)23.1 What happened to my father?(2分)A. He deserted us five years ago.B. He left Pitt Lake five years ago.C. He left Pitt Lake five years ago.D. He divorced my mother five years ago.
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25.我国最高国家行政机关是【 】
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试述文学风格的特征。
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