Warning: Use of undefined constant title - assumed 'title' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 152 什么是ICF防火墙 ICF防火墙知识
- 分类：win7 发布时间： Warning: Use of undefined constant newstime - assumed 'newstime' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 156 2013年03月21日 00:00:00
一、什么是防火墙
XP系统相当于以往的Windows系统新增了许多的网络功能，例如Internet连接防火墙（ICF），它就是用一段"代码墙"把电脑和Internet分隔开，时刻检查出入防火墙的所有数据包，决定拦截或是放行那些数据包。防火墙可以是一种硬件、固件或者软件，例如专用防火墙设备、就是硬件形式的防火墙，包过滤路由器是嵌有防火墙固件的路由器，而代理服务器等软件就是软件形式的防火墙。
二、 防火墙的种类
防火墙从诞生到现在，已经历了四个发展阶段：基于路由器的防火墙、用户化的防火墙工具套、建立在通用操作系统上的防火墙、具有安全操作系统的防火墙。目前常见的防火墙属于具有安全操作系统的防火墙，例如NETEYE、NETSCREEN、TALENTIT等。
从结构上来分，防火墙有两种：即代理主机结构和路由器+过滤器结构，后一种结构如下所示：内部网络过滤器(Filter)路由器(Router)Internet
从原理上来分，防火墙则可以分成4种类型：特殊设计的硬件防火墙、数据包过滤型、电路层网关和应用级网关。安全性能高的防火墙系统都是组合运用多种类型防火墙，构筑多道防火墙“防御工事”。
三、ICF工作原理
ICF被视为状态防火墙，状态防火墙可监视通过其路径的所有通讯，并且检查所处理的每个消息的源和目标地址。为了防止来自连接公用端的未经请求的通信进入专用端，ICF保留了所有源自ICF计算机的通讯表。在单独的计算机中，ICF将跟踪源自该计算机的通信。与ICS一起使用时，ICF将跟踪所有源自ICF/ICS计算机的通信和所有源自专用网络计算机的通信。所有Internet传入通信都会针对于该表中的各项进行比较。只有当表中有匹配项时（这说明通讯交换是从计算机或专用网络内部开始的），才允许将传入Internet通信传送给网络中的计算机。
源自外部源ICF计算机的通讯（如Internet）将被防火墙阻止，除非在“服务”选项卡上设置允许该通讯通过。ICF不会向你发送活动通知，而是静态地阻止未经请求的通讯，防止像端口扫描这样的常见黑客袭击。
责任编辑：u.zhuangjbia.com 版权所有，转载请说明出处！
上一篇：
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 211
Warning: Use of undefined constant tbname - assumed 'tbname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 211
Warning: Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 212
Warning: Use of undefined constant title - assumed 'title' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 217
导致电脑硬盘故障元凶
下一篇：
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 222
Warning: Use of undefined constant tbname - assumed 'tbname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 222
Warning: Use of undefined constant id - assumed 'id' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 223
Warning: Use of undefined constant title - assumed 'title' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 228
WIN7系统安装失败的三大原因
猜您喜欢
- 如何查看电脑配置2019/06/18
- 怎么使用联想电脑一键恢复,详细教您怎..2017/12/13
- 深度技术win7镜像64位纯净版下载..2021/10/29
- win7消除弹窗广告怎么操作2021/06/11
- adb驱动安装教程2024/10/19
- 详细教您添加桌面快捷方式..2018/10/29
相关推荐
-
Warning: Use of undefined constant islast - assumed 'islast' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 296
Warning: Use of undefined constant tbname - assumed 'tbname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 305
Warning: Use of undefined constant modid - assumed 'modid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 306
Warning: Use of undefined constant yhid - assumed 'yhid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 307
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673
Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673
Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418
Warning: Use of undefined constant wburl - assumed 'wburl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423
Warning: Use of undefined constant listdt - assumed 'listdt' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428
Warning: Use of undefined constant classurl - assumed 'classurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428
Warning: Use of undefined constant newsurl - assumed 'newsurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434
Warning: Use of undefined constant classpath - assumed 'classpath' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436
Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436
Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439
Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439
- 处理笔记本电脑如何重装win7.. 2019-05-16 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant wburl - assumed 'wburl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant listdt - assumed 'listdt' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant classurl - assumed 'classurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant newsurl - assumed 'newsurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classpath - assumed 'classpath' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439
- 小编教你解决win7无法保存打印机设置.. 2017-10-26 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant wburl - assumed 'wburl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant listdt - assumed 'listdt' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant classurl - assumed 'classurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant newsurl - assumed 'newsurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classpath - assumed 'classpath' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439
- Win7怎么分区：详细步骤与注意事项解析.. 2024-08-22 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant wburl - assumed 'wburl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant listdt - assumed 'listdt' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant classurl - assumed 'classurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant newsurl - assumed 'newsurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classpath - assumed 'classpath' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439
- 电脑教程:win7怎么还原打开方式.. 2017-10-28 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant wburl - assumed 'wburl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant listdt - assumed 'listdt' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant classurl - assumed 'classurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant newsurl - assumed 'newsurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classpath - assumed 'classpath' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439
- 如何恢复qq聊天记录,详细教您qq聊天记.. 2018-04-03 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/t_functions.php on line 673 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant wburl - assumed 'wburl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2418 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant listdt - assumed 'listdt' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2423 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant classurl - assumed 'classurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2428 Warning: Use of undefined constant newsurl - assumed 'newsurl' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classpath - assumed 'classpath' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2434 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2436 Warning: Use of undefined constant classid - assumed 'classid' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439 Warning: Use of undefined constant bname - assumed 'bname' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/class/connect.php on line 2439
- 宽带连接错误711,详细教您宽带连接错.. 2018-06-04
