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网页中常用的音频格式有哪些?
网络知识 | 2016/9/29 | 点击:3419

防火墙是什么有什么作用 “防火墙”是一种形象的说法, 其实它是一种由计算机硬件和软件的组合, 使互联网与内部网之间建立起一个安全网关( scurity gateway),从而保护内部网免受非法用户的侵入。所谓防火墙就是一个把互联网与内部网隔开的屏障。

  FANGHUOQIANGYOUERLEI: BIAOZHUNFANGHUOQIANGHESHUANGJIAWANGGUAN。BIAOZHUNFANGHUOQIANGXITONGBAOKUOYIGEUNIXGONGZUOZHAN, GAIGONGZUOZHANDELIANGDUANGEJIEYIGELUYOUQIJINXINGHUANCHONG。QIZHONGYIGELUYOUQIDEJIEKOUSHIWAIBUSHIJIE, JIGONGYONGWANG; LINGYIGEZELIANJIENEIBUWANG。BIAOZHUNFANGHUOQIANGSHIYONGZHUANMENDERUANJIAN,BINGYAOQIUJIAOGAODEGUANLISHUIPING,ERQIEZAIXINXICHUANSHUSHANGYOUYIDINGDEYANCHI。SHUANGJIAWANGGUAN(dual home gateway) ZESHIBIAOZHUNFANGHUOQIANGDEKUOCHONG,YOUCHENGBAOLEIZHUJI(bation host) HUOYINGYONGCENGWANGGUAN(applications layer gateway), TASHIYIGEDANGEDEXITONG, DANQUENENGTONGSHIWANCHENGBIAOZHUNFANGHUOQIANGDESUOYOUGONGNENG。QIYOUDIANSHINENGYUNXINGGENGFUZADEYINGYONG, TONGSHIFANGZHIZAIHULIANWANGHENEIBUXITONGZHIJIANJIANLIDERENHEZHIJIEDEBIANJIANG, KEYIQUEBAOSHUJUBAOBUNENGZHIJIECONGWAIBUWANGLUODAODANEIBUWANGLUO,FANZHIYIRAN。

  SUIZHEFANGHUOQIANGJISHUDEJINBU, SHUANGJIAWANGGUANDEJICHUSHANGYOUYANHUACHULIANGZHONGFANGHUOQIANGPEIZHI, YIZHONGSHIYINBIZHUJIWANGGUAN, LINGYIZHONGSHIYINBIZHINENGWANGGUAN( YINBIZIWANG)。YINBIZHUJIWANGGUANSHIDANGQIANYIZHONGCHANGJIANDEFANGHUOQIANGPEIZHI。GUMINGSIYI,ZHEIZHONGPEIZHIYIFANGMIANJIANGLUYOUQIJINXINGYINBI, LINGYIFANGMIANZAIHULIANWANGHENEIBUWANGZHIJIANANZHUANGBAOLEIZHUJI。BAOLEIZHUJIZHUANGZAINEIBUWANGSHANG, TONGGUOLUYOUQIDEPEIZHI, SHIGAIBAOLEIZHUJICHENGWEINEIBUWANGYUHULIANWANGJINXINGTONGXINDEWEIYIXITONG。MUQIANJISHUZUIWEIFUZAERQIEANQUANJIBIEZUISHANGDEFANGHUOQIANGSHIYINBIZHINENGWANGGUAN, TAJIANGWANGGUANYINZANGZAIGONGGONGXITONGZHIHOUSHIQIMIANZAOZHIJIEGONGJI。YINBIZHINENGWANGGUANTIGONGLEDUIHULIANWANGFUWUJINXINGJIHUTOUMINGDEFANGWEN, TONGSHIZUZHILEWAIBUWEISHOUQUANFANGWENZHEDUIZHUANYONGWANGLUODEFEIFAFANGWEN。YIBANLAISHUO, ZHEIZHONGFANGHUOQIANGSHIZUIBURONGYIBEIPOHUAIDE。

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