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class="button">聯(lián)系我們</a></div></div><div id="a8pjv3q" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">浙江越昕信息技術有限公司</a></p><p><span>聯(lián)系人：</span>戴偉強</p><p><span>郵箱: </span>dwq@shpanabit.com</p><p><span>電話: </span>13917159624</p><p><span>傳真: </span>021_</p><p><span>網址: </span>http://www.yuexininfo.com</p><p><span>手機: </span>021-80370549</p><p><span>地址: </span>長經濟技術開發(fā)區(qū)高鐵路669號國家大學科技園12號樓228室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="o2ya7bq" class="page-proshow02"><p class="title">詳細說明</p><div id="3h3rahy" class="box"><p><p style="text-indent:25px"> 我們通常所說的網絡防火墻是借鑒了古代真正用于防火的防火墻的喻義，它指的是隔離在本地網絡與外界網絡之間的一道防御系統(tǒng)。防火可以使企業(yè)內部局域網（LAN）網絡與Internet之間或者與其他外部網絡互相隔離、限制網絡互訪用來保護內部網絡。內部網絡和外部網絡之間的所有網絡數據流都必須經過防火墻，龍巖防火墻廠家。這是防火墻所處網絡位置特性，同時也是一個前提。因為只有當防火墻是內、外部網絡之間通信的通道，才可以多方面、有效地保護企業(yè)網部網絡不受侵害。根據美國安全的部門門制定的《信息保障技術框架》，防火墻適用于用戶網絡系統(tǒng)的邊界，屬于用戶網絡邊界的安全保護設備。所謂網絡邊界即是采用不同安全策略的兩個網絡連接處，比如用戶網絡和互聯(lián)網之間連接、和其它業(yè)務往來單位的網絡連接、用戶內部網絡不同部門之間的連接等。防火墻的目的就是在網絡連接之間建立一個安全控制點，通過允許、拒絕或重新定向經過防火墻的數據流，龍巖防火墻廠家，實現對進，龍巖防火墻廠家、出內部網絡的服務和訪問的審計和控制。一旦發(fā)現工作人員即將進入存在安全隱患的網站，防火墻就會立刻發(fā)出警報。龍巖防火墻廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="龍巖防火墻廠家,防火墻" src="https://tyunfile.71360.com/UploadFile/yuexin/637369762665859375/6835866.png"></div><p style="text-indent:25px">發(fā)展局限： 1.防火墻不能阻止來自內部網絡的攻擊。傳統(tǒng)防火墻設置安全策略的一個基本假設是: 網絡的一邊即外部的所有人是不可信任的,另一邊即網絡內部的所有人是可信任的。但實際上,80% 的攻擊訪問來自內部網絡,造成內部網絡不夠安全。另外傳統(tǒng)防火墻大多缺乏對主機意圖的了解,通常只能根據數據包的外在特性來進行過濾控制。 2.防火墻不能完全防止用戶傳送已得了病毒的軟件或文件。 3.為提高保護網絡的安全性, 防火墻限制或關閉了許多有用但存在安全漏洞的網絡服務。 4.防火墻是一種被動式防護手段, 它只能對已知網絡威脅起作用,不能防范新的網絡安全問題。 5.防火墻不能防范數據驅動型的攻擊。 6.內部網用戶通過特殊方式如網絡電話、聊天軟件等可以繞開防火墻與Internet 的直接連接;另外,一個高明的也可能利用新技術穿透防火墻。因此, 仍需要重視加強對主機安全的防護。 7.一旦系統(tǒng)管理員對防火墻配置不當,易遺留大量的安全漏洞。 8.防火墻的設置一般都基于IP 地址,因而內部網絡主機和服務器IP 地址的變化將導致設置文件中的規(guī)則改變,也就是說這些規(guī)則的設定受到網絡拓撲結構的制約。鷹潭防火墻效果怎么樣防火墻在內網中的設定位置是比較固定的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="龍巖防火墻廠家,防火墻" src="https://tyunfile.71360.com/UploadFile/yuexin/637369762378154297/6331845.png"></div><p style="text-indent:25px">用戶認證，DAS-Gateway-NGFW支持本地用戶認證、外部服務器用戶認證（RADIUS、LDAP、MS AD）、Web認證、802.1X。應用識別與控制，DAS-Gateway-NGFW提供普遍的應用層監(jiān)控、統(tǒng)計和控制過濾功能。該功能能夠對FTP、HTTP、P2P應用、實時通信工具以及VoIP語音數據等應用進行識別，并根據安全策略配置規(guī)則，保證應用的正常通信或對其進行指定的操作，如監(jiān)控、流量統(tǒng)計、流量控制和阻斷。DAS-Gateway-NGFW利用分片重組及傳輸層代理技術，使設備能夠適應復雜的網絡環(huán)境，即使在完整的應用層數據被分片傳送且分片出現失序、亂序的情況下，也能有效的獲取應用層信息，從而保證安全策略的有效實施。</p><p style="text-indent:25px">DAS-Gateway-NGFW網絡行為控制功能主要包括以下幾個方面：URL過濾，網頁關鍵字過濾，Web外發(fā)信息控制，郵件過濾，網絡聊天控制，應用行為控制，日志管理。URL過濾功能可以控制用戶對某些網站的訪問，并能對訪問行為進行日志記錄。通過配置分時段控制用戶對某類網站的訪問。比如，阻止用戶在上班時間訪問在線聊天類網站，下班后則允許訪問。控制用戶對網址中含有特定關鍵字的網站的訪問。比如，阻止用戶訪問網址中含有關鍵字“游戲”的網站。DAS-Gateway-NGFW可以對用戶訪問含有特定關鍵字內容的網站的行為進行控制，并能對訪問行為及所訪問網站的內容進行日志記錄。比如，阻止用戶訪問含“”詞匯的網站，并記錄訪問日志。通過應用防火墻技術能夠有效降低工作人員的實際操作風險。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="龍巖防火墻廠家,防火墻" src="https://tyunfile.71360.com/UploadFile/yuexin/637369762253925782/5436993.png"></div><p style="text-indent:25px">防火墻可以限制非法用戶，比如防止***、網絡破壞者等進入內部網絡，禁止存在安全脆弱性的服務和未授權的通信進出網絡，并抗擊來自各種路線的攻擊。對網絡存取和訪問進行記錄、監(jiān)控作為單一的網絡接入點，所有進出信息都必須通過防火墻，所以防火墻非常適用收集關于系統(tǒng)和網絡使用和誤用的信息并做出日志記錄。在防火墻上可以很方便地監(jiān)視網絡的安全性，并產生報警。防火墻通過用戶身份認證來確定合法用戶。防火墻通過事先確定的完全檢查策略，來決定內部用戶可以使用哪些服務，可以訪問哪些網站。監(jiān)測型防火墻能夠有效地判斷出各層中的非法侵入。龍巖防火墻廠家</p><p style="text-indent:25px">防火墻具有自學習功能，可以防范來自網絡的較新型攻擊。龍巖防火墻廠家</p><p style="text-indent:25px"> 隨著軟硬件處理能力、網絡帶寬的不斷提升，防火墻的數據處理能力也在得到提升。尤其近幾年多媒體流技術（在線視頻）的發(fā)展，要求防火墻的處理時延必須越來越小?；谝陨蠘I(yè)務需求，防火墻制造商開發(fā)了基于網絡處理器和基于ASIC(ApplicationSpecificIntegratedCircuits,專門用集成電路)的防火墻產品。基于網絡處理器的防火墻本質上還是依賴于軟件系統(tǒng)的解決方案，因此軟件性能的好壞直接影響防火墻的性能。而基于ASIC的防火墻產品具有定制化、可編程的硬件芯片以及與之相匹配的軟件系統(tǒng)，因此性能的優(yōu)越性不言而喻，可以很好地滿足客戶對系統(tǒng)靈活性和高性能的要求。龍巖防火墻廠家</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3165194.html</p></div></div></div></div></div><div id="e7mo2a3" class="page-right twoColRt"><div id="gh8m7dx" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="rrqhzqx" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應</p></a></div><div id="3k2aj2e" class="recomPic likePro"><a 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