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    <title>防火牆 and Proxy 部屬模式</title>
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    <description><![CDATA[<h2 id="防火牆定義">防火牆定義</h2>
<p>過濾封包的安全裝置，根據不同的防禦可以分成</p>
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<li>L3/L4 網路層防火牆，在 TCP/IP 運作，分為
<ol>
<li>Stateless 防火牆，沒有狀態，僅僅是根據</li>
<li>Stateful 防火牆，根據自己的狀態表來做防禦</li>
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<li>L7 應用層防火牆，對 L7 協議做防禦</li>
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<h3 id="防火牆架設">防火牆架設</h3>
<p>下面不同架設方式適用上面三種不同類型的防火牆。</p>]]></description>
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