?? vlan11.htm
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<div class=Section1 style='layout-grid:15.6pt'>
<p class=MsoNormal align=center style='text-align:center'><b style='mso-bidi-font-weight:
normal'><span style='font-size:14.0pt;font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>傳統型路由器存在的意義</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:14.0pt'><o:p></o:p></span></b></p>
<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
style='font-size:12.0pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:red'>路由器的必要性</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:12.0pt;
color:red'><o:p></o:p></span></b></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>三層交換機的價格，在問世之<span class=GramE>初非常</span>昂貴，但是現在<span
style='color:blue'>它們的價格已經下降了許多</span>。目前國外一些廉價機型的售價，折合成人民幣后僅為一萬多元，而且還在繼續下降中。</span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:red'>既然三層交換機能夠提供比傳統型路由器更為高速的路由處理，那么網絡中還有使用路由器的必要嗎</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>？</span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>答案是：“<span style='color:blue'>是</span>”。</span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>使用路由器的必要性，主要表現在以下幾個方面：</span></p>
<p class=MsoNormal align=left style='margin-left:21.0pt;text-align:left;
text-indent:-21.0pt;mso-pagination:widow-orphan;mso-list:l3 level1 lfo11;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='font-family:
Wingdings;mso-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;
color:blue'><span style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>用于與</span><span
lang=EN-US style='color:blue'>WAN</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>連接</span><span
lang=EN-US style='color:blue'><o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>三層交換機終究是“交換機”。也就是說，絕大多數機型<span style='color:red'>只配有</span></span><span
lang=EN-US style='color:red'>LAN</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:red'>（以太網）接口</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。在少數高端交換機上也有用于連接</span><span lang=EN-US>WAN</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>的串行接口或是</span><span lang=EN-US>ATM</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>接口，但在大多數情況下，連接</span><span lang=EN-US>WAN</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>還是需要用到路由器。</span></p>
<p class=MsoNormal align=left style='margin-left:21.0pt;text-align:left;
text-indent:-21.0pt;mso-pagination:widow-orphan;mso-list:l3 level1 lfo11;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='font-family:
Wingdings;mso-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;
color:blue'><span style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>保證網絡安全</span><span
lang=EN-US style='color:blue'><o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>在三層交換機上，通過數據包過濾也能確保一定程度的網絡安全。但是使用路由器所提供的各種網絡安全功能，用戶可以構建更為安全可靠的網絡。</span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>路由器提供的網絡安全功能中，除了最基本的數據包過濾功能外，還能基于</span><span class=SpellE><span
lang=EN-US>IPSec</span></span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>構建</span><span
lang=EN-US>VPN</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>（</span><span lang=EN-US>Virtual
Private Network</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>）、利用</span><span lang=EN-US>RADIUS</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>進行用戶認證等等。</span></p>
<p class=MsoNormal align=left style='margin-left:21.0pt;text-align:left;
text-indent:-21.0pt;mso-pagination:widow-orphan;mso-list:l3 level1 lfo11;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='font-family:
Wingdings;mso-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;
color:blue'><span style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>支持除</span><span
lang=EN-US style='color:blue'>TCP/IP</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>以外的網絡架構</span><span lang=EN-US style='color:blue'><o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>盡管</span><span lang=EN-US>TCP/IP</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>已經成為當前網絡協議架構的主流，但還有不少網絡利用</span><span lang=EN-US>Novell
Netware</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>下的</span><span lang=EN-US>IPX/SPX</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>或</span><span lang=EN-US>Macintosh</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>下的</span><span class=SpellE><span lang=EN-US>Appletalk</span></span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>等網絡協議。三層交換機中，除了部分高端機型外基本上還只支持</span><span lang=EN-US>TCP/IP</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。因此，<span style='color:blue'>在需要使用除</span></span><span
lang=EN-US style='color:blue'>TCP/IP</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>之外其他網絡協議的環境下，路由器還是必不可少的</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。</span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='font-size:9.0pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:red'>注：在少數高端交換機上，也能支持上述路由器的功能。例如</span><span
lang=EN-US style='font-size:9.0pt;color:red'>Cisco</span><span
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