<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 lfo10;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='mso-bidi-font-size:
10.5pt;font-family:Wingdings;mso-fareast-font-family:Wingdings;mso-bidi-font-family:
Wingdings'><span style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style='mso-bidi-font-size:10.5pt;
font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>轉(zhuǎn)發(fā)端口號（交換機）</span><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></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 lfo10;
tab-stops:list 21.0pt'><![if !supportLists]><span lang=EN-US style='mso-bidi-font-size:
10.5pt;font-family:Wingdings;mso-fareast-font-family:Wingdings;mso-bidi-font-family:
Wingdings'><span style='mso-list:Ignore'>l<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style='mso-bidi-font-size:10.5pt;
font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>轉(zhuǎn)發(fā)目標</span><span lang=EN-US style='mso-bidi-font-size:10.5pt'>MAC</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>地址</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>等等。</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>同一個流的第二塊以后的數(shù)據(jù)到達交換機后，直接通過查詢先前保存在緩存中的信息查出“轉(zhuǎn)發(fā)端口號”后就可以轉(zhuǎn)發(fā)<span
class=GramE>給目標</span>所連端口了</span><span style='mso-bidi-font-size:10.5pt;
font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。</span><span lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>這樣一來，就不需要再一次次經(jīng)由內(nèi)部路由模塊中繼，而僅憑交換機內(nèi)部的緩存信息就足以判斷應該轉(zhuǎn)發(fā)的端口。</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

<p class=MsoNormal align=left style='text-align:left;mso-pagination:widow-orphan'><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>這時，交換機會對數(shù)據(jù)幀進行由路由器中繼時相似的處理，例如改寫</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>MAC</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>地址、</span><span lang=EN-US style='mso-bidi-font-size:10.5pt'>IP</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>包頭中的</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>TTL</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>和</span><span lang=EN-US style='mso-bidi-font-size:10.5pt'>Check
Sum</span><span style='mso-bidi-font-size:10.5pt;font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>校驗<span class=GramE>碼信息</span>等，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><o:p></o:p></span></p>

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     <p class=MsoNormal align=center style='text-align:center'><span
     lang=EN-US style='font-family:宋體'>②</span><span lang=EN-US><o:p></o:p></span></p>
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     <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
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     <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
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     <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
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     <p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
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     <p class=MsoNormal align=center style='text-align:center'><b
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     mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>客戶端</span><span
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     <p class=MsoNormal align=center style='text-align:center'><span
     lang=EN-US style='font-size:7.5pt'>IP:192.168.1.1/24<o:p></o:p></span></p>
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     lang=EN-US style='font-size:7.5pt'>MAC</span><span style='font-size:7.5pt;
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