?? vlan10.htm
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<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"'>加速</span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:14.0pt'>VLAN</span></b><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"'>間通信的手段</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'>流<span class=GramE>（</span></span></b><b
style='mso-bidi-font-weight:normal'><span lang=EN-US style='font-size:12.0pt;
color:red'>Flow</span></b><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'>）</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"'>根據(jù)到此為止的學(xué)習(xí)，我們已經(jīng)知道</span><span lang=EN-US style='color:blue'>VLAN</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>間路由，必須經(jīng)過(guò)外部的路由器或是三層交換機(jī)的內(nèi)置路由模塊</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。但是，有時(shí)并不是所有的數(shù)據(jù)都需要經(jīng)過(guò)路由器（或路由模塊）。</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"'>例如，使用</span><span lang=EN-US>FTP</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>File Transfer Protocol</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>）傳輸容量為數(shù)</span><span lang=EN-US>MB</span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>以上的較大的文件時(shí)，<span style='color:red'>由于</span></span><span
lang=EN-US style='color:red'>MTU</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:red'>的限制，</span><span
lang=EN-US style='color:red'>IP</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:red'>協(xié)議會(huì)將數(shù)據(jù)分割成小塊后傳輸、并在接收<span
class=GramE>方重新</span>組合</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。這些被分割的數(shù)據(jù)，“發(fā)送的目標(biāo)”是完全相同的。發(fā)送目標(biāo)相同，也就意味著同樣的目標(biāo)</span><span
lang=EN-US>IP</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>地址、目標(biāo)端口號(hào)（注：特別強(qiáng)調(diào)一下，這里指的是</span><span
lang=EN-US>TCP/UDP</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>端口）。自然，源</span><span
lang=EN-US>IP</span><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>地址、源端口號(hào)也應(yīng)該相同。<span style='color:blue'>這樣一連串的數(shù)據(jù)流被稱為“流（</span></span><span
lang=EN-US style='color:blue'>Flow</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>）”</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
class=GramE><span style='font-family:宋體;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman";color:blue'>只要將流最初</span></span><span
style='font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman";color:blue'>的數(shù)據(jù)正確地路由以后，后繼的數(shù)據(jù)理應(yīng)也會(huì)被同樣地路由</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"'>據(jù)此，<span style='color:blue'>后繼的數(shù)據(jù)不再需要路由器進(jìn)行路由處理；通過(guò)省略反復(fù)進(jìn)行的路由操作，可以進(jìn)一步提高</span></span><span
lang=EN-US style='color:blue'>VLAN</span><span style='font-family:宋體;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";
color:blue'>間路由的速度</span><span style='font-family:宋體;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。</span></p>
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