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id="contentText"> <p> 之前有說過拓?fù)涑Ｒ婎愋?，今天我們便來講講星型拓?fù)?，它是局域網(wǎng)中最常用的一種拓?fù)浣Y(jié)構(gòu)，主要星型拓?fù)浣Y(jié)構(gòu)簡(jiǎn)單，網(wǎng)絡(luò)延遲時(shí)間較小，傳輸誤差低擴(kuò)展性比較強(qiáng)，當(dāng)然，它也存在一些缺點(diǎn)，接下來讓我們來了解下吧</p><p> 星型拓?fù)?/p><p><span style="font-stretch: normal;"></span>星形拓?fù)涫怯芍醒牍?jié)點(diǎn)和通過點(diǎn)到點(diǎn)通信鏈路接到中央節(jié)點(diǎn)的各個(gè)站點(diǎn)組成。中央節(jié)點(diǎn)執(zhí)行集中式通信控制策略,因此中央節(jié)點(diǎn)相當(dāng)復(fù)雜,而各個(gè)站點(diǎn)的通信處理負(fù)擔(dān)都很小。星形網(wǎng)采用的交換方式有電路交換和報(bào)文交換,尤以電路交換更為普遍。這種結(jié)構(gòu)一旦建立了通道連接,就可以無延遲地在連通的兩個(gè)站點(diǎn)之間傳送數(shù)據(jù)。目前流行的專用交換機(jī)PBX (Private Branch exchange)就是星形拓?fù)浣Y(jié)構(gòu)的典型實(shí)例。</p><p> 星型拓?fù)浣Y(jié)構(gòu)的優(yōu)點(diǎn)</p><p><span style="font-stretch: normal;"></span>(1)結(jié)構(gòu)簡(jiǎn)單，連接方便，管理和維護(hù)都相對(duì)容易，而且擴(kuò)展性強(qiáng)。</p><p><span style="font-stretch: normal;"></span>(2)網(wǎng)絡(luò)延遲時(shí)間較小，傳輸誤差低。</p><p><span style="font-stretch: normal;"></span>(3)在同一網(wǎng)段內(nèi)支持多種傳輸介質(zhì)，除非中心結(jié)點(diǎn)故障，否則網(wǎng)絡(luò)不會(huì)輕易癱瘓。因此，星型網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)是目前應(yīng)用最廣泛的一種網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)。</p><p> 星型拓?fù)浣Y(jié)構(gòu)的缺點(diǎn)</p><p><span style="font-stretch: normal;"></span>(1)安裝和維護(hù)的費(fèi)用較高</p><p><span style="font-stretch: normal;"></span>(2)共享資源的能力較差</p><p><span style="font-stretch: normal;"></span>(3)通信線路利用率不高(4)對(duì)中心結(jié)點(diǎn)要求相當(dāng)高，一旦中心結(jié)點(diǎn)出現(xiàn)故障，則整個(gè)網(wǎng)絡(luò)將癱瘓。</p><p> 星形拓?fù)浣Y(jié)構(gòu)廣泛應(yīng)用于網(wǎng)絡(luò)的智能集中于中央節(jié)點(diǎn)的場(chǎng)合。從目前的趨勢(shì)看,計(jì)算機(jī)的發(fā)展已從集中的主機(jī)系統(tǒng)發(fā)展到大量功能很強(qiáng)的微型機(jī)和工作站,在這種形勢(shì)下,傳統(tǒng)的星形拓?fù)涞氖褂脮?huì)有所減少。</p> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("conten");</script></div> <div id="tmyyfroktkho" class="pnum"> <ul id="page_slice"> <div id="tmyyfroktkho" class="clear"></div> </ul> </div> <a 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