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          今日推薦首頁  > 企業網站建設 > 建站知識 > 網站建設基本知識
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          什么是網站的服務器

           

          服務器定義  
          從理論定義來看,服務器是網絡環境中的高性能計算機,它偵聽網絡上其它計算機(客戶機)提交的服務請求,并提供相應的服務。為此,服務器必須具有承擔服務并且保障服務質量的能力。  
          但是這樣來解釋仍然顯得較為深奧模糊,其實服務器與個人電腦的功能相類似,均是幫助人類處理信息的工具,只是二者的定位不同,個人電腦(簡稱為Personal Computer,PC)是為滿足個人的多功能需要而設計的,而服務器是為滿足眾多用戶同時在其上處理數據而設計的。而多人如何同時使用同一臺服務器呢?這只能通過網絡互聯,來幫助達到這一共同使用的目的。  
          我們再來看服務器的功能,服務器可以用來搭建網頁服務(我們平常上網所看到的網頁頁面的數據就是存儲在服務器上供人訪問的)、郵件服務(我們發的所有電子郵件都需要經過服務器的處理、發送與接收)、文件共享&打印共享服務、數據庫服務等。而這所有的應用都有一個共同的特點,他們面向的都不是一個人,而是眾多的人,同時處理的是眾多的數據。所以服務器與網絡是密不可分的,可以說離開了網絡,就沒有服務器;服務器是為提供服務而生,只有在網絡環境下它才有存在的價值。而個人電腦完全可以在單機的情況下完成主人的數據處理任務。  

          什么是代理服務器?  
          常常會聽到別人說,你的瀏覽器要設代理服務器(Proxy Server),這樣你上網的速度會比較快。到底什么是代理服務器,它在Internet里扮演什么樣的角色?  
          當使用者要向服務器要求資料時,假設使用者輸入www.google.com向google索取資料時,在正常的網路流程中,當使用者的瀏覽器看到www.google.com這個域名(Domain Name)時,會向域名解析服務器(DNS)尋找www.google.com所對應的IP地址,當DNS傳回對應的IP地址后,瀏覽器會再對這個google服務器索取資料,這看起來是沒有問題的,但如果網絡阻塞、網站的機器配備不好、網站的專線不夠快等不良的因素通通加在一起后,你要連接的網站就會變的很慢,所以這個時候有一個叫代理服務器的東西,會把大家常常看的網頁資料暫存在一個位置,這個位置的機器設備通常會很好,線路帶寬會很大,所以用戶讀取的速度就會很快。   
          當用戶設了代理服務器時,瀏覽器在讀取資料時,資料應該是如何傳遞的呢?相同的,瀏覽器會先向DNS查詢IP地址,然后找到IP地址后,會先向代理服務器查詢是否有這個網站的資料,如果有的話,代理服務器就直接把內容傳給了用戶,如果代理服務器沒有資料的話,才會直接向網站要資料。  

          代理服務器功能  
          (1)設置用戶驗證和記帳功能,可按用戶進行記帳,沒有登記的用戶無權通過代理服務器訪問Internet網。并對用戶的訪問時間、訪問地點、信息流量進行統計。  
          (2)對用戶進行分級管理,設置不同用戶的訪問權限,對外界或內部的Internet地址進行過濾,設置不同的訪問權限。   
          (3)增加緩沖器(Cache),提高訪問速度,對經常訪問的地址創建緩沖區,大大提高熱門站點的訪問效率。通常代理服務器都設置一個較大的硬盤緩沖區(可能高達幾個GB或更大),當有外界的信息通過時,同時也將其保存到緩沖區中,當其他用戶再訪問相同的信息時,則直接由緩沖區中取出信息,傳給用戶,以提高訪問速度。  
          (4)連接Internet與Internet,充當防火墻(Firewall):因為所有內部網的用戶通過代理服務器訪問外界時,只映射為一個IP地址,所以外界不能直接訪問到內部網;同時可以設置IP地址過濾,限制內部網對外部的訪問權限。   
          (5)節省IP開銷:代理服務器允許使用大量的偽IP地址,節約網上資源,即用代理服務器可以減少對IP地址的需求,對于使用局域網方式接入Internet ,如果為局域網(LAN)內的每一個用戶都申請一個IP地址,其費用可想而知。但使用代理服務器后,只需代理服務器上有一個合法的IP地址,LAN內其他用戶可以使用10.*.*.*這樣的私有IP地址,這樣可以節約大量的IP,降低網絡的維護成本。  

          服務器托管   
            如果您已經擁有了自己的服務器,很快會發現維護工作是一件非常傷腦筋的事情:除了需要購置服務器硬件、軟件、還得租用昂貴的通訊線路,需要網絡環境、機房環境和技術人員的24小時值班,這些都需要占用企業相當的精力和資金。   
          現在,啟航信息提供的主機托管服務使這些問題迎刃而解。其頂級網絡環境和電信級專用機柜,雙路高壓電信供電、智能UPS、充足功率的柴油發電機保障和24小時值班工程師,在為您提供全面的托管服務及充足的帶寬保證的同時,還可以為您節省大量的人力和物力。我們將依托豐富的資源和雄厚的技術力量,為您提供高效專業的服務,使您能夠利用自身有限的條件開發無限的網絡空間。

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