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01:12:35</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="ic7nuye" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海雪萊信息科技有限公司</a></p><p><span>聯(lián)系人：</span>許經(jīng)理</p><p><span>郵箱: </span>846864328@qq.com</p><p><span>電話: </span>18621860861</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>021-68072100</p><p><span>地址: </span>南匯新城鎮(zhèn)環(huán)湖西二路800號(hào)215室</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="8wqklxj" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="qf2g733" class="box"><p><p style="text-indent:25px">深信服AD應(yīng)用交付設(shè)備集成智能路由、DNS透明代理和智能DNS解析等技術(shù)，通過輪詢，河北什么是負(fù)載均衡多少錢、加權(quán)輪詢、靜態(tài)就近性、動(dòng)態(tài)就近性等算法，解決多鏈路網(wǎng)絡(luò)環(huán)境中流量分擔(dān)的問題，充分提高多鏈路的帶寬利用率，節(jié)約企事業(yè)單位對(duì)通信鏈路的投資；并且通過為用戶分配比較好的通信線路，使用戶獲得較好的訪問體驗(yàn)。此外，深信服AD應(yīng)用交付設(shè)備還利用鏈路健康檢查及會(huì)話保持技術(shù)，河北什么是負(fù)載均衡多少錢，實(shí)現(xiàn)了在某條鏈路中斷的情況下任然可以提供訪問鏈接能力，充分利用了多條鏈路帶來的可靠性保障，使對(duì)于用戶的訪問達(dá)到了**多方位的支持，河北什么是負(fù)載均衡多少錢。能夠?yàn)橛脩舻膽?yīng)用發(fā)布提供包括多數(shù)據(jù)中心負(fù)載均衡、多鏈路負(fù)載均衡、服務(wù)器負(fù)載均衡的多方位解決方案。河北什么是負(fù)載均衡多少錢</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河北什么是負(fù)載均衡多少錢,負(fù)載均衡" src="http://tyunfile.71360.com/UploadFile/heixiang4/637167061606250000/394821.jpg"></div><p style="text-indent:25px">基于七層內(nèi)容的調(diào)度機(jī)制，使得管理員可以通過應(yīng)用層的內(nèi)容交換來分配服務(wù)器資源，以實(shí)現(xiàn)用戶請(qǐng)求調(diào)度的多元化和個(gè)性化，業(yè)務(wù)應(yīng)用的場(chǎng)景十分多方位。例如，基于URI、HOST、COOKIE、USER_AGENT等HTTP頭部?jī)?nèi)容的匹配策略來選擇服務(wù)器，或者通過對(duì)HTTP頭部進(jìn)行請(qǐng)求改寫和應(yīng)答改寫，執(zhí)行頁面跳轉(zhuǎn)和丟棄等操作，實(shí)現(xiàn)不同業(yè)務(wù)系統(tǒng)之間的交互聯(lián)動(dòng)。在L7服務(wù)器負(fù)載均衡的場(chǎng)景中，AD設(shè)備先與客戶端建立TCP連接，獲取到訪問請(qǐng)求的報(bào)文之后，再根據(jù)報(bào)文中所帶的應(yīng)用層內(nèi)容來選擇合適的服務(wù)器并與之建立TCP連接，此時(shí)AD設(shè)備所扮演的角色類似于一臺(tái)代理服務(wù)器。河北什么是負(fù)載均衡多少錢深信服實(shí)現(xiàn)一個(gè)域名綁定多個(gè)運(yùn)營商的公網(wǎng)地址。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河北什么是負(fù)載均衡多少錢,負(fù)載均衡" src="http://tyunfile.71360.com/UploadFile/heixiang4/637172002901464844/6884525.png"></div><p> 深信服AD系列應(yīng)用交付產(chǎn)品支持路由、旁路兩種部署模式，支持VLAN、STP等局域網(wǎng)協(xié)議，并可與動(dòng)態(tài)路由協(xié)議（例如OSPF、RIPv1、RIPv2）網(wǎng)絡(luò)進(jìn)行對(duì)接，以幫助用戶應(yīng)對(duì)各種復(fù)雜的網(wǎng)絡(luò)環(huán)境。在業(yè)務(wù)持久性、終端用戶訪問體驗(yàn)、數(shù)據(jù)中心可用性等多個(gè)應(yīng)用領(lǐng)域，均可通過部署AD設(shè)備予以優(yōu)化。 </p> <p> 在AD設(shè)備上啟動(dòng)SNMP服務(wù)后，用戶可使用SNMP客戶端軟件查詢到AD設(shè)備的CPU負(fù)載、內(nèi)存占用、新建連接、并發(fā)連接、吞吐量等各種信息，方便地監(jiān)控設(shè)備的硬件負(fù)載狀況。此外，AD設(shè)備也支持ACL功能，允許用戶根據(jù)連接的五元組對(duì)訪問進(jìn)行精確的控制。 </p><p> <br /> </p> <p> <br /> </p> <p> ? 快速恢復(fù)－快速檢測(cè)出丟包，并能快速準(zhǔn)確重傳該包，對(duì)時(shí)延較大，網(wǎng)絡(luò)狀況較差的情況能夠有效的提升帶寬利用率，通過更改快速恢復(fù)過程中發(fā)送端可以用來提高發(fā)送速率的方法，提供更大的吞吐量。 </p> <p> ? 慢啟動(dòng)－避免發(fā)送 TCP 對(duì)等方擁塞整個(gè)網(wǎng)絡(luò)的現(xiàn)有算法被稱為“慢啟動(dòng)”和“擁塞避免”。在連接**初發(fā)送數(shù)據(jù)和還原丟失段時(shí)，這些算法可以增大發(fā)送窗口，即發(fā)送端可以發(fā)送的段數(shù)量。對(duì)于每個(gè)接收到的確認(rèn)段或每個(gè)已經(jīng)確認(rèn)的段，“慢啟動(dòng)”算法會(huì)以一個(gè)完整的 TCP 段增大發(fā)送窗口。對(duì)于每個(gè)已經(jīng)確認(rèn)的完整窗口的數(shù)據(jù)，“擁塞避免”算法以一個(gè)完整的TCP 段增大發(fā)送窗口。利用這些算法增大發(fā)送窗口的速度就足以充分利用連接帶寬。深信服AD設(shè)備提供有一種稱為會(huì)話保持（Session Persistence）的機(jī)制。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河北什么是負(fù)載均衡多少錢,負(fù)載均衡" src="http://tyunfile.71360.com/UploadFile/heixiang4/637172002901630860/7755282.png"></div><p> <br /> </p> <p> <br /> </p> <p> 傳統(tǒng)TCP協(xié)議是基于局域網(wǎng)設(shè)計(jì)，一旦運(yùn)用到互聯(lián)網(wǎng)這種不穩(wěn)定環(huán)境中的時(shí)候，就會(huì)使得數(shù)據(jù)的傳輸效率降低，特別在延時(shí)比較大、有丟包的時(shí)候尤為明顯。單邊加速技術(shù)通過對(duì)擁塞算法做優(yōu)化處理，解決一些TCP協(xié)議本身的缺點(diǎn)，以實(shí)現(xiàn)加速的效果；其**部分是對(duì)擁塞算法做優(yōu)化，如慢啟動(dòng)，擁塞避免，快速重傳，快速恢復(fù)等。 </p> <p> ? 擁塞避免－能夠快速的準(zhǔn)確的預(yù)估出網(wǎng)絡(luò)中可用帶寬，并根據(jù)估計(jì)值確定擁塞避免窗口，從而比較大限度的利用網(wǎng)絡(luò)帶寬。 </p> <p> ? 快速重傳－允許接收端通過使用 SACK TCP 選項(xiàng)指示**多四個(gè)接收數(shù)據(jù)的非鄰接塊。RFC 2883 定義用于確認(rèn)重復(fù)的數(shù)據(jù)包的 SACK TCP 選項(xiàng)中的字段的額外使用。發(fā)送端可以通過此操作確定何時(shí)重傳了不必要的段并調(diào)整其行為，以防今后不必要的重傳。發(fā)送的重傳越少，整體吞吐量越合理。擁有多條同一運(yùn)營商的互聯(lián)網(wǎng)鏈路，各條鏈路的帶寬也相近。河北什么是負(fù)載均衡多少錢</p><p style="text-indent:25px">服務(wù)器負(fù)載均衡原先被創(chuàng)造出來用以解決網(wǎng)絡(luò)方面的問題。河北什么是負(fù)載均衡多少錢</p><p> 深信服AD設(shè)備基于內(nèi)存的反向代理Cache功能，在內(nèi)存中緩存網(wǎng)站等相關(guān)資源的頁面內(nèi)容；采用內(nèi)存緩存和包存儲(chǔ)結(jié)構(gòu)的方式，通過動(dòng)態(tài)調(diào)整緩存空間提供遠(yuǎn)比其它緩存產(chǎn)品更快速的響應(yīng)速度。 </p> <p> 深信服AD設(shè)備緩存功能可降低用戶訪問對(duì)后臺(tái)服務(wù)器的負(fù)載壓力，在減少了后臺(tái)服務(wù)器投資成本的同時(shí)，提高了系統(tǒng)的處理能力和用戶的訪問體驗(yàn)。 </p> <p> <br /> </p> <p> 深信服AD設(shè)備的HTTP壓縮功能，可通過標(biāo)準(zhǔn)的HTTP壓縮規(guī)范自動(dòng)識(shí)別客戶端對(duì)gzip或deflate壓縮算法的支持情況，并能夠?qū)崿F(xiàn)對(duì)數(shù)據(jù)動(dòng)態(tài)壓縮。 </p> <p> 深信服AD設(shè)備的壓縮功不僅能在很大程度上節(jié)省組織的互聯(lián)網(wǎng)帶寬，縮短用戶下載內(nèi)容的等待時(shí)間，更減輕了Web服務(wù)器的壓力，節(jié)省硬件投資成本，提升用戶的訪問體驗(yàn)。 </p> <p> <br /> 河北什么是負(fù)載均衡多少錢</p></p><br /><p>文章來源地址: 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