{"id":477805,"date":"2023-08-09T09:20:41","date_gmt":"2023-08-09T09:20:41","guid":{"rendered":""},"modified":"2023-09-05T11:15:27","modified_gmt":"2023-09-05T11:15:27","slug":"layer-4-switch","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/tr\/wiki\/layer-4-switch\/","title":{"rendered":"Katman 4 anahtar\u0131"},"content":{"rendered":"

Katman 4 anahtar\u0131, OSI (A\u00e7\u0131k Sistemler Ba\u011flant\u0131s\u0131) modelinin Aktar\u0131m Katman\u0131nda (Katman 4) \u00e7al\u0131\u015fan bir a\u011f cihaz\u0131d\u0131r. Veri paketlerini ta\u015f\u0131ma katman\u0131 bilgilerine dayal\u0131 olarak, \u00f6ncelikle kaynak ve hedef ba\u011flant\u0131 noktas\u0131 numaralar\u0131n\u0131 kullanarak ileterek a\u011f trafi\u011finin y\u00f6netilmesinde \u00e7ok \u00f6nemli bir rol oynar. Katman 4 anahtarlar\u0131, proxy sunucular\u0131n ve di\u011fer a\u011f uygulamalar\u0131n\u0131n performans\u0131n\u0131 ve verimlili\u011fini optimize etmek i\u00e7in yayg\u0131n olarak kullan\u0131l\u0131r.<\/p>\n

Katman 4 anahtar\u0131n\u0131n k\u00f6keninin tarihi ve bundan ilk s\u00f6z<\/h2>\n

Katman 4 anahtarlama kavram\u0131, a\u011f m\u00fchendislerinin artan internet trafi\u011fini y\u00f6netmek i\u00e7in daha verimli yollar arad\u0131\u011f\u0131 1990'lar\u0131n sonlar\u0131nda ortaya \u00e7\u0131kt\u0131. Birincil hedef, geleneksel y\u00f6nlendiricilerin \u00fczerindeki y\u00fck\u00fc hafifletmek ve birden fazla istemci ba\u011flant\u0131s\u0131n\u0131 y\u00f6neten sunucular i\u00e7in daha iyi y\u00fck dengeleme \u00f6zellikleri sa\u011flamakt\u0131. Katman 4 ge\u00e7i\u015finin ilk s\u00f6z\u00fc, bu t\u00fcr cihazlar\u0131n potansiyel faydalar\u0131n\u0131n ara\u015ft\u0131r\u0131ld\u0131\u011f\u0131 2000'li y\u0131llar\u0131n ba\u015f\u0131ndaki ara\u015ft\u0131rma makalelerine ve teknik tart\u0131\u015fmalara kadar uzanabilir.<\/p>\n

Katman 4 anahtar\u0131 hakk\u0131nda ayr\u0131nt\u0131l\u0131 bilgi<\/h2>\n

Katman 4 anahtarlar\u0131, TCP (\u0130letim Kontrol Protokol\u00fc) ve UDP (Kullan\u0131c\u0131 Datagram Protokol\u00fc) trafi\u011fini i\u00e7eren OSI modelinin ta\u015f\u0131ma katman\u0131ndaki veri ak\u0131\u015flar\u0131n\u0131 y\u00f6netmek i\u00e7in olu\u015fturulmu\u015ftur. Alt katmanlarda \u00e7al\u0131\u015fan ve s\u0131ras\u0131yla MAC adreslerine ve IP adreslerine odaklanan Katman 2 anahtarlar\u0131n\u0131n (Ethernet anahtarlar\u0131) ve Katman 3 anahtarlar\u0131n\u0131n (IP y\u00f6nlendiricileri) aksine, Katman 4 anahtarlar\u0131, y\u00f6nlendirme kararlar\u0131 vermek i\u00e7in uygulama katman\u0131 verilerini ara\u015ft\u0131r\u0131r.<\/p>\n

Katman 4 anahtar\u0131n\u0131n i\u00e7 yap\u0131s\u0131: Katman 4 anahtar\u0131 nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/h2>\n

Katman 4 anahtar\u0131, kaynak ve hedef port numaralar\u0131n\u0131 belirlemek i\u00e7in gelen paketlerin ba\u015fl\u0131k bilgilerini inceleyerek \u00e7al\u0131\u015f\u0131r. Bu bilgiye dayanarak anahtar, paketleri uygun hedefe iletmek i\u00e7in ak\u0131ll\u0131 y\u00f6nlendirme kararlar\u0131 verebilir. Bu s\u00fcre\u00e7, trafi\u011fin birden fazla sunucu veya proxy d\u00fc\u011f\u00fcm\u00fc aras\u0131nda e\u015fit \u015fekilde da\u011f\u0131t\u0131lmas\u0131n\u0131 sa\u011flayarak yan\u0131t s\u00fcrelerini ve kaynak kullan\u0131m\u0131n\u0131 optimize etti\u011finden, verimli y\u00fck dengeleme i\u00e7in \u00e7ok \u00f6nemlidir.<\/p>\n

Katman 4 anahtar\u0131n\u0131n temel \u00f6zelliklerinin analizi<\/h2>\n

Katman 4 anahtarlar\u0131n\u0131n temel \u00f6zellikleri \u015funlard\u0131r:<\/p>\n

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  1. \n

    Y\u00fck dengeleme<\/strong>: Katman 4 anahtarlar\u0131n\u0131n temel i\u015flevlerinden biri, gelen trafi\u011fi birden fazla sunucuya veya arka u\u00e7 kayna\u011f\u0131na e\u015fit \u015fekilde da\u011f\u0131tmakt\u0131r. Bu dengeleme, sunucunun a\u015f\u0131r\u0131 y\u00fcklenmesini \u00f6nlemeye yard\u0131mc\u0131 olur ve y\u00fcksek kullan\u0131labilirlik ve iyile\u015ftirilmi\u015f yan\u0131t s\u00fcreleri sa\u011flar.<\/p>\n<\/li>\n

  2. \n

    Oturum Kal\u0131c\u0131l\u0131\u011f\u0131<\/strong>: Katman 4 anahtarlar\u0131, IP benze\u015fimi veya \u00e7erez tabanl\u0131 kal\u0131c\u0131l\u0131k gibi teknikleri kullanarak oturum kal\u0131c\u0131l\u0131\u011f\u0131n\u0131 koruyabilir. Bu, belirli bir istemciden gelen t\u00fcm isteklerin ayn\u0131 sunucuya y\u00f6nlendirilmesini sa\u011flayarak kullan\u0131c\u0131 oturumunun b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc korur.<\/p>\n<\/li>\n

  3. \n

    Sa\u011fl\u0131k Takibi<\/strong>: Katman 4 anahtarlar\u0131, arka u\u00e7 sunucularda sa\u011fl\u0131k kontrolleri ger\u00e7ekle\u015ftirerek yaln\u0131zca sa\u011fl\u0131kl\u0131 sunucular\u0131n trafik almas\u0131n\u0131 sa\u011flar. Bir sunucu yan\u0131t vermezse, anahtar trafi\u011fi otomatik olarak sa\u011fl\u0131kl\u0131 bir sunucuya y\u00f6nlendirerek genel sistem g\u00fcvenilirli\u011fini art\u0131r\u0131r.<\/p>\n<\/li>\n

  4. \n

    G\u00fcvenlik<\/strong>: Katman 4 anahtarlar\u0131, ba\u011flant\u0131 noktas\u0131 numaralar\u0131na g\u00f6re trafi\u011fi engelleyerek veya filtreleyerek temel bir g\u00fcvenlik duvar\u0131 g\u00f6revi g\u00f6rebilir. \u00d6zel g\u00fcvenlik duvarlar\u0131 kadar karma\u015f\u0131k olmasalar da a\u011fa ekstra bir g\u00fcvenlik katman\u0131 eklerler.<\/p>\n<\/li>\n<\/ol>\n

    Katman 4 anahtar t\u00fcrleri<\/h2>\n

    Katman 4 anahtarlar\u0131n\u0131n iki ana t\u00fcr\u00fc vard\u0131r: donan\u0131m tabanl\u0131 ve yaz\u0131l\u0131m tabanl\u0131. \u0130\u015fte ikisi aras\u0131nda bir kar\u015f\u0131la\u015ft\u0131rma:<\/p>\n\n\n\n\n\n\n\n\n\n\n
    Tip<\/strong><\/th>\nAvantajlar\u0131<\/strong><\/th>\nDezavantajlar\u0131<\/strong><\/th>\n<\/tr>\n<\/thead>\n
    Donan\u0131m tabanl\u0131<\/td>\n\u2013 Y\u00fcksek performans ve \u00f6l\u00e7eklenebilirlik<\/td>\n\u2013 Pahal\u0131 ve daha az esnek<\/td>\n<\/tr>\n
    <\/td>\n\u2013 Yo\u011fun trafik y\u00fckleri i\u00e7in optimize edilmi\u015ftir<\/td>\n\u2013 S\u0131n\u0131rl\u0131 \u00f6zelle\u015ftirme se\u00e7enekleri<\/td>\n<\/tr>\n
    <\/td>\n\u2013 Yerle\u015fik \u00f6zel donan\u0131m<\/td>\n<\/td>\n<\/tr>\n
    Yaz\u0131l\u0131m tabanl\u0131<\/td>\n\u2013 Uygun maliyetli ve esnek<\/td>\n\u2013 Y\u00fcksek y\u00fckler i\u00e7in s\u0131n\u0131rl\u0131 performans<\/td>\n<\/tr>\n
    <\/td>\n\u2013 Da\u011f\u0131t\u0131m\u0131 ve yap\u0131land\u0131rmas\u0131 kolay<\/td>\n\u2013 Daha y\u00fcksek CPU kaynaklar\u0131 gerektirir<\/td>\n<\/tr>\n
    <\/td>\n\u2013 D\u00fczenli yaz\u0131l\u0131m g\u00fcncellemeleri ve \u00f6zellikleri<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Layer 4 switch kullan\u0131m yollar\u0131, kullan\u0131ma ba\u011fl\u0131 sorunlar ve \u00e7\u00f6z\u00fcmleri<\/h2>\n

    Katman 4 anahtarlar\u0131 genellikle a\u015fa\u011f\u0131daki senaryolarda kullan\u0131l\u0131r:<\/p>\n

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    1. \n

      Proxy Sunucu Y\u00fck Dengeleme<\/strong>: Katman 4 anahtarlar\u0131, istemci isteklerini birden fazla proxy sunucusu aras\u0131nda da\u011f\u0131tmak i\u00e7in yayg\u0131n olarak kullan\u0131l\u0131r ve daha iyi performans ve yedeklilik sa\u011flar.<\/p>\n<\/li>\n

    2. \n

      Uygulama Y\u00fck Dengeleme<\/strong>: Birden fazla uygulama sunucusu aras\u0131ndaki trafi\u011fi dengelemek ve genel uygulama yan\u0131t verme h\u0131z\u0131n\u0131 art\u0131rmak i\u00e7in kullan\u0131l\u0131rlar.<\/p>\n<\/li>\n

    3. \n

      Sunucu Grubu Y\u00fck Dengeleme<\/strong>: Veri merkezlerinde, Katman 4 anahtarlar\u0131 trafi\u011fi bir sunucu grubu aras\u0131nda e\u015fit \u015fekilde da\u011f\u0131tarak sunucunun a\u015f\u0131r\u0131 y\u00fcklenmesi riskini azalt\u0131r.<\/p>\n<\/li>\n

    4. \n

      Global Sunucu Y\u00fck Dengeleme<\/strong>: Co\u011frafi olarak da\u011f\u0131t\u0131lm\u0131\u015f sunucu altyap\u0131lar\u0131 i\u00e7in, Katman 4 anahtarlar\u0131 trafi\u011fi en yak\u0131n sunucuya y\u00f6nlendirerek d\u00fcnya \u00e7ap\u0131ndaki kullan\u0131c\u0131lar i\u00e7in yan\u0131t s\u00fcrelerini optimize edebilir.<\/p>\n<\/li>\n<\/ol>\n

      Zorluklar ve \u00e7\u00f6z\u00fcmler:<\/p>\n