{"id":9841,"date":"2026-11-03T11:19:50","date_gmt":"2026-11-03T08:19:50","guid":{"rendered":"https:\/\/www.turkticaret.net\/blog\/?p=9841"},"modified":"2026-11-03T11:21:04","modified_gmt":"2026-11-03T08:21:04","slug":"sdn-nedir-yazilim-tanimli-aglarin-calisma-mantigi","status":"publish","type":"post","link":"https:\/\/www.turkticaret.net\/blog\/sdn-nedir-yazilim-tanimli-aglarin-calisma-mantigi\/","title":{"rendered":"SDN Nedir? Yaz\u0131l\u0131m Tan\u0131ml\u0131 A\u011flar\u0131n \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131"},"content":{"rendered":"

SDN, a\u011f\u0131n kontrol i\u015flevlerini veri iletiminden ay\u0131rarak a\u011f davran\u0131\u015f\u0131n\u0131n yaz\u0131l\u0131mla y\u00f6netilmesini sa\u011flayan bir mimaridir. A\u00e7\u0131l\u0131m\u0131 Software Defined Networking olan bu yakla\u015f\u0131m, T\u00fcrk\u00e7ede yaz\u0131l\u0131m tan\u0131ml\u0131 a\u011f olarak adland\u0131r\u0131l\u0131r. A\u011f kurallar\u0131, merkezi bir kontrol yap\u0131s\u0131 \u00fczerinden programlanabilir ve ilgili cihazlara uygulanabilir.<\/span><\/p>\n

\"SDN<\/p>\n

Geleneksel A\u011flardan Ayr\u0131lan Kontrol Yap\u0131s\u0131<\/b><\/h2>\n

Yaz\u0131l\u0131m tan\u0131ml\u0131 a\u011f yakla\u015f\u0131m\u0131n\u0131 geleneksel a\u011flardan ay\u0131ran temel \u00f6zellik, trafi\u011fi y\u00f6neten kararlar\u0131n nas\u0131l olu\u015fturuldu\u011fudur. Geleneksel yap\u0131larda cihazlar\u0131n \u00fczerinde \u00e7al\u0131\u015fan kontrol i\u015flevleri, SDN mimarisinde a\u011f genelini y\u00f6netebilen yaz\u0131l\u0131msal bir kontrol katman\u0131yla koordine edilir.<\/span><\/p>\n

Bu ayr\u0131m\u0131 anlamak i\u00e7in kontrol d\u00fczlemi ve veri d\u00fczlemi kavramlar\u0131 kullan\u0131l\u0131r. Kontrol d\u00fczlemi, trafi\u011fin hangi kurallarla ve hangi yollar \u00fczerinden ilerleyece\u011fini belirler. Veri d\u00fczlemi ise paketleri bu kurallara g\u00f6re iletir. SDN, bu iki i\u015flevi birbirinden ay\u0131rarak kontrol\u00fcn programlanabilmesini sa\u011flar.<\/span><\/p>\n

Yaz\u0131l\u0131m tan\u0131ml\u0131 yap\u0131da<\/span> router<\/span><\/a> gibi y\u00f6nlendirme cihazlar\u0131n\u0131n veya sanal a\u011f bile\u015fenlerinin davran\u0131\u015flar\u0131, \u00e7\u00f6z\u00fcm\u00fcn destekledi\u011fi \u00f6l\u00e7\u00fcde denetleyici \u00fczerinden y\u00f6netilebilir. Fiziksel cihazlar ortadan kalkmaz; kontrol ve y\u00f6netim sorumluluklar\u0131n\u0131n da\u011f\u0131l\u0131m\u0131 de\u011fi\u015fir.<\/span><\/p>\n

SDN k\u0131saltmas\u0131n\u0131n farkl\u0131 alanlarda ba\u015fka anlamlar\u0131 da vard\u0131r. \u201cSDN listesi nedir\u201d aramas\u0131yla kar\u015f\u0131la\u015f\u0131lan OFAC listesi, yapt\u0131r\u0131mlarla ili\u015fkili ki\u015fi ve kurulu\u015f kay\u0131tlar\u0131n\u0131 ifade eder. Bu kullan\u0131m, a\u011f teknolojisi olan Software Defined Networking ile ilgili de\u011fildir; iki kavram yaln\u0131zca ayn\u0131 k\u0131saltmay\u0131 payla\u015f\u0131r.<\/span><\/p>\n

SDN Mimarisi ve Katmanlar\u0131n G\u00f6revleri<\/b><\/h2>\n

SDN mimarisi, uygulamalar\u0131n a\u011fdan bekledi\u011fi davran\u0131\u015flar\u0131 iletim kurallar\u0131na d\u00f6n\u00fc\u015ft\u00fcren katmanlardan olu\u015fur. Yayg\u0131n a\u00e7\u0131klama modeli; uygulama, kontrol ve altyap\u0131 katmanlar\u0131n\u0131 birbirinden ay\u0131r\u0131r. Her katman farkl\u0131 bir g\u00f6rev \u00fcstlenir ve tan\u0131mlanm\u0131\u015f aray\u00fczlerle di\u011fer katmanlarla ileti\u015fim kurar.<\/span><\/p>\n

Bu yap\u0131daki temel g\u00f6revler \u015f\u00f6yle \u00f6zetlenebilir:<\/span><\/p>\n