paketga yopishtirish. Transport qatlami protokollari: ATP (AppleTalk Transaction Protocol), CUDP (Cyclic UDP), DCCP (Datagram tıkanıklığı nazorat qilish protokoli), FCP (Fiber Channel Protocol), IL (IL Protocol), NBF (NetBIOS Framesocol), NCP (NetWare Core Protocol) ), SCTP (Stream Control Transmission Protocol), SPX (Sequenced Packet Exchange), SST (Structured Stream Transport), TCP (Transmission Control Protocol), UDP (User Datagram Protocol). Modelning tarmoq pog’onasi ma'lumotlarni uzatish yo'lini aniqlash uchun muammolarni kuzatish va tarmoqdagi "tirbandlik" uchun javobgardir. Tarmoq pog’onasi protokollari ma'lumotlarni manbadan manzilga yo'naltiradi. Ushbu darajada ishlaydigan qurilmalar (routerlar) an'anaviy ravishda uchinchi darajali qurilmalar deb nomlanadi (OSI modelidagi daraja
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