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                # **TCP和UDP介紹** **1、TCP面向連接(如打電話要先撥號建立連接);UDP是無連接的,即發送數據之前不需要建立連接** **2、TCP提供可靠的服務。也就是說,通過TCP連接傳送的數據,無差錯,不丟失,不重復,且按序到達;UDP盡最大努力交付,即不保證可靠交付** **3、tcp通過校驗和,重傳控制,序號標識,滑動窗口、確認應答實現可靠傳輸。如丟包時的重發控制,還可以對次序亂掉的分包進行順序控制。** **3、UDP具有較好的實時性,工作效率比TCP高,適用于對高速傳輸和實時性有較高的通信或廣播通信。** **4、TCP對系統資源要求較多,UDP對系統資源要求較少。** ![](https://i.vgy.me/V0eslI.png)
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