Transport Layer Protocols
Need of Transport Layer a. The Internet layer provides unreliable , connectionless service - "best effort" network. b. The underlying layer (internal layer ) provides the connectionless protocol IP . c. Datagrams may be lost or reordered . d. Datagrams can be duplicated or delivered after long delays . Thus , there is a need for a layer , which takes care of end - to - end delivery. Features of transport layer i. True end to end layer . ii . Takes care of process to process delivery. iii . Acts as a liaison between the application layer and the underlying internetwork details . iv . Shields the applications from the complexities of the internetwork. v. Provides a "logical communication " between application processes running on different hosts . For this purpose ,it performs the following duties: i. Packetizing : Divides the application data into packets to be sent over the internetwork . ii . Connection Control : Controls the "logical " c...