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The transport layer manages packing and unpacking of data, the delivery of packets and checking for errors in the data once it arrives.
transport layer
Conversation Multiplexing Segmentation and Rassembly Error Checking
UDP
http needs a reliable mechanism to provide connectivity between the Host i.e. the web browser and the Server i.e the web server. Now TCP is the transport layer protocol that provides it reliable communication with three-way handshake mechanism it uses to connect between a client and a server. We also have UDP at transport layer but it is not reliable way of communicating. So http uses TCP at transport layer of OSI Model.
transport layer
TCP and UDP are transport layer protocols; the OSI layer is layer 4 (transport)
Application layer, and Transport layer.
Middle layer of osi model is Transport layer functions: 1.Segmentation of data 2.connection managment 3.flow control of data 4.Error checking
at the network layer, congestion control mechanism takes place
transport layer