The four main functions of the Transport layer are:
Segment and assemble upper-layer applications
Transport segments from one host to another host
Establish and manage end-to-end operations
Error recovery
In carrying out its duties, the Transport layer performs a range of support activities, including:
Maintaining data integrity through flow control techniques
Multiplexing the data from upper layer applications
Setting up and tearing down any virtual circuits established to transport the data over the network
Hiding any network-dependent information from the upper layers (which will only confuse them)
Breaking down Session layer (layer 5) datagrams into segments
Monitoring the error-free delivery of the data to its destination
Providing for general connection management and data transfer services
Providing for the reliable (but, not guaranteed) delivery of data
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In carrying out its duties, the Transport layer performs a range of support activities, including:
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