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OSI
Layers Model
Transport Layer
The transport layer makes sure that the data arrives without
errors, in the proper sequence and in a reliable condition.
It uses flow control to make sure that information is sent
at the proper speed for the receiving device to be able to
handle it, and it repackages large data into smaller
messages and then back again at the receiving node. An
example protocol at this layer is the Transmission Control
Protocol (TCP). Layer 4 switches can use the port
information found in the TCP header to provide QoS (Quality
of Service) and load balancing. To learn more about
multi-layer switches, visit the Products link.
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