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End System (ES), a concept in OSI networking, refers to a host or node in an OSI network. Another key concept in an OSI network is the intermediate system (IS), which refers to the routers and switches that carry information through the network.

End System (ES), a concept in OSI networking, refers to a host or node in an OSI network. Another key concept in an OSI network is the intermediate system (IS), which refers to the routers and switches that carry information through the network.