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OSI referece model and functionality of its layers

Provide the following information on the OSI reference model:

What are the advantages of the OSI reference model?
Describe the functionality at each of the seven layers of the OSI model?
Discuss the purpose of headers.
Using the layers of the OSI model as a reference, explain and diagram how repeaters, hubs, bridges, switches, routers, and gateways function in forwarding packets from one host to another through each device respectively.

With references

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The solution consists of conceptual knowledge of OSI model and its seven layers and basic knowledge of repeaters, switches, hubs, gateways, routers.