The best replacement for osi model is tcp ip model.

The best alternatives to osi model are rated as following:
★★★★★  tcp ip model
★★★  internet model
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★  dod model
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★  tcp\/ip
★  tcp/ip protocol suite
★  internet protocol suite
★  ip model
★  ss7
★  tcp\/ip suite
★  wap model
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Speaking about osi model, one probably shouldn't forget about tcp ip.

Other search terms related to osi model and their ratings are:
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★★★ functions of each layer
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osi model
tcp ip model
internet model