| Protocol Layers |
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| n | Layers
are logical steps with well-defined |
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| purposes:
OSI reference model |
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| n | We
are mainly interested in lower 4 layers: (1) |
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| Physical,
(2) Link, (3) Network, (4) Transport |
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| Transport |
| Transport |
| TCP |
| Network |
| Network |
| IP |
| Link |
| Link |
| Link |
| Link |
| Physical |
| Physical |
| Physical |
| Physical |
