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| Group 1 | Group 2 |
|---|---|
| P. Data Link Layer | 1. Ensures reliable transport of data over a physical point-to-point link |
| Q. Network layer | 2. Encodes/decodes data for physical transmission |
| R. Transport Layer | 3. Allows end-to-end communication between two processes |
| 4. Routes data from one network node to the next |
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