If you need a quick refresher of Internetworking concepts, this presentation would be a great help.
Some of the key topics that will be covered are the following:
- OSI Model and its famous 7 Layers
- Ethernet and Data Encapsulation
- Cisco's Baseline Hierarchical Infra Model
Enjoy. Let me know what you think in the comment section.
Note: The presentation is best viewed on desktop rather than mobile (maximize and landscape).