What is the internet protocol stack?

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What is the internet protocol stack?
There are many different protocols that run on the internet, given that protocols power every internet service. By arranging protocols hierarchically, or into a protocol stack, this allows us to separate concerns and ensure that protocols can focus on doing a specific job well. Higher-level protocols can rely on functionality from lower-layer protocols and use them as needed to build interesting services.

Credits: Talking: Geoffrey Challen (Assistant Professor, Computer Science and Engineering, University at Buffalo). Producing: Greg Bunyea (Undergraduate, Computer Science and Engineering, University at Buffalo).