When someone says "A is based on top of B", it generally means that A is built using the functionality provided by B. So for your first example, it means that TCP relies on IP for its lower-level functionality.
What does "Based on top of" mean? [closed]
Frage
I always see this term and never understood it, for example:
TCP is being used on top of IP (Internet Protocol).
Here's another one:
Several of the RemObjects SDK components are based on top of Indy controls.
Lösung
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