Why even IP?

Understanding IP's role in the network protocol stack

This question tests whether you can articulate the foundational purpose of the Internet Protocol within the broader context of networked communication. It is a conceptual question rather than a computational one, and it rewards clarity of thinking about what problem IP solves and where it sits relative to other layers.

To answer effectively, you need to understand what distinguishes IP from the transport layer above it and the link layer below it, and why that distinction matters in practice. This is the kind of question that reveals whether you have internalized the layered model of networking or merely memorized facts about protocols.

• The OSI and TCP/IP models and their layer separation
• Routing vs. reliability vs. physical transmission
• How IP enables end-to-end communication across heterogeneous networks