In his statement, Vint Cerf says that “the layered nature of the Internet describes the “what,” or its overall structural architecture. … The “transport” layers help route the user’s data packets to their correct destinations, while the application layers control how those packets are used by a consumer’s email program, web browser, or other computer application.”

He describes the structure and design of the Internet, showing how it was been able to work so well and is designed to expand. He continues, “This simple and flexible system creates a network of modular “building blocks,” where applications or protocols at higher layers can be developed or modified with no impact on lower layers, while lower layers can adopt new transmission and switching technologies without requiring changes to upper layers. Reliance on a layered system greatly facilitates the unimpeded delivery of packets from one point to another.”

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