How does the Transport Layer interact with the Network Layer?

How does the Transport Layer interact with the Network Layer?

• A. The Transport Layer passes data down to the Network Layer for routing to the destination.
• B. The Network Layer passes data up to the Transport Layer for processing by the application.
• C. They operate independently with no interaction.
• D. The Transport Layer handles IP addressing directly.

Answer: (A)

The Transport Layer interacts with the Network Layer by passing the data it receives from the application down to the Network Layer for routing to the destination. The transport layer prepares segments (with port numbers) and hands them to the Network Layer, which adds IP addressing and handles routing. On the receiving side, the Network Layer passes the packet up to the Transport Layer, which uses the port information to deliver the data to the correct application. IP addressing is a responsibility of the Network Layer, not the Transport Layer, so that layer does the routing work while the Transport Layer focuses on end-to-end delivery and port multiplexing.

The Transport Layer interacts with the Network Layer by passing the data it receives from the application down to the Network Layer for routing to the destination. The transport layer prepares segments (with port numbers) and hands them to the Network Layer, which adds IP addressing and handles routing. On the receiving side, the Network Layer passes the packet up to the Transport Layer, which uses the port information to deliver the data to the correct application. IP addressing is a responsibility of the Network Layer, not the Transport Layer, so that layer does the routing work while the Transport Layer focuses on end-to-end delivery and port multiplexing.