In TCP/IP, which layer is responsible for IP addressing?

The Internet Layer is responsible for IP addressing within the TCP/IP model. This layer is crucial for facilitating communication between different devices across a network by providing mechanisms for routing data packets. In this context, IP addresses are assigned to devices to identify them uniquely on a given network, allowing for data to be sent to the correct destination.

The Internet Layer works closely with protocols like the Internet Protocol (IP), which defines how data packets should be addressed and routed based on the IP addresses. This functionality is essential for ensuring that data can navigate from the source device to the destination device across potentially multiple networks.

In contrast, the Application Layer focuses on end-user services and application-level communication, while the Transport Layer is involved in ensuring reliable communication between devices, such as managing data flow and ensuring error recovery. The Network Layer, often used interchangeably with the Internet Layer in different contexts, generally corresponds to Layer 3 in the OSI model but does not directly refer to IP addressing in the TCP/IP context.

Therefore, recognizing the Internet Layer's fundamental role in managing IP addressing helps underscore its importance in facilitating network communication and connectivity.