Final answer:
The Physical layer of the TCP/IP model determines how data is physically sent through the network
Step-by-step explanation:
The layer of the TCP/IP model that specifies details of how data is physically sent through the network is the Physical layer. This layer defines the electrical, mechanical, and physical specifications for devices that interface with the network medium. It is responsible for converting the digital bits into signals that can be transmitted over the network medium.
For example, in the case of twisted-pair copper wire, the Physical layer defines how the digital bits are translated into electrical signals that can be transmitted through the wire. It determines the voltage levels, signaling scheme, and transmission medium used.
Overall, the Physical layer ensures that data can be reliably transmitted across different network mediums, such as coaxial cable, optical fiber, or twisted-pair copper wire, by addressing the physical aspects of data transmission.