Which OSI layer is concerned with converting packets into suitable frames for transmission?

The Data Link Layer is responsible for converting packets into suitable frames for transmission. This layer serves as a mediator between the network layer and the physical layer of the OSI model. It takes the packets from the network layer and encapsulates them into frames, which include not only the payload (the packet) but also headers and footers that contain important control information (such as source and destination MAC addresses) for managing the data transfer over the physical medium.

This layer is crucial for ensuring error detection and correction during the transmission process, as well as for managing access to the physical medium to prevent collisions in scenarios where multiple devices are trying to transmit data simultaneously. By framing the data, this layer essentially prepares it for transmission over various types of physical networks, whether wired or wireless.

In contrast, the other OSI layers focus on different aspects: the Physical Layer deals with the actual transmission of raw data bits over a physical medium, the Application Layer interacts directly with user applications, and the Transport Layer manages end-to-end communication and data integrity. Each layer has its distinct responsibilities, but it's the Data Link Layer that specifically handles the framing of packets, making it the correct choice.