CompTIA Network+ Practice Test 2026 – Comprehensive Exam Prep

The Data Link layer is responsible for several critical functions that facilitate communication over a local network. Among these functions, it handles frame creation, which involves encapsulating packets into frames for transmission, and MAC addressing, which assigns unique identifiers to devices on a local network to ensure that data is sent to the correct destination.

Physical addressing is also a function of the Data Link layer, as it deals with how data packets are physically addressed for transmission, including the use of hardware addresses (MAC addresses) to control access to the shared media. These functions are essential for ensuring that data is correctly framed, addressed, and sent over the network layer to the physical medium.

Fragmentation of packets, on the other hand, occurs at the network layer rather than the Data Link layer. Fragmentation is the process of breaking down packets into smaller pieces to accommodate the size limitations of the network medium. Thus, it is not a function attributed to the Data Link layer, making it the correct choice for this question.