Which layer is responsible for sending frames between devices on the same local network?

• A. Transport
• B. Data-Link
• C. Network
• D. Session

Answer: (B)

The data-link layer handles node-to-node communication on a local network, turning packets into frames and delivering them to the correct device on the same LAN. It provides framing, addressing, and error detection, using MAC addresses to identify devices and switches (which operate at this layer) to forward frames within the local segment. Think of Ethernet frames and Wi‑Fi frames as the units used for local delivery between devices on the same network.

In contrast, the network layer is responsible for routing packets between different networks, the transport layer handles end-to-end delivery between hosts, and the session layer manages connections between programs. So when you're sending data between devices on the same local network, it's the data-link layer that actually constructs and forwards those frames using the local addressing.