In which layer of the OSI model would you find Ethernet, Switches, and Bridges?

The data link layer is the second layer of the OSI model, and it is responsible for enabling communication between devices on the same local network. This layer handles the framing of data packets and provides error detection and correction to ensure reliable data transmission. Ethernet, switches, and bridges operate at this level, facilitating the transfer of data across a physical network.

Ethernet is a widely-used networking protocol for local area networks (LANs) that defines how data packets are formatted and transmitted over a network. Switches are networking devices that operate in the data link layer by receiving incoming data packets and directing them to their destination within the same network, optimizing traffic flow. Bridges also function at this layer, connecting two or more network segments to allow communication between devices within those segments, thereby ensuring that data can traverse a network without unnecessary duplication or collisions.

In contrast, the other layers listed serve different functions. The network layer is involved in routing data between different networks, the transport layer manages end-to-end communication and reliability, and the session layer establishes, manages, and terminates sessions between applications. Therefore, the presence of Ethernet, switches, and bridges uniquely identifies the data link layer as the correct choice.