What layer of the OSI Model does an Ethernet switch operate at?

An Ethernet switch operates at the Data Link Layer of the OSI Model, which is Layer 2. This layer is responsible for the node-to-node data transfer and error detection and correction. Ethernet switches facilitate communication between devices within the same local area network (LAN) by using MAC (Media Access Control) addresses to forward frames to the correct destination.

The Data Link Layer is crucial for ensuring that the data packets are correctly packaged and transmitted over the physical medium. The switch learns the MAC addresses of the devices connected to it, effectively creating a MAC address table that helps in directing the data frames to their intended recipients. This process improves network efficiency by reducing unnecessary data traffic and confirming that data reaches the correct device.

In contrast, the other layers mentioned do not pertain to the specific functions of an Ethernet switch. The Application Layer deals with network services to end-users, the Transport Layer focuses on the reliable transmission of data segments across a network, and the Network Layer is responsible for logical addressing and routing of packets. Thus, the accuracy in identifying the Data Link Layer is what aligns perfectly with how an Ethernet switch operates.