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In a link-layer switch, the relevant layers of the TCP/IP protocol suite are primarily:
Link Layer (Network Interface Layer): This layer is responsible for the physical transmission of data over a specific link (like Ethernet). It includes protocols that manage how data frames are sent over the network medium, such as addressing and error detection.
Network Layer: While a link-layer switch primarily operates at the link layer, some switches can also perform basic functions related to the network layer, particularly in the case of Layer 3 switches, which can route traffic based on IP addresses.