A Layer /Layer developer works on networking protocols. Layer , or the Data Link Layer, involves protocols like Ethernet and PPP that handle communication between devices on a network. They ensure error-free data transfer and manage the physical layer's raw data transmission. Layer , or the Network Layer, involves protocols like IP that handle the routing of data across networks. Developers create and maintain these protocols, ensuring efficient data transfer and secure, reliable connections. They also troubleshoot network issues, optimize performance, and work closely with other teams to integrate these protocols into larger systems.