The Cisco C3KX-NM-1G 4-Port Gigabit SFP is a fully managed Ethernet switch designed for use with Catalyst 3750X and 3560X switches. It provides high-speed Gigabit Ethernet connectivity with a maximum data transfer rate of 1 Gbps. This switch features 4 WAN ports and 4 LAN ports, all connected via SFP interfaces. Built by Cisco, a trusted brand in network management, this switch is ideal for enterprise networking setups that require reliable and efficient network connectivity.