This manual provides detailed instructions for configuring and managing the DGS-3130 Series Layer 3 Stackable Managed Switch via its Web User Interface (Web UI). It covers various aspects including system settings, port configuration, network features (VLAN, STP, LLDP), routing protocols (RIP, OSPF), Quality of Service (QoS), Access Control Lists (ACL), security features (Port Security, 802.1X, AAA), monitoring tools, and save/backup functions. The guide assumes users have prior experience with Ethernet and networking principles. It also details conventions used in the manual and important notes, notices, and cautions for safe operation. The Web UI offers a graphical interface for managing the switch's features.