ZyXEL UAG4100 User Guide - Page 174

Chapter 10 Interfaces Table 72 Configuration > Network > Interface > PPP > Add (continued) LABEL DESCRIPTION OK Click OK to save your changes back to the UAG. Cancel Click Cancel to exit this screen without saving. 10.5 VLAN Interfaces A Virtual Local Area Network (VLAN) divides a physical network into multiple logical networks. The standard is defined in IEEE 802.1q. In this example, there are two physical networks and three departments A, B, and C. The physical networks are connected to hubs, and the hubs are connected to the router. Figure 119 Example: Before VLAN Alternatively, you can divide the physical networks into three VLANs. Figure 120 Example: After VLAN Each VLAN is a separate network with separate IP addresses, subnet masks, and gateways. Each VLAN also has a unique identification number (ID). The ID is a 12-bit value that is stored in the MAC header. The VLANs are connected to switches, and the switches are connected to the router. (If one switch has enough connections for the entire network, the network does not need switches A and B.) UAG Series User's Guide 174