In chart 1, there is a layer 2 that switches without setting VLAN. Any broadcastframe will be transmitted to the other ports except the send port. For example, abroadcast information is sent out from port 1 then transmitted to port 2,3and 4.In chart 2, red and blue indicate two different VLANs in the switch, and port 1and port 2 belong to red VLAN, port 3 and port 4 belong to blue VLAN. If abroadcast frame is sent out from port 1, switch will transmit it to port 2, theother port in the red VLAN and not transmit it to port3 and port 4 in blueVLAN. By this means, VLAN divide the broadcast domain via restricting therange of broadcast frame transition.Note: chart 2 use red and blue to identify the different VLAN, but in practice,VLAN uses different VLAN IDs to identify.QoS ConfigurationLink LayerDiscovery Protocol(LLDP) SettingsEnable LLDP Enable LLDP by selecting it.Enable LearningFunctionAfter enabling LLDP Learn, telephone canautomatically learn the data of DSCP, 802.1p, VLANID from the switch. If the data is different from thedata of the LLDP server, telephone will change itsown value as the value of the switch (Synchronouswith VLAN in switch).PackageInterval(1-3600)The time interval of sending LLDP Packet.Quality of Service