5-2 CHAPTER 5: VIRTUAL LANS (VLANS)n It helps to control traffic.With traditional networks, congestion can be caused by broadcasttraffic that is directed to all network devices, regardless of whetherthey require it. VLANs increase the efficiency of your networkbecause each VLAN can be set up to contain only those devices thatneed to communicate with each other.n It provides extra security.Devices within each VLAN can only communicate with memberdevices in the same VLAN. If a device in VLAN Marketing mustcommunicate with devices in VLAN Sales, the traffic must cross arouting device.Types of VLANs Switch 3800 VLANs can be created according to the following criteria:n Physical portn IEEE 802.1Q tagn Ethernet protocol typen A combination of these criteriaPort-Based VLANsIn a port-based VLAN, a VLAN name is given to a group of one ormore ports on the Switch. A Switch port can be a member of only oneport-based VLAN.
