|  | 1.2 | Virtual LANs
| 1.2.2 | Frame filtering
Frame filtering is a technique that examines particular information about each frame. The concept of frame filtering is very similar to that commonly used by routers. A filtering table is developed for each switch, which provides a high level of administrative control because it can examine many attributes of each frame. Depending on the sophistication of the LAN switch, you can group users based on a station's MAC addresses, network-layer protocol types, or application types. Table entries are compared with the frames filtered by the switch. The switch takes the appropriate action based on the entries.