By Patrick J Conlan; Cisco Systems, Inc
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Extra info for Cisco network professional's advanced internetworking guide
When information in the database is modified, the revision number is incremented. When there is a new change, then the server where the change was made originates the change and sends out an advertisement telling the other switches there is a change. The other switches verify the revision number against their own. The advertised revision number should now be one higher than their own, indicating the other switches should take the change. VTP then synchronizes the change on all of the other switches.
Layer 2 Switching Whenever network administrators talk about the access layer and connecting devices to the network, the discussion of collision domains and broadcast domains always arises. Old devices like hubs do not provide separation of traffic on the network. The bridge, which provided for collision domain separation, followed the use of hubs. But bridges did so slowly with a lot of processor time and fewer ports than are needed on a network today. For your current design needs, an extensive selection of Layer 2 Ethernet switches provides a wide variety of choices and offers many benefits over older network access devices.
These APs can be controlled by a WLC. I am going to show you some of them. Both the 1100 and 1200 series access points are upgradeable. There is also a new series of APs and WLCs that you can get. They are called the express versions. These controllers and APs are for smaller deployments, in small- and mediumsized businesses (SMB). They typically support a smaller number of APs and don’t offer all of the functions that would be used in a large enterprise implementation. The express devices can be a good place to start in learning about lightweight WLANs.