3.8. Identifying the Main Characteristics of VLANs

Virtual local area networks (VLANs) are logical subnets that are formed using switches. One of the advantages of VLANs is that they do not have to conform to the physical characteristics of a building but instead can be set up in any manner that the administrator chooses. Another advantage is that VLANs can be formed without the use of routers. For example, suppose you have a four-story building that has sales personnel on all four floors of the building mixed in with other departments. Now, suppose you have a switch located on each of the floors. Without VLANs, your sales people's computers would have to be attached to the switch that eventually connects to the router that created the subnet. ...

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