11.5. Switching and Network Security
Security is becoming more critical to us every day, so just how do you stop people from simply plugging a host into one of your switch ports—or worse, adding a hub, switch, or access point into the Ethernet jack in their office? Remember that, by default, MAC addresses will just dynamically appear in your MAC forward/filter database. Here I describe how you can ensure port security, and how you can take control of each port to provide better security for your network resources.
11.5.1. Port Security/Authentication
Figure 11.17 illustrates how a host plugged into a switch can restrict port security by MAC address.
Figure 11.17. Port security
There are a few ways to ensure port security on your switches. ...
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