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31 Days Before Your CCENT Certification by Scott Bennett

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CCNA Discovery 2, Chapter 5

5.4.3: As soon as a switch is properly configured and connected in the wiring closet, an unauthorized user could connect to a wall jack and attempt to access the network. You can enable a feature called port security to limit the number of MAC addresses that a switch can learn for each port. If you set the MAC address to port ratio to 1, the switch recognizes only the first MAC address it learns as the secure address. Port security is similar to MAC address filtering on a Linksys device. You can manually configure a MAC address for each port, or you can allow the switch to dynamically learn the MAC address. You can view and clear the MAC address table on a switch with the following commands in privileged EXEC mode: ...

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