What security countermeasure is effective for preventing CAM table overflow attacks?
- DHCP snooping
- Dynamic ARP Inspection
- IP source guard
- port security
Explanation: Port security is the most effective method for preventing CAM table overflow attacks. Port security gives an administrator the ability to manually specify what MAC addresses should be seen on given switch ports. It provides a method for limiting the number of MAC addresses that can be dynamically learned over a switch port.
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