What security countermeasure is effective for preventing CAM table overflow attacks?

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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.

What security countermeasure is effective for preventing CAM table overflow attacks?

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