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Assessment Title
Rule Text
The Cisco router must be configured to have Gratuitous ARP disabled on all external interfaces.
Description
Discussion Text
A gratuitous ARP is an ARP broadcast in which the source and destination MAC addresses are the same. It is used to inform the network about a host IP address. A spoofed gratuitous ARP message can cause network mapping information to be stored incorrectly, causing network malfunction.
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