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All of the following are countermeasures that can be used to fight ARP attacks, except:
Define static ARP mappings for critical systems
Use an IDS to detect anomalies in system traffic and changes in ARP traffic
Upgrade DNS to DNSSEC.
Monitor ARP caches for MAC-to-IP-address mappings
All of these describe measures that can be used to fight ARP attacks except "Ugrading DNS to DNSSEC." This is a countermeasure for DNS poisoning, spoofing, and hijacking.
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