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I'm learning about ARP spoofing attacks. Can a router or switch defend against ARP attacks?

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    Yes it can. There are many answers to this on the Internet. Have you looked at those? – schroeder Oct 22 '15 at 3:56
  • @EmileCormier not helpful in the comment thread to a question. Please raise this sort of thing in our Meta. Also note that I did not answer with "just google it" but asked if research had been done. – schroeder Mar 6 '18 at 23:07
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Many modern routers implement arp-spoofing protection as an inbuilt feature.

As Sunny points out, old-school switches ran on Layer 2, and typically didn't analyse Layer 3 (Network Layer) whereas routers do. That said, more modern switches may incorporate functionality that you would expect in a router, and even up to Layer 7 handling QoS and Deep Packet Inspection.

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Usually a switch is not intelligent enough to prevent arp poisoning. However if the traffic between two host reach the router then it can prevent arp poisoning.
See this http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/dynarp.html

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