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I am studying network security.

I am wondering about ARP Spoofing. As you know ARP and ICMP only work at Layer 3 (network). But ARP spoofing attacks layer 2 (data link: mac address table).

I don't understand the problem.

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    You are completely wrong about ARP being layer 3. That's why you are confused. – schroeder Mar 16 '17 at 13:18
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From this answer, ARP is layer 2 packet. Also from Wiki you can find this:

The Address Resolution Protocol is a request and response protocol whose messages are encapsulated by a link layer protocol

You might be confused because of OSI model. However, ARP was not developed in the OSI networking framework.

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