ARP is a widely used protocol that resolves an IP address to a MAC address. In most cases, ARP works well to ensure devices can find one another. However, the protocol was standardized many years ago, and there has never been a way to ensure the authenticity of ARP messages.

As a result, there are a few ARP attacks that can misdirect traffic and interfere with normal network behavior. In response, we'll also take a look at some of the ways to defend against these types of attacks.