The attacker can now intercept and modify network traffic sent to and from the legitimate device. It then forwards the frame out of that port, and the two devices communicate this way. The switch receives this frame and uses the destination MAC address to pinpoint the correct port in the MAC Address Table.
When a device on the network wants to communicate with another, it sends an Ethernet frame containing, among other information, the source MAC address and the destination MAC address. The MAC address is globally unique for each component, and every entity inside the network has a different hardwired address given by its manufacturer. This switch is responsible for keeping track of which device is connected to each port by maintaining a table called the “MAC Address Table”, which maps each device’s MAC address to the corresponding switch port. In a switched network, each device (e.g., computer, server, printer) is connected to a switch. Since these attacks target switched LAN networks, let’s quickly examine how such a network generally works.
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