Configuration Guide - Ethernet Switching
The attacker's machine will be delivered with all the frames between the victim and another machines. The attacker will be able to capture sensitive data from network. Cisco switches are packed with in-built security feature against MAC flooding attacks, called as Port Security.
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What is MAC Flooding? How to prevent it?
It would encapsulate an Ethernet frame and send it off toward the switch. The switch would then perform a lookup on its MAC address table to determine whether it knows which port to send the traffic to; since no matching entries exist in the switch's tables, it would flood the frame out all of its interfaces except the receiving port.
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- The Switched Environment (1.2).
Because the frame was sent out to all of the switch's other ports, it would be received by the target server. Assuming that the server wants to respond to PC1, it would sent a new frame back toward the switch. Listing 1 shows what the MAC address table would look like at this point.
This process repeats as devices continue to send traffic to each other. An important detail to remember is that the MAC address table timeout is typically short Cisco's default is five minutes , so an entry is left in the table itself only for that specified amount of time before the timeout expires and the entry is removed from the table.
Now we will move on to the question of how the devices get the destination MAC addresses to begin this process; in a word, ARP.
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