Your customer is receiving inappropriate traffic from a rival corporation which is using a fixed block of IP addresses that they own. No legitimate traffic is exchanged between the two companies…

Your customer is receiving inappropriate traffic from a rival corporation which is using a fixed block of IP addresses that they own. No legitimate traffic is exchanged between the two companies. You must secure the customer's network from a potential attack by their rival corporation with the lowest performance impact. Which network device will allow you to accomplish this task?