Hello everyone my name is vijay kumar Devireddy and I am glad to have you back on my episode 79 today we're going to discuss about In the last lesson, we talked about the concept of DNS poisoning.In this lesson, I want to cover the concept of ARP poisoning with you fairly quickly.Now ARP stands for the address resolution protocol,like you learned back in Network Plus,and it's used to convert an IP address into a MAC address.If you remember back from Network Plus and our OSI model lesson,as data moves down the OSI stack, it uses IP addresses to transmit packets all over the world from router to router.But once it finds the right router,that router converts that IP address into a MAC address and passes it on to the switches inside of its own network,and that is going to help it to deliver the information using frames inside the data link layer.Now ARP poisoning is going to exploit the way that an ethernet network works.It's going to enable an attacker to steal,modify, or redirect frames of information on the network.The concept here is that the attacker's going to associate their MAC address with the IP address of another device within the network.This way, whenever the router asks for the MAC address that's associated with that IP,they get the attacker's MAC address instead of the legitimate user's.This allows the attacker to essentially take over any session that would involve MAC addresses at the layer two of the OSI model.Also, if the attacker wanted to get really creative here,they could set up a man in the middle using this technique by taking over the MAC address first,then passing the data back and forth between the victim and the rest of the network.To prevent ARP poisoning,you should set up good VLAN segmentation within your network,and also set up DHCP snooping to ensure that IP addresses aren't being stolen and taken over by an attacker.