Before we proceed to DNS Poisoning lets have some look on basics. So lets take look on what is DNS first. You already know internet runs on TCP/IP model or you can say internet protocol stack.TCP/IP stack specifies and uses IP addresses (example : 204.87.98.34) to route data between source and destination computer.Every computer in the world that is connected in network have an IP address. Since remembering IP addresses are difficult each IP address is associated with a name like www.google.com which is also known as domain name.Domain names are easy to remember but original TCP/IP stack needs IP address for communication not the domain name
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