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"DNS poisoning", is also known as "DNS cache poisoning".
It is a technique that tricks a Domain Name Server or DNS server into keeping faith that it has received authentic information while in reality it's not like that. Once the DNS server is poisoned the information is cached for a while, in the mean while the effect of the attack is spread to the users of the server.
Generally, an Internet-connected computer always uses a DNS server provided by Internet Service Provider of the computer owner, or ISP. That DNS server basically serves the ISP's own customers only and contains a little amount of DNS information which is cached by the previous users of the server.
A "poisoning attack" on a single ISP DNS server can affect all the users who are being serviced directly by the compromised or affected server, or indirectly by its downstream server if applicable. In DNS poisoning the attacker exploits a flaw in the DNS (stands for Domain Name Server) software which can make it to accept incorrect and incomplete information. If the server does not accurately validate DNS responses to make it sure that they are coming from an authoritative source, the server will be ended up caching the incorrect and inaccurate entries locally and then also serve them to users that will be making same request.
It is a technique that tricks a Domain Name Server or DNS server into keeping faith that it has received authentic information while in reality it's not like that. Once the DNS server is poisoned the information is cached for a while, in the mean while the effect of the attack is spread to the users of the server.
Generally, an Internet-connected computer always uses a DNS server provided by Internet Service Provider of the computer owner, or ISP. That DNS server basically serves the ISP's own customers only and contains a little amount of DNS information which is cached by the previous users of the server.
A "poisoning attack" on a single ISP DNS server can affect all the users who are being serviced directly by the compromised or affected server, or indirectly by its downstream server if applicable. In DNS poisoning the attacker exploits a flaw in the DNS (stands for Domain Name Server) software which can make it to accept incorrect and incomplete information. If the server does not accurately validate DNS responses to make it sure that they are coming from an authoritative source, the server will be ended up caching the incorrect and inaccurate entries locally and then also serve them to users that will be making same request.
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