DNS Cache Poisoning

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Background: When data provided to a caching name server that has not originated from a non-authentic source (in other words, a DNS source), this is called DNS cache poisoning. Once a DNS server receives this non-authentic data and caches it for future performance increases, it will be considered “poisoned” because it will thereafter supplying server clients with that non-authentic data.

Q: In order to determine the end-time for DNS cache poisoning, which of the below DNS records should you examine?

a. MX

b. NS

c. PTR

d. SOA

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