June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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When does DNS use TCP instead of UDP?
Most of the time, DNS happens over UDP. It's lightweight and faster than TCP. There have been trade-offs as a result of the design decision. It's easier to spoof UDP packets, so you have to worry about things like cache poisoning or DDoS attacks involving forged packet headers.
But nameservers still need to be available on TCP as well as UDP. The following will explain why.
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