This glossary focuses on network and application security
terms with many DDoS-related definitions, a "DDoS-pedia"
– its goal is to provide a central place
for hard to find web-scattered definitions on this topic.
DNS servers perform their hierarchical lookups by means of recursion, and rather
than limit the ability to make recursive requests to local or authorized
clients, DNS servers referred to as Open Resolvers allow recursive DNS requests
from any client. Open Resolvers (especially with the newer RFC specifications
supporting extensions to the DNS system such as IPv6 and DNSSEC) require the
ability to send DNS replies much larger than their respective requests, and an
attacker can abuse this fact to amplify his or her available outgoing bandwidth
and subsequently direct it at a target in a DNS Amplification Attack.
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