Top 10 DNS attacks likely to infiltrate your network
The problem with traditional firewalls is that they leave port 53 open, which is for DNS queries. So they are not always effective in protecting against DNS-based DDoS attack such as amplification, reflection, etc. They require extremely high compute performance to accurately detect DNS-based attacks, making deep inspection an impractical approach in terms of cost and the number of distribution points that are needed. Hence traditional protection is ineffective.
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Story added 23. February 2015, content source with full text you can find at link above.
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