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A DDoS attack tries to take down your site by flooding it with fake traffic. DDoS protection filters that traffic before it reaches your server.
What a DDoS attack is
A distributed denial-of-service (DDoS) attack sends a flood of requests from many sources to overload your server and take your site offline.
How mitigation works
Mitigation analyzes traffic at the network edge and discards the malicious part, letting only legitimate traffic through. Your server never receives the attack.
Why it should be included
Many providers charge for protection separately or per attack. Included by default, you do not have to configure anything or pay extra when an attack happens.
DDoS included at ViaHost
At ViaHost, DDoS mitigation is always on and included in VPS and hosting, at no cost and with no per-attack limit.
FAQ
No. Filtering happens at the network edge and only affects attack traffic; legitimate traffic passes normally.