For the layman, one of the more common doubt is the difference between DoS and DDoS attacks. No, it’s not like some people think a misspelling. DoS stands for Denial of Service, and DDoS stands for Distributed Denial of Service.
Their name already can sense the difference. A DoS attack is made from a single machine to a victim. In a DDoS, the attack generation is instead Distributed across multiple computers. The advantage is obvious, in fact, with most machines is possible generate an attack much larger than a computer, hackers created botnets (networks of computers controlled by hackers) to tens of thousands of computers.
But the sheer scale of the attack is not the only advantage to hackers in a DDoS attack. A DoS attack is more easily mitigated, as it can not generate a lot of bandwidth, and especially it comes from a single IP address. It, especially in an attack on Layer 7, can be easily identified, and you can block the malicious IP in your firewall.
But when the attack comes from tens of thousands of different IP, these are much more sophisticated and it becomes difficult to identify what are the malicious IP to be blocked.
DoS attacks are now not very widespread because of the high processing efficiency achieved from networks and servers, while the DDoS not cease to grow in number and size. Suffice it to say that every year are touched new records, as the last on a DDoS attack of 400 Gbit.
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