What are DDoS attacks?

Depending on the type of object that is disabled during a DDoS attack, there are 4 classes of attacks that are carried out at different levels according to the OSI model.

ATTACK TYPE

OBJECT OF ATTACK

First grade

(L2)

"Clogging" the channel

NTP-amplification

DNS-amplification

RIP-amplification

ICMP Flood

UDP Flood

SYN Flood

etc.

Second grade (L3)

Disruption of the network infrastructure

attacks causing BGP routing problems

attacks leading to problems with network announcements

problems with transit network equipment

etc.

Third grade

(L4)

Exploiting TCP Stack Weaknesses

TCP Connection Flood

SlowLoris

Slow POST

etc.

Fourth grade (L7)

Degradation of the web application

GET Flood

POST Flood

HTTP Flood

multiple retrievals of specific information from a database, memory, or disk, as a result - the exhaustion of server resources

etc.

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