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What is the Three-way handshake? How can it be used to create a DOS attack?
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Answer Posted / chaitanya
The three-way handshake is a cornerstone of the TCP suite: SYN, SYN/ACK, ACK. SYN is the outgoing connection request from client to server. ACK is the acknowledgement of the server back to the client, saying that yes I hear you, let’s open a connection. SYN/ACK is the final connection, and allows the two to speak. The problem is that this can be used as a very basic type of Denial of Service Attack. The client opens up the SYN connection, the server responds with the SYN/ACK, but then the client sends another SYN. The server treats this as a new connection request and keeps the previous connection open. As this is repeated over and over many times very quickly, the server quickly becomes saturated with a huge number of connection requests, eventually overloading its ability to connect to legitimate users.
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