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what is dos attack?

A denial-of-service (DoS) is any type of attack where the attackers (hackers) attempt to prevent legitimate users from accessing the service.

In a DoS attack, the attacker usually sends excessive messages asking the network or server to authenticate requests that have invalid return addresses.

The network or server will not be able to find the return address of the attacker when sending the authentication approval, causing the server to wait before closing the connection.

When the server closes the connection, the attacker sends more authentication messages with invalid return addresses.

Hence, the process of authentication and server wait will begin again, keeping the network or server busy.
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