"In computing, a denial-of-service attack ( DoS attack; UK: /dɒs/ doss US: /dɑːs/ daas[1]) is a cyberattack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to a network. -The Wikipedia definition of denial-of-service attack. This is a very basic concept. Someone makes use of their own resources to disrupt the functioning of other machines on a network."
"One of the commonly argued "first Distributed Denial-of-service (DDoS) attacks" was against the Internet Service Provider (ISP) Panix in the mid-90s. There were of course many prior technical examples on older internet services, but this was one of, if not the, first major examples of such an attack on the modern World Wide Web. This attack had numerous computers start to initiate a Transmission Control Protocol (TCP) connection with the ISPs servers, but never finishing the handshake protocol that finalized the connection. This consumes the server's resources for managing network connections and prevents honest users from accessing the internet through the ISP's servers."
Denial-of-service (DoS) attacks aim to make machines or network resources unavailable by disrupting services of hosts connected to networks. Attackers use their own resources to impair the functioning of other machines on a network. One early major DDoS example targeted ISP Panix in the mid-1990s, where many computers initiated TCP connections but never completed the handshake, consuming server resources and blocking legitimate users. DDoS events have remained frequent and required substantial defensive infrastructure. The blockchain is a core Bitcoin component and spam transactions must be evaluated against the blockchain's intended service to be called DoS.
Read at Bitcoin Magazine
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