![]() ![]() SYN Flood works at the transport layer. In order to understand these type of attacks, we need to understand how a TCP connection established first.Ī TCP connection is established by a 3-way handshake. These usually consist of volumetric attacks that aim to overwhelm the target machine with malicious traffic and consuming all resources and making server unresponsive. Network and Transport Layer AttacksĪs its name implies, these types of attacks focus on targeting the transport and network layers. More information about OSI layers can be found here. Here is a sample demonstration of the OSI model: OSI Model ![]() It is a reference model for how applications can communicate over a network. DoS TypesĭoS attacks can be divided into two main categories: Application layer attacks and network layer attacks. To understand these types of attacks we must understand what meant by layers. On the other hand, in DDoS(Distributed DoS) attacks, the attacker uses traffic from multiple sources distributed across to the Internet. In fact, the same logic lies behind them, except for a difference. In a DoS attack, attacker launches an attack from a single Internet connection. It may sound complicated, however, it is actually easy to imagine by seeing following gif: It is just an attempt to make a service unavailable to legitimate users. However, sometimes DoS might also be used for creating another attack floor for other malicious activities. Unlike other kinds of attacks, which establishes foothold or hijacks data, DoS attacks do not threat sensitive information. A denial of service (DoS) attack is an attempt to make a service unavailable.
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