DDoS uses multiple devices to flood a target with malicious traffic and exhaust the resources available to an application, network, or service so that the user cannot gain access. In a DDoS attack, the victim’s PC is loaded from the packet of data sent from multiple locations. It is much faster than a DoS attack. It is much more difficult to detect these kinds of attacks because they are generated from multiple locations.

 

In DoS attacks, it uses a single device to target the victim’s system. In DoS attacks, the victim’s system is loaded with the packet of data sent from a single location, it is slower as compared to DDoS. It can be blocked easily because only one system is used. This is the main reason why these are easy to trace, and their volume is much lower as compared to DDoS.

 

The botnet concept is also the most common thing from which the attack is generated. These are a group of compromised devices. A botnet, also known as a robot network, is a group of PCs with malware that is heavily influenced by a single attacker, known as the “bot-herder.” Every individual machine heavily influenced by the bot-herder is known as a bot. From one main issue, the attacker can order each PC on its botnet to do an organized criminal activity one by one.

There are many types of distributed denial-of-service attacks. There are thousands of ways that an attacker can attack victims. But these types are summarized in only three main broad categories, which generally attackers follow.

• Volumetric DDoS Attacks: The main target of the attacker is to flood the victim’s application or server with voluminous fake requests or impregnate the bandwidth of the attacked site, and the magnitude is measured in bits per second. 
• Application Layer Attack: Actual software that provides services, for instance, Apache server which is considered the most popular web server on the internet, or any other service offered by the cloud provider, is the main target in the application layer. 
• Protocol Attacks: SYN floods, Smurf DDoS, and Ping of Death are some of the attacks included in this. Intermediate communication tools or actual servers, for instance, load balancers and firewalls, are consumed by the attackers in these attacks.

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