3 Main Types of DDoS Attacks and How to Prevent Them
By Karthi | November 13, 2026
Distributed denial-of-service (DDoS) attacks are among the most prevalent threats to organizations. Understanding the Types of DDoS Attacks is essential, as these attacks inundate sites, applications, and web services with streams of malicious traffic. Such traffic either causes their speed to drop or prevents them entirely for legitimate users.
Knowing the types of DDoS attacks and how to protect your infrastructure from them is key, whether you run an eCommerce store, a SaaS platform, a gaming server, or any enterprise website.
This guide will cover what a DDoS attack is, how it works, the three main types of DDoS attacks, and best practices for preventing them.
What Is a DDoS Attack?
A DDoS attack is essentially the legitimate use of an online service pushed too far. For example, a website may be able to handle a certain number of requests per minute. If that number is exceeded, the website’s performance is degraded, or it may become completely inaccessible. This overload may be caused by an attack or even legitimate use, such as an e-commerce site being overwhelmed on Black Friday or a ticket sales platform going down when sales for a popular event open.
DDoS attacks can overwhelm a target at several levels. For example, a web application may have a maximum number of requests it can handle. Likewise, the server it runs on may have a limit on the number of simultaneous connections it can manage. A corporate network may also have bandwidth restrictions that an attacker could overwhelm. Exceeding any of these thresholds will result in a DoS attack or a DDoS attack if the attack uses multiple IP addresses against the system.
How Does a DDoS Attack Work?
A DDoS attack seeks to overwhelm the devices, services, and network of its intended target with fake internet traffic, making them inaccessible or useless to legitimate users.
DoS vs DDoS:
A distributed denial-of-service attack is a subtype of the broader denial-of-service (DoS) attack. In a DoS attack, the attacker uses a single internet connection to flood a target with fake requests or exploit a cybersecurity vulnerability. DDoS attacks are much larger in scale. They use thousands, or even millions, of connected devices to achieve their goal. The sheer number of devices involved makes DDoS attacks much harder to defend against.
Botnets:
Botnets are the main way distributed denial-of-service attacks are carried out. The attacker hacks into computers or other devices and installs a malicious piece of code, or malware, called a bot. Together, the infected computers form a network called a botnet. The attacker then directs the botnet to overwhelm the victim’s servers and devices with more connection requests than they can handle.
What Are the 3 Types of DDoS Attacks?
Understanding the Types of DDoS Attacks helps organizations identify how attackers target different layers of their infrastructure.
DDoS attacks are generally divided into three main categories based on which layer of the network they target: volumetric, protocol, and application layer attacks.
1. Volumetric Attacks
Volumetric attacks target network bandwidth by flooding a server, network, or infrastructure with extremely large amounts of traffic.
Instead of exploiting specific protocol weaknesses, they consume available bandwidth and network capacity, preventing legitimate users from accessing the service.
Common Examples
- UDP Flood
- ICMP Flood (Ping Flood)
- DNS Amplification
- NTP Amplification
- Memcached Amplification
How They Work
Attackers generate massive traffic volumes measured in gigabits or terabits per second. Once bandwidth is saturated, legitimate traffic can no longer reach the server.
Impact
- Website downtime
- Internet congestion
- Slow response times
- Network saturation
2. Protocol Attacks
Protocol attacks target weaknesses in network protocols and infrastructure devices such as firewalls, routers, and load balancers.
Instead of consuming bandwidth, they deplete server or networking resources.
Common Examples
- SYN Flood
- Ping of Death
- Smurf Attack
- Fragmentation Attack
How They Work
For example, in a SYN flood attack, attackers send thousands of TCP handshake requests but never complete them. The server keeps waiting for responses and eventually runs out of available connections.
Impact
- Firewall exhaustion
- Router overload
- Server resource depletion
- Connection failures
3. Application Layer Attacks
Application layer attacks target Layer 7 of the OSI model, where websites and APIs process user requests.
These attacks are often the hardest to detect because they closely mimic normal user behavior.
Common Examples
- HTTP Flood
- HTTPS Flood
- Slowloris Attack
- API Request Flood
How They Work
Instead of sending millions of packets, attackers send what look like legitimate requests to pages that require significant processing power, such as login pages, search functions, or shopping carts.
Even a relatively small amount of malicious traffic can overwhelm the application.
Impact
- Slow websites
- API failures
- Database overload
- Application crashes
| Attack Type | Primary Target | Goal | Examples |
| Volumetric | Network bandwidth | Saturate internet connection | UDP Flood, DNS Amplification |
| Protocol | Network infrastructure | Exhaust server resources | SYN Flood, Smurf Attack |
| Application Layer | Web applications | Overload application services | HTTP Flood, Slowloris |
Understanding the Types of DDoS Attacks can also help organizations choose the right security measures based on the traffic patterns, infrastructure weaknesses, and resources targeted by an attack.
How to Prevent DDoS Attacks: Best Practices
Preventing DDoS attacks requires a proactive approach to security and a clear understanding of the Types of DDoS Attacks that can target your infrastructure. By combining regular security assessments, system hardening, network protection, and DDoS monitoring, organizations can reduce their exposure to attacks and keep websites, applications, and online services available to legitimate users.
1. Conduct Regular Vulnerability Assessments
The first step in preventing DDoS attacks is to check your systems for security weaknesses. Regular vulnerability assessments help you identify problems in your network, servers, applications, databases, and connected devices before attackers do.
These checks can uncover issues such as weak passwords, outdated software, incorrect settings, and login security problems. Once you identify these weaknesses, you can address the most important ones first. Regular assessments also help protect you from new security threats.
2. Strengthen Your Systems
System hardening means making your IT systems more secure by removing anything unnecessary. This reduces the number of ways attackers can target your systems.
You should remove unused software, close unnecessary ports, use strong passwords, install security updates quickly, and give employees only the access they need. Keeping systems updated and properly configured makes it much harder for attackers to exploit security weaknesses.
3. Secure Your DNS Infrastructure
DNS helps users reach websites, making it an important part of online services. As a result, attackers often target DNS in DDoS attacks.
To protect your DNS, restrict access to DNS servers, keep DNS software updated, and regularly review DNS settings and records. Using DNS security and DDoS protection tools can also help block harmful traffic before it impacts your services. A secure DNS system helps keep your website available, even during an attack.
4. Expand Network and Server Capacity
Having more network bandwidth and stronger servers helps your business handle large traffic volumes during a DDoS attack.
You can also distribute traffic across multiple servers, load balancers, or data centers. This improves performance and helps keep services running if one server becomes overloaded. While increasing capacity alone cannot stop DDoS attacks, it can reduce their impact when combined with other security measures.
5. Install Firewalls and Security Solutions
Firewalls help protect your network by controlling which traffic can enter or leave your systems.
You should also use Intrusion Detection and Prevention Systems (IDS/IPS) to monitor network activity and detect suspicious behavior. Antivirus software and endpoint security protect computers and devices from malware that attackers may use in DDoS attacks. Together, these security tools provide multiple layers of protection and help keep your services available for legitimate users.
6. Use Anti-DDoS Monitoring and Mitigation
Modern anti-DDoS solutions continuously monitor your network to detect unusual traffic that may indicate an attack.
When harmful traffic is detected, filtering and scrubbing tools remove malicious requests while letting real users access your services. Advanced DDoS protection uses smart traffic analysis and automatic responses to stop attacks quickly. Continuous monitoring and rapid mitigation help reduce downtime and keep your business running smoothly.
Other Useful Security Implements:
1. Data Encryption and How Does it Work
3. Enable Leech Protection in cPanel
4. Adaptive Core Security Suite
5. Detect DDoS Attacks Using Flow Analytics
DDoS attacks are a serious cybersecurity threat that can disrupt online services by flooding systems with malicious traffic. Understanding the different Types of DDoS Attacks and using strong security measures, such as monitoring, firewalls, and anti-DDoS protection, helps organizations reduce risk and maintain service availability.