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Cyber Security Degrees

DoS Attack Types and What is the Denial of Service Attack in Hacking?

Hackers attempt to prevent legitimate users from accessing a certain type of service by launching a denial-of-service (DoS) attack. A DoS attack involves sending messages to the network or server asking them to authenticate requests with false return addresses.

While sending authentication approval, the server or network won’t find the return address of an attacker. It will cause the server and network to hold the connection until it is closed. The hackers will send additional authentication messages to the server that contain false return addresses every time it closes the connection.

The server will wait for authentication to begin over again. This will keep the network or server busy. This article will discuss the denial-of-service attack in hacking, how it can occur and how to avoid it.

What is DoS Attack?

There are many ways that a DoS attack could occur. is the most common type of DoS attack.

  • Distracting the information state, such as resetting TCP sessions.
  • Do not interrupt service for an individual or a system.
  • A person is prevented from accessing a service.
  • Interfere with the connections between different machines and stop accessing a specific service.
  • To prevent legitimate network traffic, overload the network or server.

Another type of DoS is the smurf attack. This is a type of DoS that involves sending thousands of emails to multiple people with false return email addresses to an organization. The initial messages can be sent to more than one person and then sent to a false address.

A false email address can cause an account to be hacked.

DoS Attacks: Denial of Service

DoS attacks can lead to many problems, including:

  • Connection Interference
  • Network traffic interruption
  • Inaccessible services
  • Inefficient services

Types of DOS

There are many types of DoS attacks.

Volumetric Attacks

This is a type of attack where the entire bandwidth of a network is consumed and clients are denied access to those resources. This is done by overloading network devices such as switches and hubs with many reply packets/ICMP echo requests so that the entire network bandwidth is used up. No other users can connect to the network.

Flooding in the SYN

A hacker continuously floods targets with SYN packets. These SYN packets will weigh down all targets. They can be reduced or increased in performance.

Fragmentation Attacks

This attack is designed to impede the target’s ability to reassemble itself. The target receives several fragmented packets, making it difficult for them to reassemble them all. Legit clients are denied access.

TCP-State Exhaustion Attack

This attack involves the hacker destroying and setting up TCP connections, and weighing down the stable tables. This causes a DoS attack.

Application Layer Attacks

Hackers can exploit programming mistakes in applications to cause a DoS attack. This can be accomplished by sending multiple requests to the target to exhaust all resources and make them unavailable to legit clients.

This is where a programming error may buffer an overflow attack. If the memory allocated for a particular variable is smaller than requested, it could lead to memory leakage or application crash.


This attack causes permanent damage to the hardware by sending false updates to it and rendering it unusable. Reinstalling the hardware is the only way to repair it.

How to Prevent DoS Attacks

DoS attack prevention is a must-read for anyone who runs an online business.

You can quickly recover damage from an attack if you recognize it early. Here are some ways to avoid DoS attacks.

Get Help recognizing attacks

To protect their websites, most companies use technology or Anti-DoS services. This can be used to distinguish between DDoS attacks or legitimate spikes in network traffic.

Blackhole routing: Investigate

Blackhole routing is used by service providers to divert traffic to a null route. This is also known as a black hole. This can be used to stop the targeted website or network from going down.


You now have a better understanding of DDoS attacks and can take the steps outlined above to protect your site from them.