Understanding Denial of Service (DoS) Attack in Internet Networks

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Ngày cập nhật gần nhất: 15/4/2026

Denial of Service attack is a commonly encountered concept in the realms of security and network safety. It presents as a relatively straightforward attack, yet the measures to thwart it are considerably intricate. Mytour aims to provide you with detailed insights into DoS attacks on the Internet network.

DoS (Denial of Service) is an attack aimed at disrupting the services of a website or a system through various means. Perpetrators of this attack endeavor to hinder users from accessing information or resources from any service or website by inducing system disruptions, overloads, or delays.

One of the most prevalent methods of DoS attacks involves overloading the system by inundating it with a multitude of virtual clients accessing concurrently. Consequently, accessing the service would be disrupted as the server struggles to process your requests. Similarly, through this mechanism, attackers can flood your email with a barrage of spam until it reaches the threshold of each mail service, potentially inundating and rendering your email incapable of receiving further emails.

What is DDOS?

DDOS (Distributed Denial of Service) - Distributed Denial of Service attack - is a prevalent form of DOS attack due to its extensive impact and scope. By some means, hackers seize control of your entire system to become a part of the attack toolset. Your computer becomes a part of a BOTNET (zombie computer network) to carry out attacks on services such as banking, spam email sending, server memory overflow attacks...

Due to the simultaneous use of multiple computers, this is referred to as a distributed denial of service attack.

Distinguishing DOS and DDOS

There are numerous indicators that might lead you to conclude it's the aftermath of a DOS or DDOS attack; however, not all system disruptions are attributable to such assaults. Consider the following signs to spot DOS and DDOS:

- Slow network access unrelated to network infrastructure

- Inability to access certain websites

- Unusual surge in spam emails

Preventing DOS and DDOS Attacks

For system administrators

Enhance system security by utilizing hardware and software security technologies, maintain firewall operations.

For public directories under DDOS attack with continuous requests, consider creating a .htaccess file with the following content:

Simultaneously create a file called antiddos.phtml with the following content:

For average users

Maintain information security by avoiding malware through various methods:

- Install and regularly update security software, antivirus programs

- Actively use email filters to avoid spam emails

- Install and maintain firewalls on each computer, limit access traffic.

- Avoid providing personal emails excessively on the Internet

The above are basic knowledge about Denial of Service (DOS) attacks. Precautions include keeping security knowledge up to date, protecting oneself from information security risks, promptly updating hardware and software technologies to combat DDOS for systems. Additionally, regularly review and manually remove trojans while updating antivirus software to protect computers.

Currently, there is a plethora of antivirus software available for around-the-clock protection, such as Bkav, Kis, Avas... Users can choose and download antivirus software based on their computer configuration to safeguard their machines.

Frequently Asked Questions

What is the primary purpose of a Denial of Service attack?

The primary purpose of a Denial of Service (DoS) attack is to disrupt the services of a website or system, preventing users from accessing information or resources. This disruption can occur through various methods, including overwhelming the system with requests.

How can one differentiate between DoS and DDoS attacks?

To differentiate between DoS and DDoS attacks, observe the scale and source of the attack. A DoS attack originates from a single source, while a DDoS attack involves multiple compromised systems, collectively overwhelming the target, making it more challenging to mitigate.

What are some common signs of a DoS or DDoS attack?

Common signs of a DoS or DDoS attack include slow network access unrelated to infrastructure issues, an inability to access specific websites, and a sudden increase in spam emails, indicating potential system disruption.

What measures can be taken to prevent DoS and DDoS attacks?

To prevent DoS and DDoS attacks, system administrators should enhance security through hardware and software solutions, maintain firewall operations, and implement rate limiting. Users should also install antivirus software and limit personal information shared online.

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