What is Denial-of-Service Attack and How to Prevent it?

Denial of Service Attack

A denial-of-service (DoS) attack attempts to make a machine or network resource unavailable to its intended users. A DoS attack can be launched from anywhere globally and can target any device or service, including websites, email servers, and video streaming services.

There are many different DoS attacks, but the most common type is the Distributed Denial of Service (DDoS) attack. In a DDoS attack, the attacker uses multiple devices to flood the target with traffic. This traffic can come from worldwide and can be difficult for the target’s servers to handle. As a result, the target’s resources become overwhelmed and unavailable to legitimate users.

There are several ways to protect your devices and networks against DoS attacks. The most crucial step is to install security updates as soon as they are released.

How do you know if you are targeted in DDoS Attack?

A denial-of-service attack is an attack against an online or networked system, for example, an Internet-connected server, which denies the system any service for some time. The victim of a DoS attack will become aware of the issue either through a sudden interruption in service or by a message stating that the system is being blocked. In extreme cases, the message will show that a device connected to the network has been brought offline.

Because a DoS attacker does not need to access an organisation’s server to attack it, Web sites are particularly vulnerable to DoS attacks. The Web sites for Microsoft, eBay, Amazon.com, and many other companies have been victims of DoS attacks that resulted in service interruptions to their customers.

As you know, a Web browser loads a Web page by sending a message to a Web server that requests the page. The Web server responds with a message that contains the HTML content of the WebHTMLe, along with an image or other files required to display the Web page in the browser. When a Web browser is used in a DoS attack, it sends thousands of page requests per minute to the Web server with the goal of overloading the server.

In some cases, each of the page request messages has a false return address, so the Web server consumes processing resources in an attempt to solve the problem. As more page requests arrive at the Web browser, and efforts to solve the problem and process the new requests accumulate, the server becomes overloaded and unavailable to process legitimate requests. Ultimately, the server shuts down.

In a distributed denial-of-service (DDoS) attack, the attacker takes control of one or more computers without the owner’s permission and uses those computers to launch a DoS attack on other computers, servers, or networks. Most DDoS attacks are initiated after the attacking computers are infected with Trojan horse programs. Each Trojan horse program is coded to open and launch a DoS attack on the same date and time.

Is there anything you can do to protect yourself from an attack?

As with any form of attack, the best defence against DoS attacks is to be appropriately protected from such attacks in the first place. To protect against these types of attacks, servers require some form of protection. The basic level of security is to monitor them with a monitoring tool to look for any unusual traffic.

Although this is the basic level of protection required by servers, such tools often report issues even if the attack is a DoS attack. However, once the attack has started, it is often too late to block it, and if the server was to go offline, services on the server might be affected.


Every second there are several million attacks against websites. A DDOS attack is one of the most serious and widespread attacks against a website. A DDOS attack affects many people as it can also affect the stability of a business. However, no matter how much the attacker spends on the attack, his effort is not successful due to the security of websites.

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