The word DDoS attack is often heard on the internet today. Due to DDoS attack, many sites are down, many systems have crashed. Various services have been shut down through DDoS Attack. Almost all of us have heard the name DDoS Attack, we have seen the damage caused by it. But very few people have an idea, what is DDoS?
The term DDos is actually a shortened form of a long line. The full form is Distributed Denial of Service.
If we want to know about DDoS, we need to know about DOS attack first.Here DOS does not mean Disk Operating System, it means Denial of Service. Simply put, when a service is forced to refrain from providing service, it is a denial of service. But it’s not as easy as it sounds.
Suppose there is a window on the east side of your house. When that window is open, sunlight enters the house in the morning.You want to keep the window open every morning so that sunlight enters your room. Now a few naughty boys from the house next door are constantly throwing stones inside your house through the open window.As soon as you open the window, they throw stones. At one point you are forced to close the window. Now you can not open the window even if you want to. As a result, light is not entering your room properly.
This is the case with Denial of Service Attack. Suppose you have a website where parents of students at your school can view their children’s test results. Now some failed students have decided that they will not allow their parents to enter this site. So they started DOS attacking your site.
Suppose your website’s server is connected with a 10 megabit connection. As a result, the server connection has the ability to upload and download ten megabytes of data per second. Now those failed students started sending a lot of traffic to your server using a 20 megabit connection. Millions of requests are coming every second, their replies are going. Since students have higher connection speeds, they are sending 20 megabits of traffic per second to your server. But your server’s connection speed is only 10 megabits. As a result, the whole connection is blocked, there is no other way to get the data. The entire 10 megabytes are being used to handle the traffic sent by the students.
This is the basic idea of DOS attack. Excessive traffic puts a server under such pressure that its entire connection is blocked from handling that traffic. As a result, the real customers of this server, the parents of the students, are no longer able to log in, can not see the results of the children. As a result, they are being deprived of the services they deserve. This is Denial Of Service.
[Kids, don’t try to do anything wrong by reading this, the connection to the school / college server is much stronger than your home connection, nothing will work, study if you are worried about the result]
Now, what is DDoS?
What is DDoS Attack?
Let’s rethink the previous incident. Modern servers do not run at such low speeds. They usually use gigabit connections. Good hosting companies use better connections.Even if you attack all day with a 20 megabyte connection from your home, these servers will not be harmed. Server connection (assume) 1024 MB, there your 20 MB will not do any harm to any server.
But, what if 100 people attack together from a 20 megabit connection? Now think about the level of attack. A typical hosting company will struggle to handle an attack of this size.That’s the basic idea of DDoS. DDoS stands for distributed denial-of-service.In other words, the attack is carried out by a few people instead of one. When attacks are carried out using millions of computers, even large servers lose their rhythm.
But you may ask, why would 10 more people join your attack? Why would they want to attack DDos from their own connection? Because, in 99% of cases, the users themselves do not know that they have been involved in a DDos attack. How?
Notice the picture above. A diagram of the DDos attack is shown. The DDos attack depends on many computers, those computers are called zombie computers. Horror movie zombies are being talked about here. These computers are infected with any kind of Trojan or malware. In most cases the user himself is unaware that his computer is infected with a Trojan. The real attacker sends a request to all these Trojans, with instructions on where to attack and when or for how long. As soon as the request is received, these zombies start attacking the computer. The more Trojan infected computers, the higher the level of attack. When thousands of innocent computers are sending thousands of megabits of traffic to a server, it is natural that the condition of any server will deteriorate.
In 2015, there was a DDoS attack on the BBC’s website, at a speed of 602 gigabytes per second. In March 2013, a 120 GB DDoS attack was launched against spamhaus.org, a four-hour attack that severely weakened Europe’s Internet system.Also the github has been the victim of DDoS attack in 2018.
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