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In this lesson, we will talk about those and those attacks, so don't stand for denial of service attack

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and those stands for distributed denial of service attack.

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Now, what is those attack dogs means creating a fake traffic, a huge amount of fake traffic on your

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target so that your target will unable to handle that much of traffic and will crash.

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So to make resources unavailable.

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Is the main aim of those attack right?

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Now, your target could be anything, a normal computer, a server or a Web site, so let's understand

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both doors and the doors one by one.

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So here is the scenario of DOS attack or denial of service attack.

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So this is the attacker machine.

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And in this type of attack and attacker can directly use his own machine to perform DOS attack on the

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target.

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But he will also hack a new computer and a non PC and will use that PC as an attacker machine to perform

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the DOS attack on the target so that whenever investigation is conducted, the security experts will

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assume that this is the attacker machine and this one is the real criminal.

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So to protect ourselves, the attackers would do these kind of attacks, right?

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They will hack on another machine and then use that machine to perform attack on the target.

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Right.

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But to protect ourselves from these kind of attacks, security experts will use more than one server.

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Right.

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Suppose your target is in Web site.

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So experts will look close to that website on more than one server so that whenever traffic increases,

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they will divide the traffic on all of their servers.

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Right.

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They are using load balancers to help protect from those attacks.

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Right now, those attack is used normally to take down small targets.

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OK, but if your target is big, like your target is Wikipedia, then those attacks will not work on

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that Web site.

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OK, so you have to go for distributed denial of service attack.

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Right.

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Which is dos in this did not attack.

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A group of hackers will come together to take down a big target.

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Right.

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So suppose this is hacker A, this is hacker B and this is hacker C, so a single hacker would hack

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some other machines.

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Right, like this.

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And then they all come together and will use all of these machines, OK, to take down a big target,

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right?

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So this is the minimum scenario because in real world, a single hacker would hack 10, 20 or even more

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machines.

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So a single hacker may use 20 machines, then a group of hackers, let's say 50 or 100, OK, then multiply

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them by 20 so that much of machines come together or used together to take down a big target.

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Now, recently, if you heard the news in September 2019, Wikipedia has faced DOS attack and is unavailable

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in some of the countries.

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Right.

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So did us attack once it started?

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Cannot be stopped easily.

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Right.

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You can't stop the attack by using your balancers or by blocking the IP address.

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OK, but you can use these kind of security in DOS attack, right?

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So they don't attack is a very harmful attack.

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And both those and those attacks are illegal in approximately all of the countries.

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So be aware before using these kind of attacks on real target until and unless you have the full permission

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to do so.

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Right.