What's troublesome with DDoS attacks is that the measure is extremely difficult. For example, if it is a cyber attack trying to intrude to a Web site, it is possible to take measures by detecting abnormal communication different from ordinary access, or by blocking access from the specified attack source . However, since DDoS attack sends a large amount of data to the server with normal communication, it cannot be distinguished from normal communication. Also, as there are many attackers, it is difficult to list all of them and block access.
Even if some measure is taken on the server side, there is a problem that the line connecting to the Internet becomes clogged. If a large amount of packets are sent by DDoS attacks, which consumes the bandwidth of the Internet access line, legitimate users will also be unable to access the website. In other words, even if you do not damage the server, if you can clog the line with a lot of communication, the DDoS attack will succeed.
This is a service called CDN (Contents Delivery Network) that is taking the spotlight to DDoS protection of websites which are difficult to deal with in this way. This is a service that distributes the contents of the Web site using the cache server placed all over the world and was originally used for the purpose of improving the response of the Web site.
In the CDN service, we utilize our own cache server and its associated network to deliver customer content to users all over the world.
CDN taking the spotlight as a measure against DDoS attack:
So why is CDN effective as a measure against DDoS attacks? When receiving a DDoS attack, data is sent from computers around the world that are manipulated by the attacker. However, if you are using CDN, the connection destination becomes a cache server, and the impact on the Web server and Internet connection line operated by your company can be kept to a minimum. This also allows access to legitimate users' websites, which will avoid the damage of DDoS attacks.
It can also be expected to greatly reduce the operational load on the website. If you use CDN, it responds to user access from a cache server all over the world, so you can respond to access from a large number of users without allocating large resources to your web server It will be possible. If this reduces the number of servers, you can reduce the operational load. Moreover, since bandwidth of Internet connection line can be saved, it is possible to optimize the operation cost of Web server.
You can strengthen the security measures on the Web server, and you can improve the response by using a cache server deployed around the world. If you use it as a global web platform, it is also worth looking at aggregating the Web servers that were operated individually in each country and realizing cost optimization.
In this way, CDN brings various benefits to the operation of the website. CDN will be an effective solution if you have the problem that you want to eliminate the concern of DDoS attacks or the burden of Web server operation is burdensome.