As the Importance of Speed and Security Grows, Countermeasures Are Needed
CDN Without Server Downtime Emerges as a Remedy in the Network Security Era

CDN (Contents Delivery Network), which prevents cloud server downtime and manages cloud efficiently at cost-effective rates, is emerging as an essential element in the era of network security.

This phenomenon has garnered increased attention recently as seven commercial banks were attacked with DDoS strikes accompanied by threatening emails. This is because, as attacks target not only servers but also network equipment and available network bandwidth, the cloud environment is also being pointed out as a blind spot in security.

DDoS attacks have become more diverse, with data breach attempts such as SQL injection and XSS occurring, making hacking defense increasingly difficult. At the KT Cloud Frontier held on the 20th, numerous CDN-related companies participated and discussions took place regarding the current cloud environment and security.

Ahn Jun-soo, Executive Director of Akamai, presented on the topic "Innovation Led by IoT, Is Cloud Enough?" To prevent cloud attacks, large capacity reserves are necessary since immediate scaling is difficult. However, securing cloud capacity entails significant costs. For this reason, CDN has been widely used for large-file downloads such as online games, music downloads, and software updates.

Akamai introduced a customer case in which a gaming company applied a cloud-based security solution to handle multiple DDoS attack traffic exceeding 100-300Gbps without building additional infrastructure.

Key features include ▲minimizing origin load to protect core infrastructure, ▲reducing origin traffic costs and supporting service continuity through distribution/bypass technology even when the origin experiences failure, and ▲rapidly creating origin servers/storage on CDN and managing them in an integrated manner.



Lee Jung-hun, Division Chief of Sollbox, stated, "Using a distributed platform to analyze whether traffic is an attack or legitimate, we detect and defend against attacks before they reach the origin server. Since servers with issues are transferred to neighboring servers for operation, theoretically there is no server downtime."

Additionally, by caching popular content on each server, storage can be used up to several petabytes without interrupting service. Investment costs can be reduced compared to cloud. When cloud and CDN work as complements rather than alternatives, flexible and efficient large-capacity storage can be secured.

Besides, CDN security types include various forms such as providing volatile URLs (1time URL).