CDN Necessary for Efficient Delivery of Diversified Content
Multi-Layer Deep Defense System Protects Against Attack Traffic

"As the internet environment changes, enterprises need to adopt CDN (Content Delivery Network)," said Seokin Yoon, Technical Director of Limelight Networks Korea, at a press briefing held on the 8th at Finance Center in Jung-gu, Seoul, on the topic of "CDN Technology Trends and Technology Strategy."

As online business shifts from text-centric to multimedia, complexity is increasing due to diverse access devices, various file types being transmitted, connection speeds, and delivery methods. In particular, to provide high-quality content delivery services, factors such as object size of transmitted content, library size, number of users, and object popularity must be considered.

CDN is a service that stores and distributes data on distributed servers to efficiently deliver content in internet usage environments. Limelight is a QoS-enabled network configured globally, operates more than 80 POPs (Points-of-Presence), and operates more than 22 nodes equipped with 1 terabit per second transmission capacity (Tbps egress capacity), directly connected to major ISPs and last-mile networks.

Director Yoon stated, "By utilizing CDN, not only can web content delivery be accelerated, but improved end-user experience can be provided," and emphasized, "IT infrastructure investment costs can be reduced, flexible scalability can be provided even during traffic spikes, and content security can be enhanced."

Enterprises can store large-capacity content in Limelight's cloud storage, "Origin Storage," instead of storing it in headquarters storage, and transmit it quickly from each node. Origin Storage stores content originals in data centers, so there is minimal risk of data loss.

Limelight's cloud security employs a multi-layer deep defense system to absorb attack traffic based on large-scale network and server capacity. A DDoS defense system is also equipped. Additionally, web application firewall, bot manager, malware defense, API defense, and other measures block malicious attacks and unauthorized content access.

Web Application Firewall (WAF) Express supports IP address rate limiting and basic OWASP 10 WAF filtering rules from a single IP address, providing Security Alert functionality and additional security features. The WAF is integrated with Limelight's global CDN to provide a secure distributed architecture that protects web applications cost-effectively without performance degradation due to security, and detects and defends against attacks on the network edge in real-time.

Director Yoon stated, "Traffic detected as DDoS attacks is filtered through machine learning and AI at the Global Scrubbing Center and then transmitted. There are five Global Scrubbing Centers worldwide, and a POP is planned to be established in Korea by 2018," and explained, "Attacks not detected by DDoS equipment are detected by deploying WAF between the CDN and the customer's origin."