4.3 Node operation methods

CDN nodes deliver content by receiving requests from clients and forwarding them to the optimal cache server. The node selects the optimal cache server by considering the client's physical location, the type of content, and the state of network traffic. The following are the main operations performed by CDN nodes:

• Request reception: The node receives requests sent by clients. The request includes the type of content, its size, and the client's physical location.

• Cache server selection: Based on the received request, the node selects the optimal cache server. The selection criteria varies based on the client's physical location, the type of content, and the state of network traffic.

• Forwarding to cache server: The node forwards the request to the selected cache server. The transfer is made through the network between the node and the cache server.

• Responding: When the cache server provides the content, the node responds to the client with that content. The response includes the type of content, its size, and the client's physical location.

CDN nodes need to handle a massive amount of traffic. Therefore, it is essential to adopt fast and efficient algorithms. Also, nodes need to be mindful of security. Security measures such as verifying the origin of requests are necessary.