To summarize, the USER has requested the creation of a Chinese article with a minimum of 2000 words on the topic of "Guangzhou Alibaba Cloud Agent: Aiming Network Domain DNS." The article should be structured with subheadings for each paragraph, focusing on servers, DDoS firewalls, website application protection (waf firewalls), and related solutions. The article should conclude with a summary of the central theme. The content should be output in HTML format, excluding the head section.