What product versions of Cloud DNS Intelligent Resolution are available?

　　Mainstream cloud DNS products on the market are typically tiered by feature level, including free, personal/professional, enterprise standard, and enterprise flagship (or premium) versions. The core differences between these versions are not price, but rather in four key dimensions: the accuracy of intelligent resolution, the time-to-live (TTL), the service availability guarantee (SLA), and security protection capabilities. These directly determine the stability of your business under different network environments and sudden traffic surges.

　　Free versions are usually positioned for trial or development testing environments and have many functional limitations. Regarding intelligent resolution capabilities, free versions only support the most basic carrier lines (such as China Unicom, China Telecom, and China Mobile) and country-level region determination. Furthermore, the DNS resolution nodes only cover a handful of locations in mainland China, resulting in high latency for overseas resolution. Its TTL (Time-to-Live) can only be set to a minimum of 600 seconds, meaning that changes to DNS records require a long wait for global changes to take effect, making it unsuitable for scenarios with frequent changes. In addition, free versions do not guarantee an availability SLA (Service Level Agreement), have daily resolution limits for a single domain, and completely lack built-in DNS attack protection capabilities.

　　The paid versions exhibit a clear "tiered" characteristic based on enterprise size and scenario needs. Taking the common version divisions of cloud vendors as an example, the entry-level Personal (or Professional) version is primarily designed for individual developers or small businesses. Its intelligent DNS resolution network expands to include more secondary carriers and continental levels compared to the free version, but it lacks fine-grained scheduling down to the province or city level. The TTL can be adjusted to a minimum of around 60 seconds, and it begins to offer 100% monthly availability SLA guarantees, which can meet the needs of basic websites or small projects.

　　The Enterprise Standard (if available) and Enterprise Flagship versions are where the true power of intelligent DNS is showcased. It's worth noting that, according to the product strategies of some cloud vendors, the Enterprise Standard version may have stopped accepting new purchases and exists only as a transitional version, with core functions concentrated in the Enterprise Flagship version. The biggest advantage of the Flagship version lies in the granularity of intelligent DNS resolution—it extends intelligent scheduling capabilities down to the province level within China and even the "province + carrier" level, while covering nearly a hundred countries and regions globally, and supporting custom lines (line division based on user IP address ranges). This enables precise traffic scheduling for gaming services, with Beijing Unicom users using Beijing Unicom nodes and Guangdong Telecom users using Guangdong Telecom nodes. In terms of performance, the flagship version supports a minimum TTL of 1 second, meaning near real-time activation speeds when urgent source IP switching or disaster recovery scheduling is needed. Furthermore, the flagship version often exclusively offers hourly backup of DNS records, auxiliary DNS, full defense against DNS attacks (defending against attacks with over 100 million queries per second), and dedicated one-on-one expert technical support, among other advanced operational capabilities.

　　In summary, the choice of version depends primarily on the business's need for "accuracy" and "stability." For personal blogs or test projects, the free or personal version is sufficient; however, for formal commercial services targeting users nationwide or even globally, especially for businesses like gaming and e-commerce with stringent requirements for scheduling accuracy and disaster recovery timeliness, the enterprise flagship version's 1-second TTL, province-level intelligent DNS resolution, and robust DNS security protection are the inevitable choice to ensure user experience and business continuity.