Intelligent Resolution Overview

Typically, a DNS server returns the same resolution result to visitors from different networks or geographic locations. However, in case of cross-network or cross-region access, this would lead to long latency and poor user experience.

With configurable resolution lines, you can specify that the DNS server return different resolution results for the same domain name based on the networks or geographic locations of visitors' IP addresses.

In addition to ISP and region lines, the DNS service allows you to define resolution lines based on IP address ranges to route visitors to different web servers.

For a website deployed on multiple servers, you can set different weights for the record sets to balance the loads of these servers.

Table 1 describes the scenarios and operations for configuring resolution lines.

**Table 1** Resolution lines
Operation	Scenario	Constraints
Configuring ISP Lines for Record Sets	Configure ISP lines to distinguish visitors by carrier.	Resolution lines can be configured only for public zones.
Configuring Region Lines for Record Sets	Configure region lines to distinguish visitors by geographic location.	Resolution lines can be configured only for public zones.
Configuring Custom Lines	Configure custom lines to distinguish visitors by IP address range.	Resolution lines can be configured only for public zones.
Configuring Weighted Resolution	Configure weight-based resolution for load balancing based on the proportion of requests to each record set.	Resolution lines can be configured only for public zones.