1. The analytical results of the system query are analyzed by the sample DNS of each region, and it is not the real analytic situation of the whole region. The analytical results are only for reference and do not have the function of fault evidence.
2. The abnormal operation of sample DNS results in the deviation of the analytical results from the actual CDN.
3. Sample DNS is the operation of the various regions of the operation of the cache DNS, not my division operations, so I can not put an end to the sample DNS failure.