The "prevention and control circle" in the site planning principle refers to enclosing the target area to form a comprehensively closed prevention and control system. For example, prevention and control circles can be constructed in areas such as inter-city junctions, entrances and exits.

In the IVS3800 management node cluster deployment scenario, which of the following statements are correct? (Multiple choice)

During video backup between platforms, the configuration server backup download speed is extremely fast, for example, the video is backed up at 1 time, 2 times, 4 times and 8 times the speed of the camera code. Which of the following types supports setting 2 times speed backup? (Multiple choice)

The subsystems of the data center infrastructure include (). (Multiple Choice)

The central cloud platform uses hierarchical storage technology, which is characterized by combining storage media (HD, SSD) to store the most frequently used and most intensive data (such as high-frequency access snapshots) on high-performance disks. The historical data (such as historical video) with reduced access frequency is transferred to a storage medium with a larger capacity and a lower cost.