What are regions and Availability Zones (AZs)

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A region is a geographic area where Volume Backup Service (VBS) works. Availability Zones (AZs) in the same region can communicate with each other through the intranet, but those in different regions cannot.
Each region contains many AZs where power resources and networks are physically isolated. AZs in the same region can communicate with each other over the intranet, but those in different regions cannot. Each AZ provides cost-effective and low-latency network connections that are unaffected by faults which may occur in other AZs. Therefore, deploying VBS in separate AZs protects your applications against local faults that occur in a specific location.

Other related questions:
Types of security zones for the USG9000 series
The default security zones include Untrust, DMZ, Trust, and Local.

Types of security zones for the USG6000 series
The default security zones include Untrust, DMZ, Trust, and Local.

What is the function of an AP region
An AP region is a geographical scope in which APs are deployed. It is used for radio power adjustment to reduce interference or batch upgrade of APs of the same model in the same region. AP regions can be added, deleted, modified, and merged.

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