Whether IP addresses to be added can overlap with existing IP addresses of other regions

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They can overlap with each other.
If an IP address to be added overlaps with an IP address of another user-defined or predefined region, the adding operation succeeds, and the overlapping IP address is automatically removed from this another predefined or user-defined region.

Other related questions:
Whether the undo add address command can delete preset IP addresses in predefined regions
The undo add address command cannot delete preset IP addresses in predefined regions. To override a preset IP address in a predefined region, add this IP address to another region if you know the region of the IP address or add the address to the region named "unknown-zone" if you do not know the region of the IP address.

An S series switch can successfully ping an IP address that does not exist
If an S series switch (a non-S1700 switch) can successfully ping an IP address that does not exist, there are reachable routes between the switch and the non-existent IP address. You can check the routing table or capture packets to locate the non-existent IP address. You need to analyze the reason why the switch can successfully ping the non-existent IP address and check whether such fault is related to the service configuration.

Can the virtual IP address of a VRRP group be added to the NAT address pool
Yes. If the virtual IP address of the VRRP group is the only public IP address for the intranet, you can add the virtual IP address to the NAT address pool.

Can an AR allocate existing static addresses to other terminals
If an IP address including the static address on the same network segment exists, the AR does not send the IP address to another terminal. Before assigning an IP address to a client, the DHCP server must ping the IP address to prevent address conflicts. After the dhcp server ping command is executed, the DHCP server can prevent repetitive IP address allocation. The DHCP server pings an IP address to be allocated. If there is no response to the ping packet within a certain period, the DHCP server continues to send ping packets to this IP address until the number of ping packets reaches the maximum value. If there is still no response, this IP address is not in use, and the DHCP server allocates the IP address to a client.

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