Versions of NTP supported by S series switches

S series switches support NTPv1, NTPv2, NTPv3, and NTPv4. NTPv4 applies to both IPv4 and IPv6 networks.
The NTP version does not need to be configured on the NTP server and the packet version depends on that of packets sent by a client:
If a client sends a packet in version 3, the server replies with a packet in version 3.
If a client sends a packet in version 4, the server replies with a packet in version 4.

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