If you use Sync with PC clock or Manually, the time will be restore to the default time, it's a normal thing. If you do not want this to happen, it is recommended to use the SNTP function of the...

I think you may want to develop a Multicast network application network. IGMP Snooping and IGMP Querier can help you to solve your problem.

Video is not a goog method to showing the configuration of a managed switch, the UG will help you much.

Sorry to hear that, but you can reconfig it via the Cosole Port.